root/include/linux/module.h

INCLUDED FROM

DEFINITIONS

1. kallsyms_symbol_value
2. module_is_live
3. within_module_core
4. within_module_init
5. within_module
6. try_module_get
7. module_put
8. __module_get
9. module_requested_async_probing
10. is_livepatch_module
11. is_livepatch_module
12. __module_address
13. __module_text_address
14. is_module_address
15. is_module_percpu_address
16. __is_module_percpu_address
17. is_module_text_address
18. within_module_core
19. within_module_init
20. within_module
21. __module_get
22. try_module_get
23. module_put
24. module_address_lookup
25. lookup_module_symbol_name
26. lookup_module_symbol_attrs
27. module_get_kallsym
28. module_kallsyms_lookup_name
29. module_kallsyms_on_each_symbol
30. register_module_notifier
31. unregister_module_notifier
32. print_modules
33. module_requested_async_probing
34. is_module_sig_enforced
35. set_module_sig_enforced
36. dereference_module_function_descriptor
37. set_all_modules_text_rw
38. set_all_modules_text_ro
39. module_enable_ro
40. module_disable_ro
41. module_bug_finalize
42. module_bug_cleanup
43. retpoline_module_ok
44. module_sig_ok
45. module_sig_ok

   1 #ifndef _LINUX_MODULE_H
   2 #define _LINUX_MODULE_H
   3 /*
   4  * Dynamic loading of modules into the kernel.
   5  *
   6  * Rewritten by Richard Henderson <rth@tamu.edu> Dec 1996
   7  * Rewritten again by Rusty Russell, 2002
   8  */
   9 #include <linux/list.h>
  10 #include <linux/stat.h>
  11 #include <linux/compiler.h>
  12 #include <linux/cache.h>
  13 #include <linux/kmod.h>
  14 #include <linux/init.h>
  15 #include <linux/elf.h>
  16 #include <linux/stringify.h>
  17 #include <linux/kobject.h>
  18 #include <linux/moduleparam.h>
  19 #include <linux/jump_label.h>
  20 #include <linux/export.h>
  21 #include <linux/rbtree_latch.h>
  22 #include <linux/error-injection.h>
  23 #include <linux/tracepoint-defs.h>
  24 #include <linux/srcu.h>
  25 
  26 #include <linux/percpu.h>
  27 #include <asm/module.h>
  28 
  29 /* Not Yet Implemented */
  30 #define MODULE_SUPPORTED_DEVICE(name)
  31 
  32 #define MODULE_NAME_LEN MAX_PARAM_PREFIX_LEN
  33 
  34 struct modversion_info {
  35         unsigned long crc;
  36         char name[MODULE_NAME_LEN];
  37 };
  38 
  39 struct module;
  40 struct exception_table_entry;
  41 
  42 struct module_kobject {
  43         struct kobject kobj;
  44         struct module *mod;
  45         struct kobject *drivers_dir;
  46         struct module_param_attrs *mp;
  47         struct completion *kobj_completion;
  48 } __randomize_layout;
  49 
  50 struct module_attribute {
  51         struct attribute attr;
  52         ssize_t (*show)(struct module_attribute *, struct module_kobject *,
  53                         char *);
  54         ssize_t (*store)(struct module_attribute *, struct module_kobject *,
  55                          const char *, size_t count);
  56         void (*setup)(struct module *, const char *);
  57         int (*test)(struct module *);
  58         void (*free)(struct module *);
  59 };
  60 
  61 struct module_version_attribute {
  62         struct module_attribute mattr;
  63         const char *module_name;
  64         const char *version;
  65 } __attribute__ ((__aligned__(sizeof(void *))));
  66 
  67 extern ssize_t __modver_version_show(struct module_attribute *,
  68                                      struct module_kobject *, char *);
  69 
  70 extern struct module_attribute module_uevent;
  71 
  72 /* These are either module local, or the kernel's dummy ones. */
  73 extern int init_module(void);
  74 extern void cleanup_module(void);
  75 
  76 #ifndef MODULE
  77 /**
  78  * module_init() - driver initialization entry point
  79  * @x: function to be run at kernel boot time or module insertion
  80  *
  81  * module_init() will either be called during do_initcalls() (if
  82  * builtin) or at module insertion time (if a module).  There can only
  83  * be one per module.
