1 #ifndef _LINUX_SCHED_H
2 #define _LINUX_SCHED_H
3
4 #include <uapi/linux/sched.h>
5
6 #include <linux/sched/prio.h>
7
8
9 struct sched_param {
10 int sched_priority;
11 };
12
13 #include <asm/param.h> /* for HZ */
14
15 #include <linux/capability.h>
16 #include <linux/threads.h>
17 #include <linux/kernel.h>
18 #include <linux/types.h>
19 #include <linux/timex.h>
20 #include <linux/jiffies.h>
21 #include <linux/plist.h>
22 #include <linux/rbtree.h>
23 #include <linux/thread_info.h>
24 #include <linux/cpumask.h>
25 #include <linux/errno.h>
26 #include <linux/nodemask.h>
27 #include <linux/mm_types.h>
28 #include <linux/preempt_mask.h>
29
30 #include <asm/page.h>
31 #include <asm/ptrace.h>
32 #include <linux/cputime.h>
33
34 #include <linux/smp.h>
35 #include <linux/sem.h>
36 #include <linux/shm.h>
37 #include <linux/signal.h>
38 #include <linux/compiler.h>
39 #include <linux/completion.h>
40 #include <linux/pid.h>
41 #include <linux/percpu.h>
42 #include <linux/topology.h>
43 #include <linux/proportions.h>
44 #include <linux/seccomp.h>
45 #include <linux/rcupdate.h>
46 #include <linux/rculist.h>
47 #include <linux/rtmutex.h>
48
49 #include <linux/time.h>
50 #include <linux/param.h>
51 #include <linux/resource.h>
52 #include <linux/timer.h>
53 #include <linux/hrtimer.h>
54 #include <linux/task_io_accounting.h>
55 #include <linux/latencytop.h>
56 #include <linux/cred.h>
57 #include <linux/llist.h>
58 #include <linux/uidgid.h>
59 #include <linux/gfp.h>
60 #include <linux/magic.h>
61
62 #include <asm/processor.h>
63
64 #define SCHED_ATTR_SIZE_VER0 48 /* sizeof first published struct */
65
66 /*
67 * Extended scheduling parameters data structure.
68 *
69 * This is needed because the original struct sched_param can not be
70 * altered without introducing ABI issues with legacy applications
71 * (e.g., in sched_getparam()).
72 *
73 * However, the possibility of specifying more than just a priority for
74 * the tasks may be useful for a wide variety of application fields, e.g.,
75 * multimedia, streaming, automation and control, and many others.
76 *
77 * This variant (sched_attr) is meant at describing a so-called
78 * sporadic time-constrained task. In such model a task is specified by:
79 * - the activation period or minimum instance inter-arrival time;
80 * - the maximum (or average, depending on the actual scheduling
81 * discipline) computation time of all instances, a.k.a. runtime;
82 * - the deadline (relative to the actual activation time) of each
83 * instance.
84 * Very briefly, a periodic (sporadic) task asks for the execution of
85 * some specific computation --which is typically called an instance--
86 * (at most) every period. Moreover, each instance typically lasts no more
87 * than the runtime and must be completed by time instant t equal to
88 * the instance activation time + the deadline.
89 *
90 * This is reflected by the actual fields of the sched_attr structure:
91 *
92 * @size size of the structure, for fwd/bwd compat.
93 *
94 * @sched_policy task's scheduling policy
95 * @sched_flags for customizing the scheduler behaviour
96 * @sched_nice task's nice value (SCHED_NORMAL/BATCH)
97 * @sched_priority task's static priority (SCHED_FIFO/RR)
98 * @sched_deadline representative of the task's deadline
99 * @sched_runtime representative of the task's runtime
100 * @sched_period representative of the task's period
101 *
102 * Given this task model, there are a multiplicity of scheduling algorithms
103 * and policies, that can be used to ensure all the tasks will make their
104 * timing constraints.
105 *
106 * As of now, the SCHED_DEADLINE policy (sched_dl scheduling class) is the
107 * only user of this new interface. More information about the algorithm
108 * available in the scheduling class file or in Documentation/.
109 */
110 struct sched_attr {
111 u32 size;
112
113 u32 sched_policy;
114 u64 sched_flags;
115
116 /* SCHED_NORMAL, SCHED_BATCH */
117 s32 sched_nice;
118
119 /* SCHED_FIFO, SCHED_RR */
120 u32 sched_priority;
121
122 /* SCHED_DEADLINE */
123 u64 sched_runtime;
124 u64 sched_deadline;
125 u64 sched_period;
126 };
127
128 struct futex_pi_state;
129 struct robust_list_head;
130 struct bio_list;
131 struct fs_struct;
132 struct perf_event_context;
133 struct blk_plug;
134 struct filename;
135
136 #define VMACACHE_BITS 2
137 #define VMACACHE_SIZE (1U << VMACACHE_BITS)
138 #define VMACACHE_MASK (VMACACHE_SIZE - 1)
139
140 /*
141 * These are the constant used to fake the fixed-point load-average
142 * counting. Some notes:
143 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
144 * a load-average precision of 10 bits integer + 11 bits fractional
145 * - if you want to count load-averages more often, you need more
146 * precision, or rounding will get you. With 2-second counting freq,
147 * the EXP_n values would be 1981, 2034 and 2043 if still using only
148 * 11 bit fractions.
149 */
150 extern unsigned long avenrun[]; /* Load averages */
151 extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
152
153 #define FSHIFT 11 /* nr of bits of precision */
154 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
155 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
156 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
157 #define EXP_5 2014 /* 1/exp(5sec/5min) */
158 #define EXP_15 2037 /* 1/exp(5sec/15min) */
159
160 #define CALC_LOAD(load,exp,n) \
161 load *= exp; \
162 load += n*(FIXED_1-exp); \
163 load >>= FSHIFT;
164
165 extern unsigned long total_forks;
166 extern int nr_threads;
167 DECLARE_PER_CPU(unsigned long, process_counts);
168 extern int nr_processes(void);
169 extern unsigned long nr_running(void);
170 extern bool single_task_running(void);
171 extern unsigned long nr_iowait(void);
172 extern unsigned long nr_iowait_cpu(int cpu);
173 extern void get_iowait_load(unsigned long *nr_waiters, unsigned long *load);
174
175 extern void calc_global_load(unsigned long ticks);
176 extern void update_cpu_load_nohz(void);
177
178 extern unsigned long get_parent_ip(unsigned long addr);
179
180 extern void dump_cpu_task(int cpu);
181
182 struct seq_file;
183 struct cfs_rq;
184 struct task_group;
185 #ifdef CONFIG_SCHED_DEBUG
186 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
187 extern void proc_sched_set_task(struct task_struct *p);
188 extern void
189 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
190 #endif
191
192 /*
193 * Task state bitmask. NOTE! These bits are also
194 * encoded in fs/proc/array.c: get_task_state().
195 *
196 * We have two separate sets of flags: task->state
197 * is about runnability, while task->exit_state are
198 * about the task exiting. Confusing, but this way
199 * modifying one set can't modify the other one by
200 * mistake.
201 */
202 #define TASK_RUNNING 0
203 #define TASK_INTERRUPTIBLE 1
204 #define TASK_UNINTERRUPTIBLE 2
205 #define __TASK_STOPPED 4
206 #define __TASK_TRACED 8
207 /* in tsk->exit_state */
208 #define EXIT_DEAD 16
209 #define EXIT_ZOMBIE 32
210 #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD)
211 /* in tsk->state again */
212 #define TASK_DEAD 64
213 #define TASK_WAKEKILL 128
214 #define TASK_WAKING 256
215 #define TASK_PARKED 512
216 #define TASK_STATE_MAX 1024
217
218 #define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWP"
219
220 extern char ___assert_task_state[1 - 2*!!(
221 sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
222
223 /* Convenience macros for the sake of set_task_state */
224 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
225 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
226 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
227
228 /* Convenience macros for the sake of wake_up */
229 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
230 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
231
232 /* get_task_state() */
233 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
234 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
235 __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD)
236
237 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
238 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
239 #define task_is_stopped_or_traced(task) \
240 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
241 #define task_contributes_to_load(task) \
242 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
243 (task->flags & PF_FROZEN) == 0)
244
245 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
246
247 #define __set_task_state(tsk, state_value) \
248 do { \
249 (tsk)->task_state_change = _THIS_IP_; \
250 (tsk)->state = (state_value); \
251 } while (0)
252 #define set_task_state(tsk, state_value) \
253 do { \
254 (tsk)->task_state_change = _THIS_IP_; \
255 set_mb((tsk)->state, (state_value)); \
256 } while (0)
257
258 /*
259 * set_current_state() includes a barrier so that the write of current->state
260 * is correctly serialised wrt the caller's subsequent test of whether to
261 * actually sleep:
262 *
263 * set_current_state(TASK_UNINTERRUPTIBLE);
264 * if (do_i_need_to_sleep())
265 * schedule();
266 *
267 * If the caller does not need such serialisation then use __set_current_state()
268 */
269 #define __set_current_state(state_value) \
270 do { \
271 current->task_state_change = _THIS_IP_; \
272 current->state = (state_value); \
273 } while (0)
274 #define set_current_state(state_value) \
275 do { \
276 current->task_state_change = _THIS_IP_; \
277 set_mb(current->state, (state_value)); \
278 } while (0)
279
280 #else
281
282 #define __set_task_state(tsk, state_value) \
283 do { (tsk)->state = (state_value); } while (0)
284 #define set_task_state(tsk, state_value) \
285 set_mb((tsk)->state, (state_value))
286
287 /*
288 * set_current_state() includes a barrier so that the write of current->state
289 * is correctly serialised wrt the caller's subsequent test of whether to
290 * actually sleep:
291 *
292 * set_current_state(TASK_UNINTERRUPTIBLE);
293 * if (do_i_need_to_sleep())
294 * schedule();
295 *
296 * If the caller does not need such serialisation then use __set_current_state()
297 */
298 #define __set_current_state(state_value) \
299 do { current->state = (state_value); } while (0)
300 #define set_current_state(state_value) \
301 set_mb(current->state, (state_value))
302
303 #endif
304
305 /* Task command name length */
306 #define TASK_COMM_LEN 16
307
308 #include <linux/spinlock.h>
309
310 /*
311 * This serializes "schedule()" and also protects
312 * the run-queue from deletions/modifications (but
313 * _adding_ to the beginning of the run-queue has
314 * a separate lock).
315 */
316 extern rwlock_t tasklist_lock;
317 extern spinlock_t mmlist_lock;
318
319 struct task_struct;
320
321 #ifdef CONFIG_PROVE_RCU
322 extern int lockdep_tasklist_lock_is_held(void);
323 #endif /* #ifdef CONFIG_PROVE_RCU */
324
325 extern void sched_init(void);
326 extern void sched_init_smp(void);
327 extern asmlinkage void schedule_tail(struct task_struct *prev);
328 extern void init_idle(struct task_struct *idle, int cpu);
329 extern void init_idle_bootup_task(struct task_struct *idle);
330
331 extern cpumask_var_t cpu_isolated_map;
332
333 extern int runqueue_is_locked(int cpu);
334
335 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
336 extern void nohz_balance_enter_idle(int cpu);
337 extern void set_cpu_sd_state_idle(void);
338 extern int get_nohz_timer_target(int pinned);
339 #else
nohz_balance_enter_idle(int cpu)340 static inline void nohz_balance_enter_idle(int cpu) { }
set_cpu_sd_state_idle(void)341 static inline void set_cpu_sd_state_idle(void) { }
get_nohz_timer_target(int pinned)342 static inline int get_nohz_timer_target(int pinned)
343 {
344 return smp_processor_id();
345 }
346 #endif
347
348 /*
349 * Only dump TASK_* tasks. (0 for all tasks)
350 */
351 extern void show_state_filter(unsigned long state_filter);
352
show_state(void)353 static inline void show_state(void)
354 {
355 show_state_filter(0);
356 }
357
358 extern void show_regs(struct pt_regs *);
359
360 /*
361 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
362 * task), SP is the stack pointer of the first frame that should be shown in the back
363 * trace (or NULL if the entire call-chain of the task should be shown).