  84  */
  85 #define module_init(x)  __initcall(x);
  86 
  87 /**
  88  * module_exit() - driver exit entry point
  89  * @x: function to be run when driver is removed
  90  *
  91  * module_exit() will wrap the driver clean-up code
  92  * with cleanup_module() when used with rmmod when
  93  * the driver is a module.  If the driver is statically
  94  * compiled into the kernel, module_exit() has no effect.
  95  * There can only be one per module.
  96  */
  97 #define module_exit(x)  __exitcall(x);
  98 
  99 #else /* MODULE */
 100 
 101 /*
 102  * In most cases loadable modules do not need custom
 103  * initcall levels. There are still some valid cases where
 104  * a driver may be needed early if built in, and does not
 105  * matter when built as a loadable module. Like bus
 106  * snooping debug drivers.
 107  */
 108 #define early_initcall(fn)              module_init(fn)
 109 #define core_initcall(fn)               module_init(fn)
 110 #define core_initcall_sync(fn)          module_init(fn)
 111 #define postcore_initcall(fn)           module_init(fn)
 112 #define postcore_initcall_sync(fn)      module_init(fn)
 113 #define arch_initcall(fn)               module_init(fn)
 114 #define subsys_initcall(fn)             module_init(fn)
 115 #define subsys_initcall_sync(fn)        module_init(fn)
 116 #define fs_initcall(fn)                 module_init(fn)
 117 #define fs_initcall_sync(fn)            module_init(fn)
 118 #define rootfs_initcall(fn)             module_init(fn)
 119 #define device_initcall(fn)             module_init(fn)
 120 #define device_initcall_sync(fn)        module_init(fn)
 121 #define late_initcall(fn)               module_init(fn)
 122 #define late_initcall_sync(fn)          module_init(fn)
 123 
 124 #define console_initcall(fn)            module_init(fn)
 125 
 126 /* Each module must use one module_init(). */
 127 #define module_init(initfn)                                     \
 128         static inline initcall_t __maybe_unused __inittest(void)                \
 129         { return initfn; }                                      \
 130         int init_module(void) __copy(initfn) __attribute__((alias(#initfn)));
 131 
 132 /* This is only required if you want to be unloadable. */
 133 #define module_exit(exitfn)                                     \
 134         static inline exitcall_t __maybe_unused __exittest(void)                \
 135         { return exitfn; }                                      \
 136         void cleanup_module(void) __copy(exitfn) __attribute__((alias(#exitfn)));
 137 
 138 #endif
 139 
 140 /* This means "can be init if no module support, otherwise module load
 141    may call it." */
 142 #ifdef CONFIG_MODULES
 143 #define __init_or_module
 144 #define __initdata_or_module
 145 #define __initconst_or_module
 146 #define __INIT_OR_MODULE        .text
 147 #define __INITDATA_OR_MODULE    .data
 148 #define __INITRODATA_OR_MODULE  .section ".rodata","a",%progbits
 149 #else
 150 #define __init_or_module __init
 151 #define __initdata_or_module __initdata
 152 #define __initconst_or_module __initconst
 153 #define __INIT_OR_MODULE __INIT
 154 #define __INITDATA_OR_MODULE __INITDATA
 155 #define __INITRODATA_OR_MODULE __INITRODATA
 156 #endif /*CONFIG_MODULES*/
 157 
 158 /* Generic info of form tag = "info" */
 159 #define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)
 160 
 161 /* For userspace: you can also call me... */
 162 #define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
 163 
 164 /* Soft module dependencies. See man modprobe.d for details.
 165  * Example: MODULE_SOFTDEP("pre: module-foo module-bar post: module-baz")
 166  */
 167 #define MODULE_SOFTDEP(_softdep) MODULE_INFO(softdep, _softdep)
 168 
 169 /*
 170  * The following license idents are currently accepted as indicating free
 171  * software modules
 172  *
 173  *      "GPL"                           [GNU Public License v2]
 174  *      "GPL v2"                        [GNU Public License v2]
 175  *      "GPL and additional rights"     [GNU Public License v2 rights and more]
 176  *      "Dual BSD/GPL"                  [GNU Public License v2
 177  *                                       or BSD license choice]
 178  *      "Dual MIT/GPL"                  [GNU Public License v2
 179  *                                       or MIT license choice]
 180  *      "Dual MPL/GPL"                  [GNU Public License v2
 181  *                                       or Mozilla license choice]
 182  *
 183  * The following other idents are available
 184  *
 185  *      "Proprietary"                   [Non free products]
 186  *
 187  * Both "GPL v2" and "GPL" (the latter also in dual licensed strings) are
 188  * merely stating that the module is licensed under the GPL v2, but are not
 189  * telling whether "GPL v2 only" or "GPL v2 or later". The reason why there
 190  * are two variants is a historic and failed attempt to convey more
 191  * information in the MODULE_LICENSE string. For module loading the
 192  * "only/or later" distinction is completely irrelevant and does neither
 193  * replace the proper license identifiers in the corresponding source file
 194  * nor amends them in any way. The sole purpose is to make the
 195  * 'Proprietary' flagging work and to refuse to bind symbols which are
 196  * exported with EXPORT_SYMBOL_GPL when a non free module is loaded.
 197  *
 198  * In the same way "BSD" is not a clear license information. It merely
 199  * states, that the module is licensed under one of the compatible BSD
 200  * license variants. The detailed and correct license information is again
 201  * to be found in the corresponding source files.
 202  *
 203  * There are dual licensed components, but when running with Linux it is the
 204  * GPL that is relevant so this is a non issue. Similarly LGPL linked with GPL
 205  * is a GPL combined work.
 206  *
 207  * This exists for several reasons
 208  * 1.   So modinfo can show license info for users wanting to vet their setup
 209  *      is free
 210  * 2.   So the community can ignore bug reports including proprietary modules
 211  * 3.   So vendors can do likewise based on their own policies
 212  */
 213 #define MODULE_LICENSE(_license) MODULE_INFO(license, _license)
 214 
 215 /*
 216  * Author(s), use "Name <email>" or just "Name", for multiple
 217  * authors use multiple MODULE_AUTHOR() statements/lines.
 218  */
 219 #define MODULE_AUTHOR(_author) MODULE_INFO(author, _author)
 220 
 221 /* What your module does. */
 222 #define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)
 223 
 224 #ifdef MODULE
 225 /* Creates an alias so file2alias.c can find device table. */
 226 #define MODULE_DEVICE_TABLE(type, name)                                 \
 227 extern typeof(name) __mod_##type##__##name##_device_table               \
 228   __attribute__ ((unused, alias(__stringify(name))))
 229 #else  /* !MODULE */
 230 #define MODULE_DEVICE_TABLE(type, name)
 231 #endif
 232 
 233 /* Version of form [<epoch>:]<version>[-<extra-version>].
 234  * Or for CVS/RCS ID version, everything but the number is stripped.
 235  * <epoch>: A (small) unsigned integer which allows you to start versions
 236  * anew. If not mentioned, it's zero.  eg. "2:1.0" is after
 237  * "1:2.0".
 238 
 239  * <version>: The <version> may contain only alphanumerics and the
 240  * character `.'.  Ordered by numeric sort for numeric parts,
 241  * ascii sort for ascii parts (as per RPM or DEB algorithm).
 242 
 243  * <extraversion>: Like <version>, but inserted for local
 244  * customizations, eg "rh3" or "rusty1".
 245 
 246  * Using this automatically adds a checksum of the .c files and the
 247  * local headers in "srcversion".