364 */
365 extern void show_stack(struct task_struct *task, unsigned long *sp);
366
367 extern void cpu_init (void);
368 extern void trap_init(void);
369 extern void update_process_times(int user);
370 extern void scheduler_tick(void);
371
372 extern void sched_show_task(struct task_struct *p);
373
374 #ifdef CONFIG_LOCKUP_DETECTOR
375 extern void touch_softlockup_watchdog(void);
376 extern void touch_softlockup_watchdog_sync(void);
377 extern void touch_all_softlockup_watchdogs(void);
378 extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
379 void __user *buffer,
380 size_t *lenp, loff_t *ppos);
381 extern unsigned int softlockup_panic;
382 void lockup_detector_init(void);
383 #else
touch_softlockup_watchdog(void)384 static inline void touch_softlockup_watchdog(void)
385 {
386 }
touch_softlockup_watchdog_sync(void)387 static inline void touch_softlockup_watchdog_sync(void)
388 {
389 }
touch_all_softlockup_watchdogs(void)390 static inline void touch_all_softlockup_watchdogs(void)
391 {
392 }
lockup_detector_init(void)393 static inline void lockup_detector_init(void)
394 {
395 }
396 #endif
397
398 #ifdef CONFIG_DETECT_HUNG_TASK
399 void reset_hung_task_detector(void);
400 #else
reset_hung_task_detector(void)401 static inline void reset_hung_task_detector(void)
402 {
403 }
404 #endif
405
406 /* Attach to any functions which should be ignored in wchan output. */
407 #define __sched __attribute__((__section__(".sched.text")))
408
409 /* Linker adds these: start and end of __sched functions */
410 extern char __sched_text_start[], __sched_text_end[];
411
412 /* Is this address in the __sched functions? */
413 extern int in_sched_functions(unsigned long addr);
414
415 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
416 extern signed long schedule_timeout(signed long timeout);
417 extern signed long schedule_timeout_interruptible(signed long timeout);
418 extern signed long schedule_timeout_killable(signed long timeout);
419 extern signed long schedule_timeout_uninterruptible(signed long timeout);
420 asmlinkage void schedule(void);
421 extern void schedule_preempt_disabled(void);
422
423 extern long io_schedule_timeout(long timeout);
424
io_schedule(void)425 static inline void io_schedule(void)
426 {
427 io_schedule_timeout(MAX_SCHEDULE_TIMEOUT);
428 }
429
430 struct nsproxy;
431 struct user_namespace;
432
433 #ifdef CONFIG_MMU
434 extern void arch_pick_mmap_layout(struct mm_struct *mm);
435 extern unsigned long
436 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
437 unsigned long, unsigned long);
438 extern unsigned long
439 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
440 unsigned long len, unsigned long pgoff,
441 unsigned long flags);
442 #else
arch_pick_mmap_layout(struct mm_struct * mm)443 static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
444 #endif
445
446 #define SUID_DUMP_DISABLE 0 /* No setuid dumping */
447 #define SUID_DUMP_USER 1 /* Dump as user of process */
448 #define SUID_DUMP_ROOT 2 /* Dump as root */
449
450 /* mm flags */
451
452 /* for SUID_DUMP_* above */
453 #define MMF_DUMPABLE_BITS 2
454 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
455
456 extern void set_dumpable(struct mm_struct *mm, int value);
457 /*
458 * This returns the actual value of the suid_dumpable flag. For things
459 * that are using this for checking for privilege transitions, it must
460 * test against SUID_DUMP_USER rather than treating it as a boolean
461 * value.
462 */
__get_dumpable(unsigned long mm_flags)463 static inline int __get_dumpable(unsigned long mm_flags)
464 {
465 return mm_flags & MMF_DUMPABLE_MASK;
466 }
467
get_dumpable(struct mm_struct * mm)468 static inline int get_dumpable(struct mm_struct *mm)
469 {
470 return __get_dumpable(mm->flags);
471 }
472
473 /* coredump filter bits */
474 #define MMF_DUMP_ANON_PRIVATE 2
475 #define MMF_DUMP_ANON_SHARED 3
476 #define MMF_DUMP_MAPPED_PRIVATE 4
477 #define MMF_DUMP_MAPPED_SHARED 5
478 #define MMF_DUMP_ELF_HEADERS 6
479 #define MMF_DUMP_HUGETLB_PRIVATE 7
480 #define MMF_DUMP_HUGETLB_SHARED 8
481
482 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
483 #define MMF_DUMP_FILTER_BITS 7
484 #define MMF_DUMP_FILTER_MASK \
485 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
486 #define MMF_DUMP_FILTER_DEFAULT \
487 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
488 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
489
490 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
491 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
492 #else
493 # define MMF_DUMP_MASK_DEFAULT_ELF 0
494 #endif
495 /* leave room for more dump flags */
496 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
497 #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */
498 #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */
499
500 #define MMF_HAS_UPROBES 19 /* has uprobes */
501 #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */
502
503 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
504
505 struct sighand_struct {
506 atomic_t count;
507 struct k_sigaction action[_NSIG];
508 spinlock_t siglock;
509 wait_queue_head_t signalfd_wqh;
510 };
511
512 struct pacct_struct {
513 int ac_flag;
514 long ac_exitcode;
515 unsigned long ac_mem;
516 cputime_t ac_utime, ac_stime;
517 unsigned long ac_minflt, ac_majflt;
518 };
519
520 struct cpu_itimer {
521 cputime_t expires;
522 cputime_t incr;
523 u32 error;
524 u32 incr_error;
525 };
526
527 /**
528 * struct cputime - snaphsot of system and user cputime
529 * @utime: time spent in user mode
530 * @stime: time spent in system mode
531 *
532 * Gathers a generic snapshot of user and system time.
533 */
534 struct cputime {
535 cputime_t utime;
536 cputime_t stime;
537 };
538
539 /**
540 * struct task_cputime - collected CPU time counts
541 * @utime: time spent in user mode, in &cputime_t units
542 * @stime: time spent in kernel mode, in &cputime_t units
543 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
544 *
545 * This is an extension of struct cputime that includes the total runtime
546 * spent by the task from the scheduler point of view.
547 *
548 * As a result, this structure groups together three kinds of CPU time
549 * that are tracked for threads and thread groups. Most things considering
550 * CPU time want to group these counts together and treat all three
551 * of them in parallel.
552 */
553 struct task_cputime {
554 cputime_t utime;
555 cputime_t stime;
556 unsigned long long sum_exec_runtime;
557 };
558 /* Alternate field names when used to cache expirations. */
559 #define prof_exp stime
560 #define virt_exp utime
561 #define sched_exp sum_exec_runtime
562
563 #define INIT_CPUTIME \
564 (struct task_cputime) { \
565 .utime = 0, \
566 .stime = 0, \
567 .sum_exec_runtime = 0, \
568 }
569
570 #ifdef CONFIG_PREEMPT_COUNT
571 #define PREEMPT_DISABLED (1 + PREEMPT_ENABLED)
572 #else
573 #define PREEMPT_DISABLED PREEMPT_ENABLED
574 #endif
575
576 /*
577 * Disable preemption until the scheduler is running.
578 * Reset by start_kernel()->sched_init()->init_idle().
579 *
580 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
581 * before the scheduler is active -- see should_resched().
582 */
583 #define INIT_PREEMPT_COUNT (PREEMPT_DISABLED + PREEMPT_ACTIVE)
584
585 /**
586 * struct thread_group_cputimer - thread group interval timer counts
587 * @cputime: thread group interval timers.
588 * @running: non-zero when there are timers running and
589 * @cputime receives updates.
590 * @lock: lock for fields in this struct.
591 *
592 * This structure contains the version of task_cputime, above, that is
593 * used for thread group CPU timer calculations.
594 */
595 struct thread_group_cputimer {
596 struct task_cputime cputime;
597 int running;
598 raw_spinlock_t lock;
599 };
600
601 #include <linux/rwsem.h>
602 struct autogroup;
603
604 /*
605 * NOTE! "signal_struct" does not have its own
606 * locking, because a shared signal_struct always
607 * implies a shared sighand_struct, so locking
608 * sighand_struct is always a proper superset of
609 * the locking of signal_struct.
610 */
611 struct signal_struct {
612 atomic_t sigcnt;
613 atomic_t live;
614 int nr_threads;
615 struct list_head thread_head;
616
617 wait_queue_head_t wait_chldexit; /* for wait4() */
618
619 /* current thread group signal load-balancing target: */
620 struct task_struct *curr_target;
621
622 /* shared signal handling: */
623 struct sigpending shared_pending;
624
625 /* thread group exit support */
626 int group_exit_code;
627 /* overloaded:
628 * - notify group_exit_task when ->count is equal to notify_count
629 * - everyone except group_exit_task is stopped during signal delivery
630 * of fatal signals, group_exit_task processes the signal.
631 */
632 int notify_count;
633 struct task_struct *group_exit_task;
634
635 /* thread group stop support, overloads group_exit_code too */
636 int group_stop_count;
637 unsigned int flags; /* see SIGNAL_* flags below */
638
639 /*
640 * PR_SET_CHILD_SUBREAPER marks a process, like a service
641 * manager, to re-parent orphan (double-forking) child processes
642 * to this process instead of 'init'. The service manager is
643 * able to receive SIGCHLD signals and is able to investigate
644 * the process until it calls wait(). All children of this
645 * process will inherit a flag if they should look for a
646 * child_subreaper process at exit.
647 */
648 unsigned int is_child_subreaper:1;
649 unsigned int has_child_subreaper:1;
650
651 /* POSIX.1b Interval Timers */
652 int posix_timer_id;
653 struct list_head posix_timers;
654
655 /* ITIMER_REAL timer for the process */
656 struct hrtimer real_timer;
657 struct pid *leader_pid;
658 ktime_t it_real_incr;
659
660 /*
661 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
662 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
663 * values are defined to 0 and 1 respectively
664 */
665 struct cpu_itimer it[2];
666
667 /*
668 * Thread group totals for process CPU timers.
669 * See thread_group_cputimer(), et al, for details.
670 */
671 struct thread_group_cputimer cputimer;
672
673 /* Earliest-expiration cache. */
674 struct task_cputime cputime_expires;
675
676 struct list_head cpu_timers[3];
677
678 struct pid *tty_old_pgrp;
679
680 /* boolean value for session group leader */
681 int leader;
682
683 struct tty_struct *tty; /* NULL if no tty */
684
685 #ifdef CONFIG_SCHED_AUTOGROUP
686 struct autogroup *autogroup;
687 #endif
688 /*
689 * Cumulative resource counters for dead threads in the group,
690 * and for reaped dead child processes forked by this group.
691 * Live threads maintain their own counters and add to these
692 * in __exit_signal, except for the group leader.
693 */
694 seqlock_t stats_lock;
695 cputime_t utime, stime, cutime, cstime;
696 cputime_t gtime;
697 cputime_t cgtime;
698 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
699 struct cputime prev_cputime;
700 #endif
701 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
702 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
703 unsigned long inblock, oublock, cinblock, coublock;
704 unsigned long maxrss, cmaxrss;
705 struct task_io_accounting ioac;
706
707 /*
708 * Cumulative ns of schedule CPU time fo dead threads in the
709 * group, not including a zombie group leader, (This only differs
710 * from jiffies_to_ns(utime + stime) if sched_clock uses something
711 * other than jiffies.)
712 */
713 unsigned long long sum_sched_runtime;
714
715 /*
716 * We don't bother to synchronize most readers of this at all,
717 * because there is no reader checking a limit that actually needs
718 * to get both rlim_cur and rlim_max atomically, and either one
719 * alone is a single word that can safely be read normally.
720 * getrlimit/setrlimit use task_lock(current->group_leader) to
721 * protect this instead of the siglock, because they really
722 * have no need to disable irqs.
723 */
724 struct rlimit rlim[RLIM_NLIMITS];
725
726 #ifdef CONFIG_BSD_PROCESS_ACCT
727 struct pacct_struct pacct; /* per-process accounting information */
728 #endif
729 #ifdef CONFIG_TASKSTATS
730 struct taskstats *stats;
731 #endif
732 #ifdef CONFIG_AUDIT
733 unsigned audit_tty;
734 unsigned audit_tty_log_passwd;
735 struct tty_audit_buf *tty_audit_buf;
736 #endif
737 #ifdef CONFIG_CGROUPS
738 /*
739 * group_rwsem prevents new tasks from entering the threadgroup and
740 * member tasks from exiting,a more specifically, setting of
741 * PF_EXITING. fork and exit paths are protected with this rwsem
742 * using threadgroup_change_begin/end(). Users which require
743 * threadgroup to remain stable should use threadgroup_[un]lock()
744 * which also takes care of exec path. Currently, cgroup is the
745 * only user.
746 */
747 struct rw_semaphore group_rwsem;
748 #endif
749
750 oom_flags_t oom_flags;
751 short oom_score_adj; /* OOM kill score adjustment */
752 short oom_score_adj_min; /* OOM kill score adjustment min value.
753 * Only settable by CAP_SYS_RESOURCE. */
754
755 struct mutex cred_guard_mutex; /* guard against foreign influences on
756 * credential calculations
757 * (notably. ptrace) */
758 };
759
760 /*
761 * Bits in flags field of signal_struct.
762 */
763 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
764 #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
765 #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
766 #define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */
767 /*
768 * Pending notifications to parent.
769 */
770 #define SIGNAL_CLD_STOPPED 0x00000010
771 #define SIGNAL_CLD_CONTINUED 0x00000020
772 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
773
774 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
775
776 /* If true, all threads except ->group_exit_task have pending SIGKILL */
signal_group_exit(const struct signal_struct * sig)777 static inline int signal_group_exit(const struct signal_struct *sig)
778 {
779 return (sig->flags & SIGNAL_GROUP_EXIT) ||
780 (sig->group_exit_task != NULL);
781 }
782
783 /*
784 * Some day this will be a full-fledged user tracking system..