 248  */
 249 
 250 #if defined(MODULE) || !defined(CONFIG_SYSFS)
 251 #define MODULE_VERSION(_version) MODULE_INFO(version, _version)
 252 #else
 253 #define MODULE_VERSION(_version)                                        \
 254         MODULE_INFO(version, _version);                                 \
 255         static struct module_version_attribute ___modver_attr = {       \
 256                 .mattr  = {                                             \
 257                         .attr   = {                                     \
 258                                 .name   = "version",                    \
 259                                 .mode   = S_IRUGO,                      \
 260                         },                                              \
 261                         .show   = __modver_version_show,                \
 262                 },                                                      \
 263                 .module_name    = KBUILD_MODNAME,                       \
 264                 .version        = _version,                             \
 265         };                                                              \
 266         static const struct module_version_attribute                    \
 267         __used __attribute__ ((__section__ ("__modver")))               \
 268         * __moduleparam_const __modver_attr = &___modver_attr
 269 #endif
 270 
 271 /* Optional firmware file (or files) needed by the module
 272  * format is simply firmware file name.  Multiple firmware
 273  * files require multiple MODULE_FIRMWARE() specifiers */
 274 #define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware)
 275 
 276 #define MODULE_IMPORT_NS(ns) MODULE_INFO(import_ns, #ns)
 277 
 278 struct notifier_block;
 279 
 280 #ifdef CONFIG_MODULES
 281 
 282 extern int modules_disabled; /* for sysctl */
 283 /* Get/put a kernel symbol (calls must be symmetric) */
 284 void *__symbol_get(const char *symbol);
 285 void *__symbol_get_gpl(const char *symbol);
 286 #define symbol_get(x) ((typeof(&x))(__symbol_get(__stringify(x))))
 287 
 288 /* modules using other modules: kdb wants to see this. */
 289 struct module_use {
 290         struct list_head source_list;
 291         struct list_head target_list;
 292         struct module *source, *target;
 293 };
 294 
 295 enum module_state {
 296         MODULE_STATE_LIVE,      /* Normal state. */
 297         MODULE_STATE_COMING,    /* Full formed, running module_init. */
 298         MODULE_STATE_GOING,     /* Going away. */
 299         MODULE_STATE_UNFORMED,  /* Still setting it up. */
 300 };
 301 
 302 struct mod_tree_node {
 303         struct module *mod;
 304         struct latch_tree_node node;
 305 };
 306 
 307 struct module_layout {
 308         /* The actual code + data. */
 309         void *base;
 310         /* Total size. */
 311         unsigned int size;
 312         /* The size of the executable code.  */
 313         unsigned int text_size;
 314         /* Size of RO section of the module (text+rodata) */
 315         unsigned int ro_size;
 316         /* Size of RO after init section */
 317         unsigned int ro_after_init_size;
 318 
 319 #ifdef CONFIG_MODULES_TREE_LOOKUP
 320         struct mod_tree_node mtn;
 321 #endif
 322 };
 323 
 324 #ifdef CONFIG_MODULES_TREE_LOOKUP
 325 /* Only touch one cacheline for common rbtree-for-core-layout case. */
 326 #define __module_layout_align ____cacheline_aligned
 327 #else
 328 #define __module_layout_align
 329 #endif
 330 
 331 struct mod_kallsyms {
 332         Elf_Sym *symtab;
 333         unsigned int num_symtab;
 334         char *strtab;
 335         char *typetab;
 336 };
 337 
 338 #ifdef CONFIG_LIVEPATCH
 339 struct klp_modinfo {
 340         Elf_Ehdr hdr;
 341         Elf_Shdr *sechdrs;
 342         char *secstrings;
 343         unsigned int symndx;
 344 };
 345 #endif
 346 
 347 struct module {
 348         enum module_state state;
 349 
 350         /* Member of list of modules */