785 */
786 struct user_struct {
787 atomic_t __count; /* reference count */
788 atomic_t processes; /* How many processes does this user have? */
789 atomic_t sigpending; /* How many pending signals does this user have? */
790 #ifdef CONFIG_INOTIFY_USER
791 atomic_t inotify_watches; /* How many inotify watches does this user have? */
792 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
793 #endif
794 #ifdef CONFIG_FANOTIFY
795 atomic_t fanotify_listeners;
796 #endif
797 #ifdef CONFIG_EPOLL
798 atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
799 #endif
800 #ifdef CONFIG_POSIX_MQUEUE
801 /* protected by mq_lock */
802 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
803 #endif
804 unsigned long locked_shm; /* How many pages of mlocked shm ? */
805 unsigned long unix_inflight; /* How many files in flight in unix sockets */
806
807 #ifdef CONFIG_KEYS
808 struct key *uid_keyring; /* UID specific keyring */
809 struct key *session_keyring; /* UID's default session keyring */
810 #endif
811
812 /* Hash table maintenance information */
813 struct hlist_node uidhash_node;
814 kuid_t uid;
815
816 #ifdef CONFIG_PERF_EVENTS
817 atomic_long_t locked_vm;
818 #endif
819 };
820
821 extern int uids_sysfs_init(void);
822
823 extern struct user_struct *find_user(kuid_t);
824
825 extern struct user_struct root_user;
826 #define INIT_USER (&root_user)
827
828
829 struct backing_dev_info;
830 struct reclaim_state;
831
832 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
833 struct sched_info {
834 /* cumulative counters */
835 unsigned long pcount; /* # of times run on this cpu */
836 unsigned long long run_delay; /* time spent waiting on a runqueue */
837
838 /* timestamps */
839 unsigned long long last_arrival,/* when we last ran on a cpu */
840 last_queued; /* when we were last queued to run */
841 };
842 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
843
844 #ifdef CONFIG_TASK_DELAY_ACCT
845 struct task_delay_info {
846 spinlock_t lock;
847 unsigned int flags; /* Private per-task flags */
848
849 /* For each stat XXX, add following, aligned appropriately
850 *
851 * struct timespec XXX_start, XXX_end;
852 * u64 XXX_delay;
853 * u32 XXX_count;
854 *
855 * Atomicity of updates to XXX_delay, XXX_count protected by
856 * single lock above (split into XXX_lock if contention is an issue).
857 */
858
859 /*
860 * XXX_count is incremented on every XXX operation, the delay
861 * associated with the operation is added to XXX_delay.
862 * XXX_delay contains the accumulated delay time in nanoseconds.
863 */
864 u64 blkio_start; /* Shared by blkio, swapin */
865 u64 blkio_delay; /* wait for sync block io completion */
866 u64 swapin_delay; /* wait for swapin block io completion */
867 u32 blkio_count; /* total count of the number of sync block */
868 /* io operations performed */
869 u32 swapin_count; /* total count of the number of swapin block */
870 /* io operations performed */
871
872 u64 freepages_start;
873 u64 freepages_delay; /* wait for memory reclaim */
874 u32 freepages_count; /* total count of memory reclaim */
875 };
876 #endif /* CONFIG_TASK_DELAY_ACCT */
877
sched_info_on(void)878 static inline int sched_info_on(void)
879 {
880 #ifdef CONFIG_SCHEDSTATS
881 return 1;
882 #elif defined(CONFIG_TASK_DELAY_ACCT)
883 extern int delayacct_on;
884 return delayacct_on;
885 #else
886 return 0;
887 #endif
888 }
889
890 enum cpu_idle_type {
891 CPU_IDLE,
892 CPU_NOT_IDLE,
893 CPU_NEWLY_IDLE,
894 CPU_MAX_IDLE_TYPES
895 };
896
897 /*
898 * Increase resolution of cpu_capacity calculations
899 */
900 #define SCHED_CAPACITY_SHIFT 10
901 #define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT)
902
903 /*
904 * sched-domains (multiprocessor balancing) declarations:
905 */
906 #ifdef CONFIG_SMP
907 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
908 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
909 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
910 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
911 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
912 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
913 #define SD_SHARE_CPUCAPACITY 0x0080 /* Domain members share cpu power */
914 #define SD_SHARE_POWERDOMAIN 0x0100 /* Domain members share power domain */
915 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
916 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
917 #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
918 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
919 #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
920 #define SD_NUMA 0x4000 /* cross-node balancing */
921
922 #ifdef CONFIG_SCHED_SMT
cpu_smt_flags(void)923 static inline int cpu_smt_flags(void)
924 {
925 return SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES;
926 }
927 #endif
928
929 #ifdef CONFIG_SCHED_MC
cpu_core_flags(void)930 static inline int cpu_core_flags(void)
931 {
932 return SD_SHARE_PKG_RESOURCES;
933 }
934 #endif
935
936 #ifdef CONFIG_NUMA
cpu_numa_flags(void)937 static inline int cpu_numa_flags(void)
938 {
939 return SD_NUMA;
940 }
941 #endif
942
943 struct sched_domain_attr {
944 int relax_domain_level;
945 };
946
947 #define SD_ATTR_INIT (struct sched_domain_attr) { \
948 .relax_domain_level = -1, \
949 }
950
951 extern int sched_domain_level_max;
952
953 struct sched_group;
954
955 struct sched_domain {
956 /* These fields must be setup */
957 struct sched_domain *parent; /* top domain must be null terminated */
958 struct sched_domain *child; /* bottom domain must be null terminated */
959 struct sched_group *groups; /* the balancing groups of the domain */
960 unsigned long min_interval; /* Minimum balance interval ms */
961 unsigned long max_interval; /* Maximum balance interval ms */
962 unsigned int busy_factor; /* less balancing by factor if busy */
963 unsigned int imbalance_pct; /* No balance until over watermark */
964 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
965 unsigned int busy_idx;
966 unsigned int idle_idx;
967 unsigned int newidle_idx;
968 unsigned int wake_idx;
969 unsigned int forkexec_idx;
970 unsigned int smt_gain;
971
972 int nohz_idle; /* NOHZ IDLE status */
973 int flags; /* See SD_* */
974 int level;
975
976 /* Runtime fields. */
977 unsigned long last_balance; /* init to jiffies. units in jiffies */
978 unsigned int balance_interval; /* initialise to 1. units in ms. */
979 unsigned int nr_balance_failed; /* initialise to 0 */
980
981 /* idle_balance() stats */
982 u64 max_newidle_lb_cost;
983 unsigned long next_decay_max_lb_cost;
984
985 #ifdef CONFIG_SCHEDSTATS
986 /* load_balance() stats */
987 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
988 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
989 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
990 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
991 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
992 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
993 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
994 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
995
996 /* Active load balancing */
997 unsigned int alb_count;
998 unsigned int alb_failed;
999 unsigned int alb_pushed;
1000
1001 /* SD_BALANCE_EXEC stats */
1002 unsigned int sbe_count;
1003 unsigned int sbe_balanced;
1004 unsigned int sbe_pushed;
1005
1006 /* SD_BALANCE_FORK stats */
1007 unsigned int sbf_count;
1008 unsigned int sbf_balanced;
1009 unsigned int sbf_pushed;
1010
1011 /* try_to_wake_up() stats */
1012 unsigned int ttwu_wake_remote;
1013 unsigned int ttwu_move_affine;
1014 unsigned int ttwu_move_balance;
1015 #endif
1016 #ifdef CONFIG_SCHED_DEBUG
1017 char *name;
1018 #endif
1019 union {
1020 void *private; /* used during construction */
1021 struct rcu_head rcu; /* used during destruction */
1022 };
1023
1024 unsigned int span_weight;
1025 /*
1026 * Span of all CPUs in this domain.
1027 *
1028 * NOTE: this field is variable length. (Allocated dynamically
1029 * by attaching extra space to the end of the structure,
1030 * depending on how many CPUs the kernel has booted up with)
1031 */
1032 unsigned long span[0];
1033 };
1034
sched_domain_span(struct sched_domain * sd)1035 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
1036 {
1037 return to_cpumask(sd->span);
1038 }
1039
1040 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1041 struct sched_domain_attr *dattr_new);
1042
1043 /* Allocate an array of sched domains, for partition_sched_domains(). */
1044 cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
1045 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
1046
1047 bool cpus_share_cache(int this_cpu, int that_cpu);
1048
1049 typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
1050 typedef int (*sched_domain_flags_f)(void);
1051
1052 #define SDTL_OVERLAP 0x01
1053
1054 struct sd_data {
1055 struct sched_domain **__percpu sd;
1056 struct sched_group **__percpu sg;
1057 struct sched_group_capacity **__percpu sgc;
1058 };
1059
1060 struct sched_domain_topology_level {
1061 sched_domain_mask_f mask;
1062 sched_domain_flags_f sd_flags;
1063 int flags;
1064 int numa_level;
1065 struct sd_data data;
1066 #ifdef CONFIG_SCHED_DEBUG
1067 char *name;
1068 #endif
1069 };
1070
1071 extern struct sched_domain_topology_level *sched_domain_topology;
1072
1073 extern void set_sched_topology(struct sched_domain_topology_level *tl);
1074 extern void wake_up_if_idle(int cpu);
1075
1076 #ifdef CONFIG_SCHED_DEBUG
1077 # define SD_INIT_NAME(type) .name = #type
1078 #else
1079 # define SD_INIT_NAME(type)
1080 #endif
1081
1082 #else /* CONFIG_SMP */
1083
1084 struct sched_domain_attr;
1085
1086 static inline void
partition_sched_domains(int ndoms_new,cpumask_var_t doms_new[],struct sched_domain_attr * dattr_new)1087 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1088 struct sched_domain_attr *dattr_new)
1089 {
1090 }
1091
cpus_share_cache(int this_cpu,int that_cpu)1092 static inline bool cpus_share_cache(int this_cpu, int that_cpu)
1093 {
1094 return true;
1095 }
1096
1097 #endif /* !CONFIG_SMP */
1098
1099
1100 struct io_context; /* See blkdev.h */
1101
1102
1103 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1104 extern void prefetch_stack(struct task_struct *t);
1105 #else
prefetch_stack(struct task_struct * t)1106 static inline void prefetch_stack(struct task_struct *t) { }
1107 #endif
1108
1109 struct audit_context; /* See audit.c */
1110 struct mempolicy;
1111 struct pipe_inode_info;
1112 struct uts_namespace;
1113
1114 struct load_weight {
1115 unsigned long weight;
1116 u32 inv_weight;
1117 };
1118
1119 struct sched_avg {
1120 u64 last_runnable_update;
1121 s64 decay_count;
1122 /*
1123 * utilization_avg_contrib describes the amount of time that a
1124 * sched_entity is running on a CPU. It is based on running_avg_sum
1125 * and is scaled in the range [0..SCHED_LOAD_SCALE].
1126 * load_avg_contrib described the amount of time that a sched_entity
1127 * is runnable on a rq. It is based on both runnable_avg_sum and the
1128 * weight of the task.
1129 */
1130 unsigned long load_avg_contrib, utilization_avg_contrib;
1131 /*
1132 * These sums represent an infinite geometric series and so are bound
1133 * above by 1024/(1-y). Thus we only need a u32 to store them for all
1134 * choices of y < 1-2^(-32)*1024.
1135 * running_avg_sum reflects the time that the sched_entity is
1136 * effectively running on the CPU.
1137 * runnable_avg_sum represents the amount of time a sched_entity is on
1138 * a runqueue which includes the running time that is monitored by
1139 * running_avg_sum.
1140 */
1141 u32 runnable_avg_sum, avg_period, running_avg_sum;
1142 };
1143
1144 #ifdef CONFIG_SCHEDSTATS
1145 struct sched_statistics {
1146 u64 wait_start;
1147 u64 wait_max;
1148 u64 wait_count;
1149 u64 wait_sum;
1150 u64 iowait_count;
1151 u64 iowait_sum;
1152
1153 u64 sleep_start;
1154 u64 sleep_max;
1155 s64 sum_sleep_runtime;
1156
1157 u64 block_start;
1158 u64 block_max;
1159 u64 exec_max;
1160 u64 slice_max;
1161
1162 u64 nr_migrations_cold;
1163 u64 nr_failed_migrations_affine;
1164 u64 nr_failed_migrations_running;
1165 u64 nr_failed_migrations_hot;
1166 u64 nr_forced_migrations;
1167
1168 u64 nr_wakeups;
1169 u64 nr_wakeups_sync;
1170 u64 nr_wakeups_migrate;
1171 u64 nr_wakeups_local;
1172 u64 nr_wakeups_remote;
1173 u64 nr_wakeups_affine;
1174 u64 nr_wakeups_affine_attempts;
1175 u64 nr_wakeups_passive;
1176 u64 nr_wakeups_idle;
1177 };
1178 #endif
1179
1180 struct sched_entity {
1181 struct load_weight load; /* for load-balancing */
1182 struct rb_node run_node;
1183 struct list_head group_node;
1184 unsigned int on_rq;
1185
1186 u64 exec_start;
1187 u64 sum_exec_runtime;
1188 u64 vruntime;
1189 u64 prev_sum_exec_runtime;
1190
1191 u64 nr_migrations;
1192
1193 #ifdef CONFIG_SCHEDSTATS
1194 struct sched_statistics statistics;
1195 #endif
1196
1197 #ifdef CONFIG_FAIR_GROUP_SCHED
1198 int depth;
1199 struct sched_entity *parent;
1200 /* rq on which this entity is (to be) queued: */
1201 struct cfs_rq *cfs_rq;
1202 /* rq "owned" by this entity/group: */
1203 struct cfs_rq *my_q;
1204 #endif
1205
1206 #ifdef CONFIG_SMP
1207 /* Per-entity load-tracking */
1208 struct sched_avg avg;
1209 #endif
1210 };
1211
1212 struct sched_rt_entity {
1213 struct list_head run_list;
1214 unsigned long timeout;
1215 unsigned long watchdog_stamp;
1216 unsigned int time_slice;
1217
1218 struct sched_rt_entity *back;
1219 #ifdef CONFIG_RT_GROUP_SCHED
1220 struct sched_rt_entity *parent;
1221 /* rq on which this entity is (to be) queued: */
1222 struct rt_rq *rt_rq;
1223 /* rq "owned" by this entity/group: */
1224 struct rt_rq *my_q;
1225 #endif
1226 };
1227
1228 struct sched_dl_entity {
1229 struct rb_node rb_node;
1230
1231 /*
1232 * Original scheduling parameters. Copied here from sched_attr
1233 * during sched_setattr(), they will remain the same until
1234 * the next sched_setattr().