 351         struct list_head list;
 352 
 353         /* Unique handle for this module */
 354         char name[MODULE_NAME_LEN];
 355 
 356         /* Sysfs stuff. */
 357         struct module_kobject mkobj;
 358         struct module_attribute *modinfo_attrs;
 359         const char *version;
 360         const char *srcversion;
 361         struct kobject *holders_dir;
 362 
 363         /* Exported symbols */
 364         const struct kernel_symbol *syms;
 365         const s32 *crcs;
 366         unsigned int num_syms;
 367 
 368         /* Kernel parameters. */
 369 #ifdef CONFIG_SYSFS
 370         struct mutex param_lock;
 371 #endif
 372         struct kernel_param *kp;
 373         unsigned int num_kp;
 374 
 375         /* GPL-only exported symbols. */
 376         unsigned int num_gpl_syms;
 377         const struct kernel_symbol *gpl_syms;
 378         const s32 *gpl_crcs;
 379 
 380 #ifdef CONFIG_UNUSED_SYMBOLS
 381         /* unused exported symbols. */
 382         const struct kernel_symbol *unused_syms;
 383         const s32 *unused_crcs;
 384         unsigned int num_unused_syms;
 385 
 386         /* GPL-only, unused exported symbols. */
 387         unsigned int num_unused_gpl_syms;
 388         const struct kernel_symbol *unused_gpl_syms;
 389         const s32 *unused_gpl_crcs;
 390 #endif
 391 
 392 #ifdef CONFIG_MODULE_SIG
 393         /* Signature was verified. */
 394         bool sig_ok;
 395 #endif
 396 
 397         bool async_probe_requested;
 398 
 399         /* symbols that will be GPL-only in the near future. */
 400         const struct kernel_symbol *gpl_future_syms;
 401         const s32 *gpl_future_crcs;
 402         unsigned int num_gpl_future_syms;
 403 
 404         /* Exception table */
 405         unsigned int num_exentries;
 406         struct exception_table_entry *extable;
 407 
 408         /* Startup function. */
 409         int (*init)(void);
 410 
 411         /* Core layout: rbtree is accessed frequently, so keep together. */
 412         struct module_layout core_layout __module_layout_align;
 413         struct module_layout init_layout;
 414 
 415         /* Arch-specific module values */
 416         struct mod_arch_specific arch;
 417 
 418         unsigned long taints;   /* same bits as kernel:taint_flags */
 419 
 420 #ifdef CONFIG_GENERIC_BUG
 421         /* Support for BUG */
 422         unsigned num_bugs;
 423         struct list_head bug_list;
 424         struct bug_entry *bug_table;
 425 #endif
 426 
 427 #ifdef CONFIG_KALLSYMS
 428         /* Protected by RCU and/or module_mutex: use rcu_dereference() */
 429         struct mod_kallsyms *kallsyms;
 430         struct mod_kallsyms core_kallsyms;
 431 
 432         /* Section attributes */
 433         struct module_sect_attrs *sect_attrs;
 434 
 435         /* Notes attributes */
 436         struct module_notes_attrs *notes_attrs;
 437 #endif
 438 
 439         /* The command line arguments (may be mangled).  People like
 440            keeping pointers to this stuff */
 441         char *args;
 442 
 443 #ifdef CONFIG_SMP
 444         /* Per-cpu data. */
 445         void __percpu *percpu;
 446         unsigned int percpu_size;
 447 #endif
 448 
 449 #ifdef CONFIG_TRACEPOINTS
 450         unsigned int num_tracepoints;
 451         tracepoint_ptr_t *tracepoints_ptrs;
 452 #endif
 453 #ifdef CONFIG_TREE_SRCU
 454         unsigned int num_srcu_structs;
 455         struct srcu_struct **srcu_struct_ptrs;
 456 #endif
 457 #ifdef CONFIG_BPF_EVENTS
 458         unsigned int num_bpf_raw_events;
 459         struct bpf_raw_event_map *bpf_raw_events;
 460 #endif
 461 #ifdef CONFIG_JUMP_LABEL
 462         struct jump_entry *jump_entries;
 463         unsigned int num_jump_entries;
 464 #endif
 465 #ifdef CONFIG_TRACING
 466         unsigned int num_trace_bprintk_fmt;
 467         const char **trace_bprintk_fmt_start;
 468 #endif
 469 #ifdef CONFIG_EVENT_TRACING
 470         struct trace_event_call **trace_events;
 471         unsigned int num_trace_events;
 472         struct trace_eval_map **trace_evals;
 473         unsigned int num_trace_evals;
 474 #endif
 475 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 476         unsigned int num_ftrace_callsites;
 477         unsigned long *ftrace_callsites;
 478 #endif
 479 
 480 #ifdef CONFIG_LIVEPATCH
 481         bool klp; /* Is this a livepatch module? */
 482         bool klp_alive;
 483 
 484         /* Elf information */
 485         struct klp_modinfo *klp_info;
 486 #endif
 487 
 488 #ifdef CONFIG_MODULE_UNLOAD
 489         /* What modules depend on me? */
 490         struct list_head source_list;
 491         /* What modules do I depend on? */
 492         struct list_head target_list;
 493 
 494         /* Destruction function. */
 495         void (*exit)(void);
 496 
 497         atomic_t refcnt;
 498 #endif
 499 
 500 #ifdef CONFIG_CONSTRUCTORS
 501         /* Constructor functions. */
 502         ctor_fn_t *ctors;
 503         unsigned int num_ctors;
 504 #endif
 505 
 506 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
 507         struct error_injection_entry *ei_funcs;
 508         unsigned int num_ei_funcs;
 509 #endif
 510 } ____cacheline_aligned __randomize_layout;
 511 #ifndef MODULE_ARCH_INIT
 512 #define MODULE_ARCH_INIT {}
 513 #endif
 514 
 515 #ifndef HAVE_ARCH_KALLSYMS_SYMBOL_VALUE
 516 static inline unsigned long kallsyms_symbol_value(const Elf_Sym *sym)
 517 {
 518         return sym->st_value;
 519 }
 520 #endif
 521 
 522 extern struct mutex module_mutex;
 523 
 524 /* FIXME: It'd be nice to isolate modules during init, too, so they
 525    aren't used before they (may) fail.  But presently too much code
 526    (IDE & SCSI) require entry into the module during init.*/
 527 static inline bool module_is_live(struct module *mod)
 528 {
 529         return mod->state != MODULE_STATE_GOING;
 530 }
 531 
 532 struct module *__module_text_address(unsigned long addr);
 533 struct module *__module_address(unsigned long addr);
 534 bool is_module_address(unsigned long addr);
 535 bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr);
 536 bool is_module_percpu_address(unsigned long addr);
 537 bool is_module_text_address(unsigned long addr);
 538 
 539 static inline bool within_module_core(unsigned long addr,
 540                                       const struct module *mod)
 541 {
 542         return (unsigned long)mod->core_layout.base <= addr &&
 543                addr < (unsigned long)mod->core_layout.base + mod->core_layout.size;
 544 }
 545 
 546 static inline bool within_module_init(unsigned long addr,
 547                                       const struct module *mod)
 548 {
 549         return (unsigned long)mod->init_layout.base <= addr &&
 550                addr < (unsigned long)mod->init_layout.base + mod->init_layout.size;
 551 }
 552 
 553 static inline bool within_module(unsigned long addr, const struct module *mod)
 554 {
 555         return within_module_init(addr, mod) || within_module_core(addr, mod);
 556 }
 557 
 558 /* Search for module by name: must hold module_mutex. */
 559 struct module *find_module(const char *name);
 560 
 561 struct symsearch {
 562         const struct kernel_symbol *start, *stop;
 563         const s32 *crcs;
 564         enum {
 565                 NOT_GPL_ONLY,
 566                 GPL_ONLY,
 567                 WILL_BE_GPL_ONLY,
 568         } licence;
 569         bool unused;
 570 };
 571 
 572 /*
 573  * Search for an exported symbol by name.
 574  *
 575  * Must be called with module_mutex held or preemption disabled.
 576  */
 577 const struct kernel_symbol *find_symbol(const char *name,
 578                                         struct module **owner,
 579                                         const s32 **crc,
 580                                         bool gplok,
 581                                         bool warn);
 582 
 583 /*
 584  * Walk the exported symbol table
 585  *
 586  * Must be called with module_mutex held or preemption disabled.