1235 */
1236 u64 dl_runtime; /* maximum runtime for each instance */
1237 u64 dl_deadline; /* relative deadline of each instance */
1238 u64 dl_period; /* separation of two instances (period) */
1239 u64 dl_bw; /* dl_runtime / dl_deadline */
1240
1241 /*
1242 * Actual scheduling parameters. Initialized with the values above,
1243 * they are continously updated during task execution. Note that
1244 * the remaining runtime could be < 0 in case we are in overrun.
1245 */
1246 s64 runtime; /* remaining runtime for this instance */
1247 u64 deadline; /* absolute deadline for this instance */
1248 unsigned int flags; /* specifying the scheduler behaviour */
1249
1250 /*
1251 * Some bool flags:
1252 *
1253 * @dl_throttled tells if we exhausted the runtime. If so, the
1254 * task has to wait for a replenishment to be performed at the
1255 * next firing of dl_timer.
1256 *
1257 * @dl_new tells if a new instance arrived. If so we must
1258 * start executing it with full runtime and reset its absolute
1259 * deadline;
1260 *
1261 * @dl_boosted tells if we are boosted due to DI. If so we are
1262 * outside bandwidth enforcement mechanism (but only until we
1263 * exit the critical section);
1264 *
1265 * @dl_yielded tells if task gave up the cpu before consuming
1266 * all its available runtime during the last job.
1267 */
1268 int dl_throttled, dl_new, dl_boosted, dl_yielded;
1269
1270 /*
1271 * Bandwidth enforcement timer. Each -deadline task has its
1272 * own bandwidth to be enforced, thus we need one timer per task.
1273 */
1274 struct hrtimer dl_timer;
1275 };
1276
1277 union rcu_special {
1278 struct {
1279 bool blocked;
1280 bool need_qs;
1281 } b;
1282 short s;
1283 };
1284 struct rcu_node;
1285
1286 enum perf_event_task_context {
1287 perf_invalid_context = -1,
1288 perf_hw_context = 0,
1289 perf_sw_context,
1290 perf_nr_task_contexts,
1291 };
1292
1293 struct task_struct {
1294 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
1295 void *stack;
1296 atomic_t usage;
1297 unsigned int flags; /* per process flags, defined below */
1298 unsigned int ptrace;
1299
1300 #ifdef CONFIG_SMP
1301 struct llist_node wake_entry;
1302 int on_cpu;
1303 struct task_struct *last_wakee;
1304 unsigned long wakee_flips;
1305 unsigned long wakee_flip_decay_ts;
1306
1307 int wake_cpu;
1308 #endif
1309 int on_rq;
1310
1311 int prio, static_prio, normal_prio;
1312 unsigned int rt_priority;
1313 const struct sched_class *sched_class;
1314 struct sched_entity se;
1315 struct sched_rt_entity rt;
1316 #ifdef CONFIG_CGROUP_SCHED
1317 struct task_group *sched_task_group;
1318 #endif
1319 struct sched_dl_entity dl;
1320
1321 #ifdef CONFIG_PREEMPT_NOTIFIERS
1322 /* list of struct preempt_notifier: */
1323 struct hlist_head preempt_notifiers;
1324 #endif
1325
1326 #ifdef CONFIG_BLK_DEV_IO_TRACE
1327 unsigned int btrace_seq;
1328 #endif
1329
1330 unsigned int policy;
1331 int nr_cpus_allowed;
1332 cpumask_t cpus_allowed;
1333
1334 #ifdef CONFIG_PREEMPT_RCU
1335 int rcu_read_lock_nesting;
1336 union rcu_special rcu_read_unlock_special;
1337 struct list_head rcu_node_entry;
1338 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1339 #ifdef CONFIG_PREEMPT_RCU
1340 struct rcu_node *rcu_blocked_node;
1341 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1342 #ifdef CONFIG_TASKS_RCU
1343 unsigned long rcu_tasks_nvcsw;
1344 bool rcu_tasks_holdout;
1345 struct list_head rcu_tasks_holdout_list;
1346 int rcu_tasks_idle_cpu;
1347 #endif /* #ifdef CONFIG_TASKS_RCU */
1348
1349 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1350 struct sched_info sched_info;
1351 #endif
1352
1353 struct list_head tasks;
1354 #ifdef CONFIG_SMP
1355 struct plist_node pushable_tasks;
1356 struct rb_node pushable_dl_tasks;
1357 #endif
1358
1359 struct mm_struct *mm, *active_mm;
1360 #ifdef CONFIG_COMPAT_BRK
1361 unsigned brk_randomized:1;
1362 #endif
1363 /* per-thread vma caching */
1364 u32 vmacache_seqnum;
1365 struct vm_area_struct *vmacache[VMACACHE_SIZE];
1366 #if defined(SPLIT_RSS_COUNTING)
1367 struct task_rss_stat rss_stat;
1368 #endif
1369 /* task state */
1370 int exit_state;
1371 int exit_code, exit_signal;
1372 int pdeath_signal; /* The signal sent when the parent dies */
1373 unsigned int jobctl; /* JOBCTL_*, siglock protected */
1374
1375 /* Used for emulating ABI behavior of previous Linux versions */
1376 unsigned int personality;
1377
1378 unsigned in_execve:1; /* Tell the LSMs that the process is doing an
1379 * execve */
1380 unsigned in_iowait:1;
1381
1382 /* Revert to default priority/policy when forking */
1383 unsigned sched_reset_on_fork:1;
1384 unsigned sched_contributes_to_load:1;
1385
1386 #ifdef CONFIG_MEMCG_KMEM
1387 unsigned memcg_kmem_skip_account:1;
1388 #endif
1389
1390 unsigned long atomic_flags; /* Flags needing atomic access. */
1391
1392 struct restart_block restart_block;
1393
1394 pid_t pid;
1395 pid_t tgid;
1396
1397 #ifdef CONFIG_CC_STACKPROTECTOR
1398 /* Canary value for the -fstack-protector gcc feature */
1399 unsigned long stack_canary;
1400 #endif
1401 /*
1402 * pointers to (original) parent process, youngest child, younger sibling,
1403 * older sibling, respectively. (p->father can be replaced with
1404 * p->real_parent->pid)
1405 */
1406 struct task_struct __rcu *real_parent; /* real parent process */
1407 struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */
1408 /*
1409 * children/sibling forms the list of my natural children
1410 */
1411 struct list_head children; /* list of my children */
1412 struct list_head sibling; /* linkage in my parent's children list */
1413 struct task_struct *group_leader; /* threadgroup leader */
1414
1415 /*
1416 * ptraced is the list of tasks this task is using ptrace on.
1417 * This includes both natural children and PTRACE_ATTACH targets.
1418 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1419 */
1420 struct list_head ptraced;
1421 struct list_head ptrace_entry;
1422
1423 /* PID/PID hash table linkage. */
1424 struct pid_link pids[PIDTYPE_MAX];
1425 struct list_head thread_group;
1426 struct list_head thread_node;
1427
1428 struct completion *vfork_done; /* for vfork() */
1429 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1430 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1431
1432 cputime_t utime, stime, utimescaled, stimescaled;
1433 cputime_t gtime;
1434 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
1435 struct cputime prev_cputime;
1436 #endif
1437 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1438 seqlock_t vtime_seqlock;
1439 unsigned long long vtime_snap;
1440 enum {
1441 VTIME_SLEEPING = 0,
1442 VTIME_USER,
1443 VTIME_SYS,
1444 } vtime_snap_whence;
1445 #endif
1446 unsigned long nvcsw, nivcsw; /* context switch counts */
1447 u64 start_time; /* monotonic time in nsec */
1448 u64 real_start_time; /* boot based time in nsec */
1449 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1450 unsigned long min_flt, maj_flt;
1451
1452 struct task_cputime cputime_expires;
1453 struct list_head cpu_timers[3];
1454
1455 /* process credentials */
1456 const struct cred __rcu *real_cred; /* objective and real subjective task
1457 * credentials (COW) */
1458 const struct cred __rcu *cred; /* effective (overridable) subjective task
1459 * credentials (COW) */
1460 char comm[TASK_COMM_LEN]; /* executable name excluding path
1461 - access with [gs]et_task_comm (which lock
1462 it with task_lock())
1463 - initialized normally by setup_new_exec */
1464 /* file system info */
1465 int link_count, total_link_count;
1466 #ifdef CONFIG_SYSVIPC
1467 /* ipc stuff */
1468 struct sysv_sem sysvsem;
1469 struct sysv_shm sysvshm;
1470 #endif
1471 #ifdef CONFIG_DETECT_HUNG_TASK
1472 /* hung task detection */
1473 unsigned long last_switch_count;
1474 #endif
1475 /* CPU-specific state of this task */
1476 struct thread_struct thread;
1477 /* filesystem information */
1478 struct fs_struct *fs;
1479 /* open file information */
1480 struct files_struct *files;
1481 /* namespaces */
1482 struct nsproxy *nsproxy;
1483 /* signal handlers */
1484 struct signal_struct *signal;
1485 struct sighand_struct *sighand;
1486
1487 sigset_t blocked, real_blocked;
1488 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1489 struct sigpending pending;
1490
1491 unsigned long sas_ss_sp;
1492 size_t sas_ss_size;
1493 int (*notifier)(void *priv);
1494 void *notifier_data;
1495 sigset_t *notifier_mask;
1496 struct callback_head *task_works;
1497
1498 struct audit_context *audit_context;
1499 #ifdef CONFIG_AUDITSYSCALL
1500 kuid_t loginuid;
1501 unsigned int sessionid;
1502 #endif
1503 struct seccomp seccomp;
1504
1505 /* Thread group tracking */
1506 u32 parent_exec_id;
1507 u32 self_exec_id;
1508 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1509 * mempolicy */
1510 spinlock_t alloc_lock;
1511
1512 /* Protection of the PI data structures: */
1513 raw_spinlock_t pi_lock;
1514
1515 #ifdef CONFIG_RT_MUTEXES
1516 /* PI waiters blocked on a rt_mutex held by this task */
1517 struct rb_root pi_waiters;
1518 struct rb_node *pi_waiters_leftmost;
1519 /* Deadlock detection and priority inheritance handling */
1520 struct rt_mutex_waiter *pi_blocked_on;
1521 #endif
1522
1523 #ifdef CONFIG_DEBUG_MUTEXES
1524 /* mutex deadlock detection */
1525 struct mutex_waiter *blocked_on;
1526 #endif
1527 #ifdef CONFIG_TRACE_IRQFLAGS
1528 unsigned int irq_events;
1529 unsigned long hardirq_enable_ip;
1530 unsigned long hardirq_disable_ip;
1531 unsigned int hardirq_enable_event;
1532 unsigned int hardirq_disable_event;
1533 int hardirqs_enabled;
1534 int hardirq_context;
1535 unsigned long softirq_disable_ip;
1536 unsigned long softirq_enable_ip;
1537 unsigned int softirq_disable_event;
1538 unsigned int softirq_enable_event;
1539 int softirqs_enabled;
1540 int softirq_context;
1541 #endif
1542 #ifdef CONFIG_LOCKDEP
1543 # define MAX_LOCK_DEPTH 48UL
1544 u64 curr_chain_key;
1545 int lockdep_depth;
1546 unsigned int lockdep_recursion;
1547 struct held_lock held_locks[MAX_LOCK_DEPTH];
1548 gfp_t lockdep_reclaim_gfp;
1549 #endif
1550
1551 /* journalling filesystem info */
1552 void *journal_info;
1553
1554 /* stacked block device info */
1555 struct bio_list *bio_list;
1556
1557 #ifdef CONFIG_BLOCK
1558 /* stack plugging */
1559 struct blk_plug *plug;
1560 #endif
1561
1562 /* VM state */
1563 struct reclaim_state *reclaim_state;
1564
1565 struct backing_dev_info *backing_dev_info;
1566
1567 struct io_context *io_context;
1568
1569 unsigned long ptrace_message;
1570 siginfo_t *last_siginfo; /* For ptrace use. */
1571 struct task_io_accounting ioac;
1572 #if defined(CONFIG_TASK_XACCT)
1573 u64 acct_rss_mem1; /* accumulated rss usage */
1574 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1575 cputime_t acct_timexpd; /* stime + utime since last update */
1576 #endif
1577 #ifdef CONFIG_CPUSETS
1578 nodemask_t mems_allowed; /* Protected by alloc_lock */
1579 seqcount_t mems_allowed_seq; /* Seqence no to catch updates */
1580 int cpuset_mem_spread_rotor;
1581 int cpuset_slab_spread_rotor;
1582 #endif
1583 #ifdef CONFIG_CGROUPS
1584 /* Control Group info protected by css_set_lock */
1585 struct css_set __rcu *cgroups;
1586 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1587 struct list_head cg_list;
1588 #endif
1589 #ifdef CONFIG_FUTEX
1590 struct robust_list_head __user *robust_list;
1591 #ifdef CONFIG_COMPAT
1592 struct compat_robust_list_head __user *compat_robust_list;
1593 #endif
1594 struct list_head pi_state_list;
1595 struct futex_pi_state *pi_state_cache;
1596 #endif
1597 #ifdef CONFIG_PERF_EVENTS
1598 struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1599 struct mutex perf_event_mutex;
1600 struct list_head perf_event_list;
1601 #endif
1602 #ifdef CONFIG_DEBUG_PREEMPT
1603 unsigned long preempt_disable_ip;
1604 #endif
1605 #ifdef CONFIG_NUMA
1606 struct mempolicy *mempolicy; /* Protected by alloc_lock */
1607 short il_next;
1608 short pref_node_fork;
1609 #endif
1610 #ifdef CONFIG_NUMA_BALANCING
1611 int numa_scan_seq;
1612 unsigned int numa_scan_period;
1613 unsigned int numa_scan_period_max;
1614 int numa_preferred_nid;
1615 unsigned long numa_migrate_retry;
1616 u64 node_stamp; /* migration stamp */
1617 u64 last_task_numa_placement;
1618 u64 last_sum_exec_runtime;
1619 struct callback_head numa_work;
1620
1621 struct list_head numa_entry;
1622 struct numa_group *numa_group;
1623
1624 /*
1625 * numa_faults is an array split into four regions:
1626 * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer
1627 * in this precise order.
1628 *
1629 * faults_memory: Exponential decaying average of faults on a per-node
1630 * basis. Scheduling placement decisions are made based on these
1631 * counts. The values remain static for the duration of a PTE scan.
1632 * faults_cpu: Track the nodes the process was running on when a NUMA
1633 * hinting fault was incurred.
1634 * faults_memory_buffer and faults_cpu_buffer: Record faults per node
1635 * during the current scan window. When the scan completes, the counts
1636 * in faults_memory and faults_cpu decay and these values are copied.
1637 */
1638 unsigned long *numa_faults;
1639 unsigned long total_numa_faults;
1640
1641 /*
1642 * numa_faults_locality tracks if faults recorded during the last
1643 * scan window were remote/local or failed to migrate. The task scan
1644 * period is adapted based on the locality of the faults with different
1645 * weights depending on whether they were shared or private faults
1646 */
1647 unsigned long numa_faults_locality[3];
1648
1649 unsigned long numa_pages_migrated;
1650 #endif /* CONFIG_NUMA_BALANCING */
1651
1652 struct rcu_head rcu;
1653
1654 /*
1655 * cache last used pipe for splice
1656 */
1657 struct pipe_inode_info *splice_pipe;
1658
1659 struct page_frag task_frag;
1660
1661 #ifdef CONFIG_TASK_DELAY_ACCT
1662 struct task_delay_info *delays;
1663 #endif
1664 #ifdef CONFIG_FAULT_INJECTION
1665 int make_it_fail;
1666 #endif
1667 /*
1668 * when (nr_dirtied >= nr_dirtied_pause), it's time to call
1669 * balance_dirty_pages() for some dirty throttling pause
1670 */
1671 int nr_dirtied;
1672 int nr_dirtied_pause;
1673 unsigned long dirty_paused_when; /* start of a write-and-pause period */
1674
1675 #ifdef CONFIG_LATENCYTOP
1676 int latency_record_count;
1677 struct latency_record latency_record[LT_SAVECOUNT];
1678 #endif
1679 /*
1680 * time slack values; these are used to round up poll() and
1681 * select() etc timeout values. These are in nanoseconds.
1682 */
1683 unsigned long timer_slack_ns;
1684 unsigned long default_timer_slack_ns;
1685
1686 #ifdef CONFIG_KASAN
1687 unsigned int kasan_depth;
1688 #endif
1689 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1690 /* Index of current stored address in ret_stack */
1691 int curr_ret_stack;
1692 /* Stack of return addresses for return function tracing */
1693 struct ftrace_ret_stack *ret_stack;
1694 /* time stamp for last schedule */
1695 unsigned long long ftrace_timestamp;
1696 /*
1697 * Number of functions that haven't been traced
1698 * because of depth overrun.
1699 */
1700 atomic_t trace_overrun;
1701 /* Pause for the tracing */
1702 atomic_t tracing_graph_pause;
1703 #endif
1704 #ifdef CONFIG_TRACING
1705 /* state flags for use by tracers */
1706 unsigned long trace;
1707 /* bitmask and counter of trace recursion */
1708 unsigned long trace_recursion;
1709 #endif /* CONFIG_TRACING */
1710 #ifdef CONFIG_MEMCG
1711 struct memcg_oom_info {
1712 struct mem_cgroup *memcg;
1713 gfp_t gfp_mask;
1714 int order;
1715 unsigned int may_oom:1;
1716 } memcg_oom;
1717 #endif
1718 #ifdef CONFIG_UPROBES
1719 struct uprobe_task *utask;
1720 #endif
1721 #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
1722 unsigned int sequential_io;
1723 unsigned int sequential_io_avg;
1724 #endif
1725 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
1726 unsigned long task_state_change;
1727 #endif
1728 };
1729
1730 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1731 #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1732
1733 #define TNF_MIGRATED 0x01
1734 #define TNF_NO_GROUP 0x02
1735 #define TNF_SHARED 0x04
1736 #define TNF_FAULT_LOCAL 0x08
1737 #define TNF_MIGRATE_FAIL 0x10
1738
1739 #ifdef CONFIG_NUMA_BALANCING
1740 extern void task_numa_fault(int last_node, int node, int pages, int flags);
1741 extern pid_t task_numa_group_id(struct task_struct *p);
1742 extern void set_numabalancing_state(bool enabled);
1743 extern void task_numa_free(struct task_struct *p);
1744 extern bool should_numa_migrate_memory(struct task_struct *p, struct page *page,
1745 int src_nid, int dst_cpu);
1746 #else
task_numa_fault(int last_node,int node,int pages,int flags)1747 static inline void task_numa_fault(int last_node, int node, int pages,
1748 int flags)
1749 {
1750 }
task_numa_group_id(struct task_struct * p)1751 static inline pid_t task_numa_group_id(struct task_struct *p)
1752 {
1753 return 0;
1754 }
set_numabalancing_state(bool enabled)1755 static inline void set_numabalancing_state(bool enabled)
1756 {
1757 }
task_numa_free(struct task_struct * p)1758 static inline void task_numa_free(struct task_struct *p)
1759 {
1760 }
should_numa_migrate_memory(struct task_struct * p,struct page * page,int src_nid,int dst_cpu)1761 static inline bool should_numa_migrate_memory(struct task_struct *p,
1762 struct page *page, int src_nid, int dst_cpu)
1763 {
1764 return true;
1765 }
1766 #endif
1767
task_pid(struct task_struct * task)1768 static inline struct pid *task_pid(struct task_struct *task)
1769 {
1770 return task->pids[PIDTYPE_PID].pid;
1771 }
1772
task_tgid(struct task_struct * task)1773 static inline struct pid *task_tgid(struct task_struct *task)
1774 {
1775 return task->group_leader->pids[PIDTYPE_PID].pid;
1776 }
1777
1778 /*
1779 * Without tasklist or rcu lock it is not safe to dereference
1780 * the result of task_pgrp/task_session even if task == current,
1781 * we can race with another thread doing sys_setsid/sys_setpgid.
1782 */
task_pgrp(struct task_struct * task)1783 static inline struct pid *task_pgrp(struct task_struct *task)
1784 {
1785 return task->group_leader->pids[PIDTYPE_PGID].pid;
1786 }
1787
task_session(struct task_struct * task)1788 static inline struct pid *task_session(struct task_struct *task)
1789 {
1790 return task->group_leader->pids[PIDTYPE_SID].pid;
1791 }
1792
1793 struct pid_namespace;
1794
1795 /*
1796 * the helpers to get the task's different pids as they are seen
1797 * from various namespaces
1798 *
1799 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1800 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1801 * current.
1802 * task_xid_nr_ns() : id seen from the ns specified;
1803 *
1804 * set_task_vxid() : assigns a virtual id to a task;
1805 *
1806 * see also pid_nr() etc in include/linux/pid.h
1807 */
1808 pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
1809 struct pid_namespace *ns);
1810
task_pid_nr(struct task_struct * tsk)1811 static inline pid_t task_pid_nr(struct task_struct *tsk)
1812 {
1813 return tsk->pid;
1814 }
1815
task_pid_nr_ns(struct task_struct * tsk,struct pid_namespace * ns)1816 static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
1817 struct pid_namespace *ns)
1818 {
1819 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
1820 }
1821
task_pid_vnr(struct task_struct * tsk)1822 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1823 {
1824 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1825 }
1826
1827
task_tgid_nr(struct task_struct * tsk)1828 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1829 {
1830 return tsk->tgid;
1831 }
1832
1833 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1834
task_tgid_vnr(struct task_struct * tsk)1835 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1836 {
1837 return pid_vnr(task_tgid(tsk));
1838 }
1839
1840
1841 static inline int pid_alive(const struct task_struct *p);
task_ppid_nr_ns(const struct task_struct * tsk,struct pid_namespace * ns)1842 static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns)
1843 {
1844 pid_t pid = 0;
1845
1846 rcu_read_lock();
1847 if (pid_alive(tsk))
1848 pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns);
1849 rcu_read_unlock();
1850
1851 return pid;
1852 }
1853
task_ppid_nr(const struct task_struct * tsk)1854 static inline pid_t task_ppid_nr(const struct task_struct *tsk)
1855 {
1856 return task_ppid_nr_ns(tsk, &init_pid_ns);
1857 }
1858
task_pgrp_nr_ns(struct task_struct * tsk,struct pid_namespace * ns)1859 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
1860 struct pid_namespace *ns)
1861 {
1862 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
1863 }
1864
task_pgrp_vnr(struct task_struct * tsk)1865 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1866 {
1867 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
1868 }
1869
1870
task_session_nr_ns(struct task_struct * tsk,struct pid_namespace * ns)1871 static inline pid_t task_session_nr_ns(struct task_struct *tsk,
1872 struct pid_namespace *ns)
1873 {
1874 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
1875 }
1876
task_session_vnr(struct task_struct * tsk)1877 static inline pid_t task_session_vnr(struct task_struct *tsk)
1878 {
1879 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
1880 }
1881
1882 /* obsolete, do not use */
task_pgrp_nr(struct task_struct * tsk)1883 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1884 {
1885 return task_pgrp_nr_ns(tsk, &init_pid_ns);
1886 }
1887
1888 /**
1889 * pid_alive - check that a task structure is not stale
1890 * @p: Task structure to be checked.
1891 *
1892 * Test if a process is not yet dead (at most zombie state)
1893 * If pid_alive fails, then pointers within the task structure
1894 * can be stale and must not be dereferenced.
1895 *
1896 * Return: 1 if the process is alive. 0 otherwise.
1897 */
pid_alive(const struct task_struct * p)1898 static inline int pid_alive(const struct task_struct *p)
1899 {
1900 return p->pids[PIDTYPE_PID].pid != NULL;
1901 }
1902
1903 /**
1904 * is_global_init - check if a task structure is init
1905 * @tsk: Task structure to be checked.
1906 *
1907 * Check if a task structure is the first user space task the kernel created.
1908 *
1909 * Return: 1 if the task structure is init. 0 otherwise.
1910 */
is_global_init(struct task_struct * tsk)1911 static inline int is_global_init(struct task_struct *tsk)
1912 {
1913 return tsk->pid == 1;
1914 }
1915
1916 extern struct pid *cad_pid;
1917
1918 extern void free_task(struct task_struct *tsk);
1919 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1920
1921 extern void __put_task_struct(struct task_struct *t);
1922
put_task_struct(struct task_struct * t)1923 static inline void put_task_struct(struct task_struct *t)
1924 {
1925 if (atomic_dec_and_test(&t->usage))
1926 __put_task_struct(t);
1927 }
1928
1929 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1930 extern void task_cputime(struct task_struct *t,
1931 cputime_t *utime, cputime_t *stime);
1932 extern void task_cputime_scaled(struct task_struct *t,
1933 cputime_t *utimescaled, cputime_t *stimescaled);
1934 extern cputime_t task_gtime(struct task_struct *t);
1935 #else
task_cputime(struct task_struct * t,cputime_t * utime,cputime_t * stime)1936 static inline void task_cputime(struct task_struct *t,
1937 cputime_t *utime, cputime_t *stime)
1938 {
1939 if (utime)
1940 *utime = t->utime;
1941 if (stime)
1942 *stime = t->stime;
1943 }
1944
task_cputime_scaled(struct task_struct * t,cputime_t * utimescaled,cputime_t * stimescaled)1945 static inline void task_cputime_scaled(struct task_struct *t,
1946 cputime_t *utimescaled,
1947 cputime_t *stimescaled)
1948 {
1949 if (utimescaled)
1950 *utimescaled = t->utimescaled;
1951 if (stimescaled)
1952 *stimescaled = t->stimescaled;
1953 }
1954
task_gtime(struct task_struct * t)1955 static inline cputime_t task_gtime(struct task_struct *t)
1956 {
1957 return t->gtime;
1958 }
1959 #endif
1960 extern void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);
1961 extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);
1962
1963 /*
1964 * Per process flags
1965 */
1966 #define PF_EXITING 0x00000004 /* getting shut down */
1967 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1968 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1969 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1970 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1971 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
1972 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1973 #define PF_DUMPCORE 0x00000200 /* dumped core */
1974 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1975 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1976 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
1977 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1978 #define PF_USED_ASYNC 0x00004000 /* used async_schedule*(), used by module init */
1979 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1980 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1981 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1982 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1983 #define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */
1984 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1985 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1986 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1987 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1988 #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */
1989 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1990 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1991 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
1992 #define PF_SUSPEND_TASK 0x80000000 /* this thread called freeze_processes and should not be frozen */
1993
1994 /*
1995 * Only the _current_ task can read/write to tsk->flags, but other
1996 * tasks can access tsk->flags in readonly mode for example
1997 * with tsk_used_math (like during threaded core dumping).