 587  */
 588 bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
 589                                     struct module *owner,
 590                                     void *data), void *data);
 591 
 592 /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
 593    symnum out of range. */
 594 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
 595                         char *name, char *module_name, int *exported);
 596 
 597 /* Look for this name: can be of form module:name. */
 598 unsigned long module_kallsyms_lookup_name(const char *name);
 599 
 600 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 601                                              struct module *, unsigned long),
 602                                    void *data);
 603 
 604 extern void __noreturn __module_put_and_exit(struct module *mod,
 605                         long code);
 606 #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code)
 607 
 608 #ifdef CONFIG_MODULE_UNLOAD
 609 int module_refcount(struct module *mod);
 610 void __symbol_put(const char *symbol);
 611 #define symbol_put(x) __symbol_put(__stringify(x))
 612 void symbol_put_addr(void *addr);
 613 
 614 /* Sometimes we know we already have a refcount, and it's easier not
 615    to handle the error case (which only happens with rmmod --wait). */
 616 extern void __module_get(struct module *module);
 617 
 618 /* This is the Right Way to get a module: if it fails, it's being removed,
 619  * so pretend it's not there. */
 620 extern bool try_module_get(struct module *module);
 621 
 622 extern void module_put(struct module *module);
 623 
 624 #else /*!CONFIG_MODULE_UNLOAD*/
 625 static inline bool try_module_get(struct module *module)
 626 {
 627         return !module || module_is_live(module);
 628 }
 629 static inline void module_put(struct module *module)
 630 {
 631 }
 632 static inline void __module_get(struct module *module)
 633 {
 634 }
 635 #define symbol_put(x) do { } while (0)
 636 #define symbol_put_addr(p) do { } while (0)
 637 
 638 #endif /* CONFIG_MODULE_UNLOAD */
 639 int ref_module(struct module *a, struct module *b);
 640 
 641 /* This is a #define so the string doesn't get put in every .o file */
 642 #define module_name(mod)                        \
 643 ({                                              \
 644         struct module *__mod = (mod);           \
 645         __mod ? __mod->name : "kernel";         \
 646 })
 647 
 648 /* Dereference module function descriptor */
 649 void *dereference_module_function_descriptor(struct module *mod, void *ptr);
 650 
 651 /* For kallsyms to ask for address resolution.  namebuf should be at
 652  * least KSYM_NAME_LEN long: a pointer to namebuf is returned if
 653  * found, otherwise NULL. */
 654 const char *module_address_lookup(unsigned long addr,
 655                             unsigned long *symbolsize,
 656                             unsigned long *offset,
 657                             char **modname,
 658                             char *namebuf);
 659 int lookup_module_symbol_name(unsigned long addr, char *symname);
 660 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
 661 
 662 int register_module_notifier(struct notifier_block *nb);
 663 int unregister_module_notifier(struct notifier_block *nb);
 664 
 665 extern void print_modules(void);
 666 
 667 static inline bool module_requested_async_probing(struct module *module)
 668 {
 669         return module && module->async_probe_requested;
 670 }
 671 
 672 #ifdef CONFIG_LIVEPATCH
 673 static inline bool is_livepatch_module(struct module *mod)
 674 {
 675         return mod->klp;
 676 }
 677 #else /* !CONFIG_LIVEPATCH */
 678 static inline bool is_livepatch_module(struct module *mod)
 679 {
 680         return false;
 681 }
 682 #endif /* CONFIG_LIVEPATCH */
 683 
 684 bool is_module_sig_enforced(void);
 685 void set_module_sig_enforced(void);
 686 
 687 #else /* !CONFIG_MODULES... */
 688 
 689 static inline struct module *__module_address(unsigned long addr)
 690 {
 691         return NULL;
 692 }
 693 
 694 static inline struct module *__module_text_address(unsigned long addr)
 695 {
 696         return NULL;
 697 }
 698 
 699 static inline bool is_module_address(unsigned long addr)
 700 {
 701         return false;
 702 }
 703 
 704 static inline bool is_module_percpu_address(unsigned long addr)
 705 {
 706         return false;
 707 }
 708 
 709 static inline bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
 710 {
 711         return false;
 712 }
 713 
 714 static inline bool is_module_text_address(unsigned long addr)
 715 {
 716         return false;
 717 }
 718 
 719 static inline bool within_module_core(unsigned long addr,
 720                                       const struct module *mod)
 721 {
 722         return false;
 723 }
 724 
 725 static inline bool within_module_init(unsigned long addr,
 726                                       const struct module *mod)
 727 {
 728         return false;
 729 }
 730 
 731 static inline bool within_module(unsigned long addr, const struct module *mod)