1998 * There is however an exception to this rule during ptrace
1999 * or during fork: the ptracer task is allowed to write to the
2000 * child->flags of its traced child (same goes for fork, the parent
2001 * can write to the child->flags), because we're guaranteed the
2002 * child is not running and in turn not changing child->flags
2003 * at the same time the parent does it.
2004 */
2005 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
2006 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
2007 #define clear_used_math() clear_stopped_child_used_math(current)
2008 #define set_used_math() set_stopped_child_used_math(current)
2009 #define conditional_stopped_child_used_math(condition, child) \
2010 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
2011 #define conditional_used_math(condition) \
2012 conditional_stopped_child_used_math(condition, current)
2013 #define copy_to_stopped_child_used_math(child) \
2014 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
2015 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
2016 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
2017 #define used_math() tsk_used_math(current)
2018
2019 /* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags
2020 * __GFP_FS is also cleared as it implies __GFP_IO.
2021 */
memalloc_noio_flags(gfp_t flags)2022 static inline gfp_t memalloc_noio_flags(gfp_t flags)
2023 {
2024 if (unlikely(current->flags & PF_MEMALLOC_NOIO))
2025 flags &= ~(__GFP_IO | __GFP_FS);
2026 return flags;
2027 }
2028
memalloc_noio_save(void)2029 static inline unsigned int memalloc_noio_save(void)
2030 {
2031 unsigned int flags = current->flags & PF_MEMALLOC_NOIO;
2032 current->flags |= PF_MEMALLOC_NOIO;
2033 return flags;
2034 }
2035
memalloc_noio_restore(unsigned int flags)2036 static inline void memalloc_noio_restore(unsigned int flags)
2037 {
2038 current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags;
2039 }
2040
2041 /* Per-process atomic flags. */
2042 #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */
2043 #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */
2044 #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */
2045
2046
2047 #define TASK_PFA_TEST(name, func) \
2048 static inline bool task_##func(struct task_struct *p) \
2049 { return test_bit(PFA_##name, &p->atomic_flags); }
2050 #define TASK_PFA_SET(name, func) \
2051 static inline void task_set_##func(struct task_struct *p) \
2052 { set_bit(PFA_##name, &p->atomic_flags); }
2053 #define TASK_PFA_CLEAR(name, func) \
2054 static inline void task_clear_##func(struct task_struct *p) \
2055 { clear_bit(PFA_##name, &p->atomic_flags); }
2056
2057 TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs)
2058 TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs)
2059
2060 TASK_PFA_TEST(SPREAD_PAGE, spread_page)
2061 TASK_PFA_SET(SPREAD_PAGE, spread_page)
2062 TASK_PFA_CLEAR(SPREAD_PAGE, spread_page)
2063
2064 TASK_PFA_TEST(SPREAD_SLAB, spread_slab)
2065 TASK_PFA_SET(SPREAD_SLAB, spread_slab)
2066 TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab)
2067
2068 /*
2069 * task->jobctl flags
2070 */
2071 #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
2072
2073 #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
2074 #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
2075 #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
2076 #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
2077 #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
2078 #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
2079 #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
2080
2081 #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT)
2082 #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT)
2083 #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT)
2084 #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT)
2085 #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT)
2086 #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT)
2087 #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT)
2088
2089 #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
2090 #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
2091
2092 extern bool task_set_jobctl_pending(struct task_struct *task,
2093 unsigned int mask);
2094 extern void task_clear_jobctl_trapping(struct task_struct *task);
2095 extern void task_clear_jobctl_pending(struct task_struct *task,
2096 unsigned int mask);
2097
rcu_copy_process(struct task_struct * p)2098 static inline void rcu_copy_process(struct task_struct *p)
2099 {
2100 #ifdef CONFIG_PREEMPT_RCU
2101 p->rcu_read_lock_nesting = 0;
2102 p->rcu_read_unlock_special.s = 0;
2103 p->rcu_blocked_node = NULL;
2104 INIT_LIST_HEAD(&p->rcu_node_entry);
2105 #endif /* #ifdef CONFIG_PREEMPT_RCU */
2106 #ifdef CONFIG_TASKS_RCU
2107 p->rcu_tasks_holdout = false;
2108 INIT_LIST_HEAD(&p->rcu_tasks_holdout_list);
2109 p->rcu_tasks_idle_cpu = -1;
2110 #endif /* #ifdef CONFIG_TASKS_RCU */
2111 }
2112
tsk_restore_flags(struct task_struct * task,unsigned long orig_flags,unsigned long flags)2113 static inline void tsk_restore_flags(struct task_struct *task,
2114 unsigned long orig_flags, unsigned long flags)
2115 {
2116 task->flags &= ~flags;
2117 task->flags |= orig_flags & flags;
2118 }
2119
2120 extern int cpuset_cpumask_can_shrink(const struct cpumask *cur,
2121 const struct cpumask *trial);
2122 extern int task_can_attach(struct task_struct *p,
2123 const struct cpumask *cs_cpus_allowed);
2124 #ifdef CONFIG_SMP
2125 extern void do_set_cpus_allowed(struct task_struct *p,
2126 const struct cpumask *new_mask);
2127
2128 extern int set_cpus_allowed_ptr(struct task_struct *p,
2129 const struct cpumask *new_mask);
2130 #else
do_set_cpus_allowed(struct task_struct * p,const struct cpumask * new_mask)2131 static inline void do_set_cpus_allowed(struct task_struct *p,
2132 const struct cpumask *new_mask)
2133 {
2134 }
set_cpus_allowed_ptr(struct task_struct * p,const struct cpumask * new_mask)2135 static inline int set_cpus_allowed_ptr(struct task_struct *p,
2136 const struct cpumask *new_mask)
2137 {
2138 if (!cpumask_test_cpu(0, new_mask))
2139 return -EINVAL;
2140 return 0;
2141 }
2142 #endif
2143
2144 #ifdef CONFIG_NO_HZ_COMMON
2145 void calc_load_enter_idle(void);
2146 void calc_load_exit_idle(void);
2147 #else
calc_load_enter_idle(void)2148 static inline void calc_load_enter_idle(void) { }
calc_load_exit_idle(void)2149 static inline void calc_load_exit_idle(void) { }
2150 #endif /* CONFIG_NO_HZ_COMMON */
2151
2152 #ifndef CONFIG_CPUMASK_OFFSTACK
set_cpus_allowed(struct task_struct * p,cpumask_t new_mask)2153 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
2154 {
2155 return set_cpus_allowed_ptr(p, &new_mask);
2156 }
2157 #endif
2158
2159 /*
2160 * Do not use outside of architecture code which knows its limitations.
2161 *
2162 * sched_clock() has no promise of monotonicity or bounded drift between
2163 * CPUs, use (which you should not) requires disabling IRQs.
2164 *
2165 * Please use one of the three interfaces below.
2166 */
2167 extern unsigned long long notrace sched_clock(void);
2168 /*
2169 * See the comment in kernel/sched/clock.c
2170 */
2171 extern u64 cpu_clock(int cpu);
2172 extern u64 local_clock(void);
2173 extern u64 running_clock(void);
2174 extern u64 sched_clock_cpu(int cpu);
2175
2176
2177 extern void sched_clock_init(void);
2178
2179 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
sched_clock_tick(void)2180 static inline void sched_clock_tick(void)
2181 {
2182 }
2183
sched_clock_idle_sleep_event(void)2184 static inline void sched_clock_idle_sleep_event(void)
2185 {
2186 }
2187
sched_clock_idle_wakeup_event(u64 delta_ns)2188 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
2189 {
2190 }
2191 #else
2192 /*
2193 * Architectures can set this to 1 if they have specified
2194 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
2195 * but then during bootup it turns out that sched_clock()
2196 * is reliable after all:
2197 */
2198 extern int sched_clock_stable(void);
2199 extern void set_sched_clock_stable(void);
2200 extern void clear_sched_clock_stable(void);
2201
2202 extern void sched_clock_tick(void);
2203 extern void sched_clock_idle_sleep_event(void);
2204 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
2205 #endif
2206
2207 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
2208 /*
2209 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
2210 * The reason for this explicit opt-in is not to have perf penalty with
2211 * slow sched_clocks.
2212 */
2213 extern void enable_sched_clock_irqtime(void);
2214 extern void disable_sched_clock_irqtime(void);
2215 #else
enable_sched_clock_irqtime(void)2216 static inline void enable_sched_clock_irqtime(void) {}
disable_sched_clock_irqtime(void)2217 static inline void disable_sched_clock_irqtime(void) {}
2218 #endif
2219
2220 extern unsigned long long
2221 task_sched_runtime(struct task_struct *task);
2222
2223 /* sched_exec is called by processes performing an exec */
2224 #ifdef CONFIG_SMP
2225 extern void sched_exec(void);
2226 #else
2227 #define sched_exec() {}
2228 #endif
2229
2230 extern void sched_clock_idle_sleep_event(void);
2231 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
2232
2233 #ifdef CONFIG_HOTPLUG_CPU
2234 extern void idle_task_exit(void);
2235 #else
idle_task_exit(void)2236 static inline void idle_task_exit(void) {}
2237 #endif
2238
2239 #if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP)
2240 extern void wake_up_nohz_cpu(int cpu);
2241 #else
wake_up_nohz_cpu(int cpu)2242 static inline void wake_up_nohz_cpu(int cpu) { }
2243 #endif
2244
2245 #ifdef CONFIG_NO_HZ_FULL
2246 extern bool sched_can_stop_tick(void);
2247 extern u64 scheduler_tick_max_deferment(void);
2248 #else
sched_can_stop_tick(void)2249 static inline bool sched_can_stop_tick(void) { return false; }
2250 #endif
2251
2252 #ifdef CONFIG_SCHED_AUTOGROUP
2253 extern void sched_autogroup_create_attach(struct task_struct *p);
2254 extern void sched_autogroup_detach(struct task_struct *p);
2255 extern void sched_autogroup_fork(struct signal_struct *sig);
2256 extern void sched_autogroup_exit(struct signal_struct *sig);
2257 #ifdef CONFIG_PROC_FS
2258 extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m);
2259 extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice);
2260 #endif
2261 #else
sched_autogroup_create_attach(struct task_struct * p)2262 static inline void sched_autogroup_create_attach(struct task_struct *p) { }
sched_autogroup_detach(struct task_struct * p)2263 static inline void sched_autogroup_detach(struct task_struct *p) { }
sched_autogroup_fork(struct signal_struct * sig)2264 static inline void sched_autogroup_fork(struct signal_struct *sig) { }
sched_autogroup_exit(struct signal_struct * sig)2265 static inline void sched_autogroup_exit(struct signal_struct *sig) { }
2266 #endif
2267
2268 extern int yield_to(struct task_struct *p, bool preempt);
2269 extern void set_user_nice(struct task_struct *p, long nice);
2270 extern int task_prio(const struct task_struct *p);
2271 /**
2272 * task_nice - return the nice value of a given task.
2273 * @p: the task in question.
2274 *
2275 * Return: The nice value [ -20 ... 0 ... 19 ].
2276 */
task_nice(const struct task_struct * p)2277 static inline int task_nice(const struct task_struct *p)
2278 {
2279 return PRIO_TO_NICE((p)->static_prio);
2280 }
2281 extern int can_nice(const struct task_struct *p, const int nice);
2282 extern int task_curr(const struct task_struct *p);
2283 extern int idle_cpu(int cpu);
2284 extern int sched_setscheduler(struct task_struct *, int,
2285 const struct sched_param *);
2286 extern int sched_setscheduler_nocheck(struct task_struct *, int,
2287 const struct sched_param *);
2288 extern int sched_setattr(struct task_struct *,
2289 const struct sched_attr *);
2290 extern struct task_struct *idle_task(int cpu);
2291 /**
2292 * is_idle_task - is the specified task an idle task?
2293 * @p: the task in question.
2294 *
2295 * Return: 1 if @p is an idle task. 0 otherwise.