 732 {
 733         return false;
 734 }
 735 
 736 /* Get/put a kernel symbol (calls should be symmetric) */
 737 #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
 738 #define symbol_put(x) do { } while (0)
 739 #define symbol_put_addr(x) do { } while (0)
 740 
 741 static inline void __module_get(struct module *module)
 742 {
 743 }
 744 
 745 static inline bool try_module_get(struct module *module)
 746 {
 747         return true;
 748 }
 749 
 750 static inline void module_put(struct module *module)
 751 {
 752 }
 753 
 754 #define module_name(mod) "kernel"
 755 
 756 /* For kallsyms to ask for address resolution.  NULL means not found. */
 757 static inline const char *module_address_lookup(unsigned long addr,
 758                                           unsigned long *symbolsize,
 759                                           unsigned long *offset,
 760                                           char **modname,
 761                                           char *namebuf)
 762 {
 763         return NULL;
 764 }
 765 
 766 static inline int lookup_module_symbol_name(unsigned long addr, char *symname)
 767 {
 768         return -ERANGE;
 769 }
 770 
 771 static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
 772 {
 773         return -ERANGE;
 774 }
 775 
 776 static inline int module_get_kallsym(unsigned int symnum, unsigned long *value,
 777                                         char *type, char *name,
 778                                         char *module_name, int *exported)
 779 {
 780         return -ERANGE;
 781 }
 782 
 783 static inline unsigned long module_kallsyms_lookup_name(const char *name)
 784 {
 785         return 0;
 786 }
 787 
 788 static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 789                                                            struct module *,
 790                                                            unsigned long),
 791                                                  void *data)
 792 {
 793         return 0;
 794 }
 795 
 796 static inline int register_module_notifier(struct notifier_block *nb)
 797 {
 798         /* no events will happen anyway, so this can always succeed */
 799         return 0;
 800 }
 801 
 802 static inline int unregister_module_notifier(struct notifier_block *nb)
 803 {
 804         return 0;
 805 }
 806 
 807 #define module_put_and_exit(code) do_exit(code)
 808 
 809 static inline void print_modules(void)
 810 {
 811 }
 812 
 813 static inline bool module_requested_async_probing(struct module *module)
 814 {
 815         return false;
 816 }
 817 
 818 static inline bool is_module_sig_enforced(void)
 819 {
 820         return false;
 821 }
 822 
 823 static inline void set_module_sig_enforced(void)
 824 {
 825 }
 826 
 827 /* Dereference module function descriptor */
 828 static inline
 829 void *dereference_module_function_descriptor(struct module *mod, void *ptr)
 830 {
 831         return ptr;
 832 }
 833 
 834 #endif /* CONFIG_MODULES */
 835 
 836 #ifdef CONFIG_SYSFS
 837 extern struct kset *module_kset;
 838 extern struct kobj_type module_ktype;
 839 extern int module_sysfs_initialized;
 840 #endif /* CONFIG_SYSFS */
 841 
 842 #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
 843 
 844 /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
 845 
 846 #define __MODULE_STRING(x) __stringify(x)
 847 
 848 #ifdef CONFIG_STRICT_MODULE_RWX
 849 extern void set_all_modules_text_rw(void);
 850 extern void set_all_modules_text_ro(void);
 851 extern void module_enable_ro(const struct module *mod, bool after_init);
 852 extern void module_disable_ro(const struct module *mod);
 853 #else
 854 static inline void set_all_modules_text_rw(void) { }
 855 static inline void set_all_modules_text_ro(void) { }
 856 static inline void module_enable_ro(const struct module *mod, bool after_init) { }
 857 static inline void module_disable_ro(const struct module *mod) { }
 858 #endif
 859 
 860 #ifdef CONFIG_GENERIC_BUG
 861 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
 862                          struct module *);
 863 void module_bug_cleanup(struct module *);
 864 
 865 #else   /* !CONFIG_GENERIC_BUG */
 866 
 867 static inline void module_bug_finalize(const Elf_Ehdr *hdr,
 868                                         const Elf_Shdr *sechdrs,
 869                                         struct module *mod)
 870 {
 871 }
 872 static inline void module_bug_cleanup(struct module *mod) {}
 873 #endif  /* CONFIG_GENERIC_BUG */
 874 
 875 #ifdef CONFIG_RETPOLINE
 876 extern bool retpoline_module_ok(bool has_retpoline);
 877 #else
 878 static inline bool retpoline_module_ok(bool has_retpoline)
 879 {
 880         return true;
 881 }
 882 #endif
 883 
 884 #ifdef CONFIG_MODULE_SIG
 885 static inline bool module_sig_ok(struct module *module)
 886 {
 887         return module->sig_ok;
 888 }
 889 #else   /* !CONFIG_MODULE_SIG */
 890 static inline bool module_sig_ok(struct module *module)
 891 {
 892         return true;
 893 }
 894 #endif  /* CONFIG_MODULE_SIG */
 895 
 896 #endif /* _LINUX_MODULE_H */