2296 */
is_idle_task(const struct task_struct * p)2297 static inline bool is_idle_task(const struct task_struct *p)
2298 {
2299 return p->pid == 0;
2300 }
2301 extern struct task_struct *curr_task(int cpu);
2302 extern void set_curr_task(int cpu, struct task_struct *p);
2303
2304 void yield(void);
2305
2306 union thread_union {
2307 struct thread_info thread_info;
2308 unsigned long stack[THREAD_SIZE/sizeof(long)];
2309 };
2310
2311 #ifndef __HAVE_ARCH_KSTACK_END
kstack_end(void * addr)2312 static inline int kstack_end(void *addr)
2313 {
2314 /* Reliable end of stack detection:
2315 * Some APM bios versions misalign the stack
2316 */
2317 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
2318 }
2319 #endif
2320
2321 extern union thread_union init_thread_union;
2322 extern struct task_struct init_task;
2323
2324 extern struct mm_struct init_mm;
2325
2326 extern struct pid_namespace init_pid_ns;
2327
2328 /*
2329 * find a task by one of its numerical ids
2330 *
2331 * find_task_by_pid_ns():
2332 * finds a task by its pid in the specified namespace
2333 * find_task_by_vpid():
2334 * finds a task by its virtual pid
2335 *
2336 * see also find_vpid() etc in include/linux/pid.h
2337 */
2338
2339 extern struct task_struct *find_task_by_vpid(pid_t nr);
2340 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
2341 struct pid_namespace *ns);
2342
2343 /* per-UID process charging. */
2344 extern struct user_struct * alloc_uid(kuid_t);
get_uid(struct user_struct * u)2345 static inline struct user_struct *get_uid(struct user_struct *u)
2346 {
2347 atomic_inc(&u->__count);
2348 return u;
2349 }
2350 extern void free_uid(struct user_struct *);
2351
2352 #include <asm/current.h>
2353
2354 extern void xtime_update(unsigned long ticks);
2355
2356 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
2357 extern int wake_up_process(struct task_struct *tsk);
2358 extern void wake_up_new_task(struct task_struct *tsk);
2359 #ifdef CONFIG_SMP
2360 extern void kick_process(struct task_struct *tsk);
2361 #else
kick_process(struct task_struct * tsk)2362 static inline void kick_process(struct task_struct *tsk) { }
2363 #endif
2364 extern int sched_fork(unsigned long clone_flags, struct task_struct *p);
2365 extern void sched_dead(struct task_struct *p);
2366
2367 extern void proc_caches_init(void);
2368 extern void flush_signals(struct task_struct *);
2369 extern void __flush_signals(struct task_struct *);
2370 extern void ignore_signals(struct task_struct *);
2371 extern void flush_signal_handlers(struct task_struct *, int force_default);
2372 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
2373
dequeue_signal_lock(struct task_struct * tsk,sigset_t * mask,siginfo_t * info)2374 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
2375 {
2376 unsigned long flags;
2377 int ret;
2378
2379 spin_lock_irqsave(&tsk->sighand->siglock, flags);
2380 ret = dequeue_signal(tsk, mask, info);
2381 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
2382
2383 return ret;
2384 }
2385
2386 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
2387 sigset_t *mask);
2388 extern void unblock_all_signals(void);
2389 extern void release_task(struct task_struct * p);
2390 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
2391 extern int force_sigsegv(int, struct task_struct *);
2392 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
2393 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
2394 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2395 extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *,
2396 const struct cred *, u32);
2397 extern int kill_pgrp(struct pid *pid, int sig, int priv);
2398 extern int kill_pid(struct pid *pid, int sig, int priv);
2399 extern int kill_proc_info(int, struct siginfo *, pid_t);
2400 extern __must_check bool do_notify_parent(struct task_struct *, int);
2401 extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
2402 extern void force_sig(int, struct task_struct *);
2403 extern int send_sig(int, struct task_struct *, int);
2404 extern int zap_other_threads(struct task_struct *p);
2405 extern struct sigqueue *sigqueue_alloc(void);
2406 extern void sigqueue_free(struct sigqueue *);
2407 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
2408 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
2409
restore_saved_sigmask(void)2410 static inline void restore_saved_sigmask(void)
2411 {
2412 if (test_and_clear_restore_sigmask())
2413 __set_current_blocked(¤t->saved_sigmask);
2414 }
2415
sigmask_to_save(void)2416 static inline sigset_t *sigmask_to_save(void)
2417 {
2418 sigset_t *res = ¤t->blocked;
2419 if (unlikely(test_restore_sigmask()))
2420 res = ¤t->saved_sigmask;
2421 return res;
2422 }
2423
kill_cad_pid(int sig,int priv)2424 static inline int kill_cad_pid(int sig, int priv)
2425 {
2426 return kill_pid(cad_pid, sig, priv);
2427 }
2428
2429 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2430 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2431 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2432 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2433
2434 /*
2435 * True if we are on the alternate signal stack.
2436 */
on_sig_stack(unsigned long sp)2437 static inline int on_sig_stack(unsigned long sp)
2438 {
2439 #ifdef CONFIG_STACK_GROWSUP
2440 return sp >= current->sas_ss_sp &&
2441 sp - current->sas_ss_sp < current->sas_ss_size;
2442 #else
2443 return sp > current->sas_ss_sp &&
2444 sp - current->sas_ss_sp <= current->sas_ss_size;
2445 #endif
2446 }
2447
sas_ss_flags(unsigned long sp)2448 static inline int sas_ss_flags(unsigned long sp)
2449 {
2450 if (!current->sas_ss_size)
2451 return SS_DISABLE;
2452
2453 return on_sig_stack(sp) ? SS_ONSTACK : 0;
2454 }
2455
sigsp(unsigned long sp,struct ksignal * ksig)2456 static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig)
2457 {
2458 if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp))
2459 #ifdef CONFIG_STACK_GROWSUP
2460 return current->sas_ss_sp;
2461 #else
2462 return current->sas_ss_sp + current->sas_ss_size;
2463 #endif
2464 return sp;
2465 }
2466
2467 /*
2468 * Routines for handling mm_structs
2469 */
2470 extern struct mm_struct * mm_alloc(void);
2471
2472 /* mmdrop drops the mm and the page tables */
2473 extern void __mmdrop(struct mm_struct *);
mmdrop(struct mm_struct * mm)2474 static inline void mmdrop(struct mm_struct * mm)
2475 {
2476 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
2477 __mmdrop(mm);
2478 }
2479
2480 /* mmput gets rid of the mappings and all user-space */
2481 extern void mmput(struct mm_struct *);
2482 /* Grab a reference to a task's mm, if it is not already going away */
2483 extern struct mm_struct *get_task_mm(struct task_struct *task);
2484 /*
2485 * Grab a reference to a task's mm, if it is not already going away
2486 * and ptrace_may_access with the mode parameter passed to it
2487 * succeeds.
2488 */
2489 extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode);
2490 /* Remove the current tasks stale references to the old mm_struct */
2491 extern void mm_release(struct task_struct *, struct mm_struct *);
2492
2493 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2494 struct task_struct *);
2495 extern void flush_thread(void);
2496 extern void exit_thread(void);
2497
2498 extern void exit_files(struct task_struct *);
2499 extern void __cleanup_sighand(struct sighand_struct *);
2500
2501 extern void exit_itimers(struct signal_struct *);
2502 extern void flush_itimer_signals(void);
2503
2504 extern void do_group_exit(int);
2505
2506 extern int do_execve(struct filename *,
2507 const char __user * const __user *,
2508 const char __user * const __user *);
2509 extern int do_execveat(int, struct filename *,
2510 const char __user * const __user *,
2511 const char __user * const __user *,
2512 int);
2513 extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *);
2514 struct task_struct *fork_idle(int);
2515 extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
2516
2517 extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec);
set_task_comm(struct task_struct * tsk,const char * from)2518 static inline void set_task_comm(struct task_struct *tsk, const char *from)
2519 {
2520 __set_task_comm(tsk, from, false);
2521 }
2522 extern char *get_task_comm(char *to, struct task_struct *tsk);
2523
2524 #ifdef CONFIG_SMP
2525 void scheduler_ipi(void);
2526 extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
2527 #else
scheduler_ipi(void)2528 static inline void scheduler_ipi(void) { }
wait_task_inactive(struct task_struct * p,long match_state)2529 static inline unsigned long wait_task_inactive(struct task_struct *p,
2530 long match_state)
2531 {
2532 return 1;
2533 }
2534 #endif
2535
2536 #define next_task(p) \
2537 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2538
2539 #define for_each_process(p) \
2540 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2541
2542 extern bool current_is_single_threaded(void);
2543
2544 /*
2545 * Careful: do_each_thread/while_each_thread is a double loop so
2546 * 'break' will not work as expected - use goto instead.
2547 */
2548 #define do_each_thread(g, t) \
2549 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2550
2551 #define while_each_thread(g, t) \
2552 while ((t = next_thread(t)) != g)
2553
2554 #define __for_each_thread(signal, t) \
2555 list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node)
2556
2557 #define for_each_thread(p, t) \
2558 __for_each_thread((p)->signal, t)
2559
2560 /* Careful: this is a double loop, 'break' won't work as expected. */
2561 #define for_each_process_thread(p, t) \
2562 for_each_process(p) for_each_thread(p, t)
2563
get_nr_threads(struct task_struct * tsk)2564 static inline int get_nr_threads(struct task_struct *tsk)
2565 {
2566 return tsk->signal->nr_threads;
2567 }
2568
thread_group_leader(struct task_struct * p)2569 static inline bool thread_group_leader(struct task_struct *p)
2570 {
2571 return p->exit_signal >= 0;
2572 }
2573
2574 /* Do to the insanities of de_thread it is possible for a process
2575 * to have the pid of the thread group leader without actually being
2576 * the thread group leader. For iteration through the pids in proc
2577 * all we care about is that we have a task with the appropriate
2578 * pid, we don't actually care if we have the right task.
2579 */
has_group_leader_pid(struct task_struct * p)2580 static inline bool has_group_leader_pid(struct task_struct *p)
2581 {
2582 return task_pid(p) == p->signal->leader_pid;
2583 }
2584
2585 static inline
same_thread_group(struct task_struct * p1,struct task_struct * p2)2586 bool same_thread_group(struct task_struct *p1, struct task_struct *p2)
2587 {
2588 return p1->signal == p2->signal;
2589 }
2590
next_thread(const struct task_struct * p)2591 static inline struct task_struct *next_thread(const struct task_struct *p)
2592 {
2593 return list_entry_rcu(p->thread_group.next,
2594 struct task_struct, thread_group);
2595 }
2596
thread_group_empty(struct task_struct * p)2597 static inline int thread_group_empty(struct task_struct *p)
2598 {
2599 return list_empty(&p->thread_group);
2600 }
2601
2602 #define delay_group_leader(p) \
2603 (thread_group_leader(p) && !thread_group_empty(p))
2604
2605 /*
2606 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2607 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2608 * pins the final release of task.io_context. Also protects ->cpuset and
2609 * ->cgroup.subsys[]. And ->vfork_done.
2610 *
2611 * Nests both inside and outside of read_lock(&tasklist_lock).
2612 * It must not be nested with write_lock_irq(&tasklist_lock),
2613 * neither inside nor outside.
2614 */
task_lock(struct task_struct * p)2615 static inline void task_lock(struct task_struct *p)
2616 {
2617 spin_lock(&p->alloc_lock);
2618 }
2619
task_unlock(struct task_struct * p)2620 static inline void task_unlock(struct task_struct *p)
2621 {
2622 spin_unlock(&p->alloc_lock);
2623 }
2624
2625 extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
2626 unsigned long *flags);
2627
lock_task_sighand(struct task_struct * tsk,unsigned long * flags)2628 static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
2629 unsigned long *flags)
2630 {
2631 struct sighand_struct *ret;
2632
2633 ret = __lock_task_sighand(tsk, flags);
2634 (void)__cond_lock(&tsk->sighand->siglock, ret);
2635 return ret;
2636 }
2637
unlock_task_sighand(struct task_struct * tsk,unsigned long * flags)2638 static inline void unlock_task_sighand(struct task_struct *tsk,
2639 unsigned long *flags)
2640 {
2641 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2642 }
2643
2644 #ifdef CONFIG_CGROUPS
threadgroup_change_begin(struct task_struct * tsk)2645 static inline void threadgroup_change_begin(struct task_struct *tsk)
2646 {
2647 down_read(&tsk->signal->group_rwsem);
2648 }
threadgroup_change_end(struct task_struct * tsk)2649 static inline void threadgroup_change_end(struct task_struct *tsk)
2650 {
2651 up_read(&tsk->signal->group_rwsem);
2652 }
2653
2654 /**
2655 * threadgroup_lock - lock threadgroup
2656 * @tsk: member task of the threadgroup to lock
2657 *
2658 * Lock the threadgroup @tsk belongs to. No new task is allowed to enter
2659 * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
2660 * change ->group_leader/pid. This is useful for cases where the threadgroup
2661 * needs to stay stable across blockable operations.
2662 *
2663 * fork and exit paths explicitly call threadgroup_change_{begin|end}() for
2664 * synchronization. While held, no new task will be added to threadgroup
2665 * and no existing live task will have its PF_EXITING set.
2666 *
2667 * de_thread() does threadgroup_change_{begin|end}() when a non-leader
2668 * sub-thread becomes a new leader.
2669 */
threadgroup_lock(struct task_struct * tsk)2670 static inline void threadgroup_lock(struct task_struct *tsk)
2671 {
2672 down_write(&tsk->signal->group_rwsem);
2673 }
2674
2675 /**
2676 * threadgroup_unlock - unlock threadgroup
2677 * @tsk: member task of the threadgroup to unlock
2678 *
2679 * Reverse threadgroup_lock().
2680 */
threadgroup_unlock(struct task_struct * tsk)2681 static inline void threadgroup_unlock(struct task_struct *tsk)
2682 {
2683 up_write(&tsk->signal->group_rwsem);
2684 }
2685 #else
threadgroup_change_begin(struct task_struct * tsk)2686 static inline void threadgroup_change_begin(struct task_struct *tsk) {}
threadgroup_change_end(struct task_struct * tsk)2687 static inline void threadgroup_change_end(struct task_struct *tsk) {}
threadgroup_lock(struct task_struct * tsk)2688 static inline void threadgroup_lock(struct task_struct *tsk) {}
threadgroup_unlock(struct task_struct * tsk)2689 static inline void threadgroup_unlock(struct task_struct *tsk) {}
2690 #endif
2691
2692 #ifndef __HAVE_THREAD_FUNCTIONS
2693
2694 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2695 #define task_stack_page(task) ((task)->stack)
2696
setup_thread_stack(struct task_struct * p,struct task_struct * org)2697 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2698 {
2699 *task_thread_info(p) = *task_thread_info(org);
2700 task_thread_info(p)->task = p;
2701 }
2702
2703 /*
2704 * Return the address of the last usable long on the stack.
2705 *
2706 * When the stack grows down, this is just above the thread
2707 * info struct. Going any lower will corrupt the threadinfo.
2708 *
2709 * When the stack grows up, this is the highest address.
2710 * Beyond that position, we corrupt data on the next page.
2711 */
end_of_stack(struct task_struct * p)2712 static inline unsigned long *end_of_stack(struct task_struct *p)
2713 {
2714 #ifdef CONFIG_STACK_GROWSUP
2715 return (unsigned long *)((unsigned long)task_thread_info(p) + THREAD_SIZE) - 1;
2716 #else
2717 return (unsigned long *)(task_thread_info(p) + 1);
2718 #endif
2719 }
2720
2721 #endif
2722 #define task_stack_end_corrupted(task) \
2723 (*(end_of_stack(task)) != STACK_END_MAGIC)
2724
object_is_on_stack(void * obj)2725 static inline int object_is_on_stack(void *obj)
2726 {
2727 void *stack = task_stack_page(current);
2728
2729 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2730 }
2731
2732 extern void thread_info_cache_init(void);
2733
2734 #ifdef CONFIG_DEBUG_STACK_USAGE
stack_not_used(struct task_struct * p)2735 static inline unsigned long stack_not_used(struct task_struct *p)
2736 {
2737 unsigned long *n = end_of_stack(p);
2738
2739 do { /* Skip over canary */
2740 n++;
2741 } while (!*n);
2742
2743 return (unsigned long)n - (unsigned long)end_of_stack(p);
2744 }
2745 #endif
2746 extern void set_task_stack_end_magic(struct task_struct *tsk);
2747
2748 /* set thread flags in other task's structures
2749 * - see asm/thread_info.h for TIF_xxxx flags available
2750 */
set_tsk_thread_flag(struct task_struct * tsk,int flag)2751 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2752 {
2753 set_ti_thread_flag(task_thread_info(tsk), flag);
2754 }
2755
clear_tsk_thread_flag(struct task_struct * tsk,int flag)2756 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2757 {
2758 clear_ti_thread_flag(task_thread_info(tsk), flag);
2759 }
2760
test_and_set_tsk_thread_flag(struct task_struct * tsk,int flag)2761 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2762 {
2763 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2764 }
2765
test_and_clear_tsk_thread_flag(struct task_struct * tsk,int flag)2766 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2767 {
2768 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2769 }
2770
test_tsk_thread_flag(struct task_struct * tsk,int flag)2771 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2772 {
2773 return test_ti_thread_flag(task_thread_info(tsk), flag);
2774 }
2775
set_tsk_need_resched(struct task_struct * tsk)2776 static inline void set_tsk_need_resched(struct task_struct *tsk)
2777 {
2778 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2779 }
2780
clear_tsk_need_resched(struct task_struct * tsk)2781 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2782 {
2783 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2784 }
2785
test_tsk_need_resched(struct task_struct * tsk)2786 static inline int test_tsk_need_resched(struct task_struct *tsk)
2787 {
2788 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2789 }
2790
restart_syscall(void)2791 static inline int restart_syscall(void)
2792 {
2793 set_tsk_thread_flag(current, TIF_SIGPENDING);
2794 return -ERESTARTNOINTR;
2795 }
2796
signal_pending(struct task_struct * p)2797 static inline int signal_pending(struct task_struct *p)
2798 {
2799 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2800 }
2801
__fatal_signal_pending(struct task_struct * p)2802 static inline int __fatal_signal_pending(struct task_struct *p)
2803 {
2804 return unlikely(sigismember(&p->pending.signal, SIGKILL));
2805 }
2806
fatal_signal_pending(struct task_struct * p)2807 static inline int fatal_signal_pending(struct task_struct *p)
2808 {
2809 return signal_pending(p) && __fatal_signal_pending(p);
2810 }
2811
signal_pending_state(long state,struct task_struct * p)2812 static inline int signal_pending_state(long state, struct task_struct *p)
2813 {
2814 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2815 return 0;
2816 if (!signal_pending(p))
2817 return 0;
2818
2819 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2820 }
2821
2822 /*
2823 * cond_resched() and cond_resched_lock(): latency reduction via
2824 * explicit rescheduling in places that are safe. The return
2825 * value indicates whether a reschedule was done in fact.
2826 * cond_resched_lock() will drop the spinlock before scheduling,
2827 * cond_resched_softirq() will enable bhs before scheduling.
2828 */
2829 extern int _cond_resched(void);
2830
2831 #define cond_resched() ({ \
2832 ___might_sleep(__FILE__, __LINE__, 0); \
2833 _cond_resched(); \
2834 })
2835
2836 extern int __cond_resched_lock(spinlock_t *lock);
2837
2838 #define cond_resched_lock(lock) ({ \
2839 ___might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);\
2840 __cond_resched_lock(lock); \
2841 })
2842
2843 extern int __cond_resched_softirq(void);
2844
2845 #define cond_resched_softirq() ({ \
2846 ___might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
2847 __cond_resched_softirq(); \
2848 })
2849
cond_resched_rcu(void)2850 static inline void cond_resched_rcu(void)
2851 {
2852 #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU)
2853 rcu_read_unlock();
2854 cond_resched();
2855 rcu_read_lock();
2856 #endif
2857 }
2858
2859 /*
2860 * Does a critical section need to be broken due to another
2861 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2862 * but a general need for low latency)
2863 */
spin_needbreak(spinlock_t * lock)2864 static inline int spin_needbreak(spinlock_t *lock)
2865 {
2866 #ifdef CONFIG_PREEMPT
2867 return spin_is_contended(lock);
2868 #else
2869 return 0;
2870 #endif
2871 }
2872
2873 /*
2874 * Idle thread specific functions to determine the need_resched
2875 * polling state.
2876 */
2877 #ifdef TIF_POLLING_NRFLAG
tsk_is_polling(struct task_struct * p)2878 static inline int tsk_is_polling(struct task_struct *p)
2879 {
2880 return test_tsk_thread_flag(p, TIF_POLLING_NRFLAG);
2881 }
2882
__current_set_polling(void)2883 static inline void __current_set_polling(void)
2884 {
2885 set_thread_flag(TIF_POLLING_NRFLAG);
2886 }
2887
current_set_polling_and_test(void)2888 static inline bool __must_check current_set_polling_and_test(void)
2889 {
2890 __current_set_polling();
2891
2892 /*
2893 * Polling state must be visible before we test NEED_RESCHED,
2894 * paired by resched_curr()
2895 */
2896 smp_mb__after_atomic();
2897
2898 return unlikely(tif_need_resched());
2899 }
2900
__current_clr_polling(void)2901 static inline void __current_clr_polling(void)
2902 {
2903 clear_thread_flag(TIF_POLLING_NRFLAG);
2904 }
2905
current_clr_polling_and_test(void)2906 static inline bool __must_check current_clr_polling_and_test(void)
2907 {
2908 __current_clr_polling();
2909
2910 /*
2911 * Polling state must be visible before we test NEED_RESCHED,
2912 * paired by resched_curr()
2913 */
2914 smp_mb__after_atomic();
2915
2916 return unlikely(tif_need_resched());
2917 }
2918
2919 #else
tsk_is_polling(struct task_struct * p)2920 static inline int tsk_is_polling(struct task_struct *p) { return 0; }
__current_set_polling(void)2921 static inline void __current_set_polling(void) { }
__current_clr_polling(void)2922 static inline void __current_clr_polling(void) { }
2923
current_set_polling_and_test(void)2924 static inline bool __must_check current_set_polling_and_test(void)
2925 {
2926 return unlikely(tif_need_resched());
2927 }
current_clr_polling_and_test(void)2928 static inline bool __must_check current_clr_polling_and_test(void)
2929 {
2930 return unlikely(tif_need_resched());
2931 }
2932 #endif
2933
current_clr_polling(void)2934 static inline void current_clr_polling(void)
2935 {
2936 __current_clr_polling();
2937
2938 /*
2939 * Ensure we check TIF_NEED_RESCHED after we clear the polling bit.
2940 * Once the bit is cleared, we'll get IPIs with every new
2941 * TIF_NEED_RESCHED and the IPI handler, scheduler_ipi(), will also
2942 * fold.
2943 */
2944 smp_mb(); /* paired with resched_curr() */
2945
2946 preempt_fold_need_resched();
2947 }
2948
need_resched(void)2949 static __always_inline bool need_resched(void)
2950 {
2951 return unlikely(tif_need_resched());
2952 }
2953
2954 /*
2955 * Thread group CPU time accounting.
2956 */
2957 void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
2958 void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
2959
thread_group_cputime_init(struct signal_struct * sig)2960 static inline void thread_group_cputime_init(struct signal_struct *sig)
2961 {
2962 raw_spin_lock_init(&sig->cputimer.lock);
2963 }
2964
2965 /*
2966 * Reevaluate whether the task has signals pending delivery.
2967 * Wake the task if so.
2968 * This is required every time the blocked sigset_t changes.
2969 * callers must hold sighand->siglock.
2970 */
2971 extern void recalc_sigpending_and_wake(struct task_struct *t);
2972 extern void recalc_sigpending(void);
2973
2974 extern void signal_wake_up_state(struct task_struct *t, unsigned int state);
2975
signal_wake_up(struct task_struct * t,bool resume)2976 static inline void signal_wake_up(struct task_struct *t, bool resume)
2977 {
2978 signal_wake_up_state(t, resume ? TASK_WAKEKILL : 0);
2979 }
ptrace_signal_wake_up(struct task_struct * t,bool resume)2980 static inline void ptrace_signal_wake_up(struct task_struct *t, bool resume)
2981 {
2982 signal_wake_up_state(t, resume ? __TASK_TRACED : 0);
2983 }
2984
2985 /*
2986 * Wrappers for p->thread_info->cpu access. No-op on UP.
2987 */
2988 #ifdef CONFIG_SMP
2989
task_cpu(const struct task_struct * p)2990 static inline unsigned int task_cpu(const struct task_struct *p)
2991 {
2992 return task_thread_info(p)->cpu;
2993 }
2994
task_node(const struct task_struct * p)2995 static inline int task_node(const struct task_struct *p)
2996 {
2997 return cpu_to_node(task_cpu(p));
2998 }
2999
3000 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
3001
3002 #else
3003
task_cpu(const struct task_struct * p)3004 static inline unsigned int task_cpu(const struct task_struct *p)
3005 {
3006 return 0;
3007 }
3008
set_task_cpu(struct task_struct * p,unsigned int cpu)3009 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
3010 {
3011 }
3012
3013 #endif /* CONFIG_SMP */
3014
3015 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
3016 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
3017
3018 #ifdef CONFIG_CGROUP_SCHED
3019 extern struct task_group root_task_group;
3020 #endif /* CONFIG_CGROUP_SCHED */
3021
3022 extern int task_can_switch_user(struct user_struct *up,
3023 struct task_struct *tsk);
3024
3025 #ifdef CONFIG_TASK_XACCT
add_rchar(struct task_struct * tsk,ssize_t amt)3026 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
3027 {
3028 tsk->ioac.rchar += amt;
3029 }
3030
add_wchar(struct task_struct * tsk,ssize_t amt)3031 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
3032 {
3033 tsk->ioac.wchar += amt;
3034 }
3035
inc_syscr(struct task_struct * tsk)3036 static inline void inc_syscr(struct task_struct *tsk)
3037 {
3038 tsk->ioac.syscr++;
3039 }
3040
inc_syscw(struct task_struct * tsk)3041 static inline void inc_syscw(struct task_struct *tsk)
3042 {
3043 tsk->ioac.syscw++;
3044 }
3045 #else
add_rchar(struct task_struct * tsk,ssize_t amt)3046 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
3047 {
3048 }
3049
add_wchar(struct task_struct * tsk,ssize_t amt)3050 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
3051 {
3052 }
3053
inc_syscr(struct task_struct * tsk)3054 static inline void inc_syscr(struct task_struct *tsk)
3055 {
3056 }
3057
inc_syscw(struct task_struct * tsk)3058 static inline void inc_syscw(struct task_struct *tsk)
3059 {
3060 }
3061 #endif
3062
3063 #ifndef TASK_SIZE_OF
3064 #define TASK_SIZE_OF(tsk) TASK_SIZE
3065 #endif
3066
3067 #ifdef CONFIG_MEMCG
3068 extern void mm_update_next_owner(struct mm_struct *mm);
3069 #else
mm_update_next_owner(struct mm_struct * mm)3070 static inline void mm_update_next_owner(struct mm_struct *mm)
3071 {
3072 }
3073 #endif /* CONFIG_MEMCG */
3074
task_rlimit(const struct task_struct * tsk,unsigned int limit)3075 static inline unsigned long task_rlimit(const struct task_struct *tsk,
3076 unsigned int limit)
3077 {
3078 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
3079 }
3080
task_rlimit_max(const struct task_struct * tsk,unsigned int limit)3081 static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
3082 unsigned int limit)
3083 {
3084 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
3085 }
3086
rlimit(unsigned int limit)3087 static inline unsigned long rlimit(unsigned int limit)
3088 {
3089 return task_rlimit(current, limit);
3090 }
3091
rlimit_max(unsigned int limit)3092 static inline unsigned long rlimit_max(unsigned int limit)
3093 {
3094 return task_rlimit_max(current, limit);
3095 }
3096
3097 #endif
3098