This source file includes following definitions.
- __lockref_is_dead
1
2 #ifndef __LINUX_LOCKREF_H
3 #define __LINUX_LOCKREF_H
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18 #include <linux/spinlock.h>
19 #include <generated/bounds.h>
20
21 #define USE_CMPXCHG_LOCKREF \
22 (IS_ENABLED(CONFIG_ARCH_USE_CMPXCHG_LOCKREF) && \
23 IS_ENABLED(CONFIG_SMP) && SPINLOCK_SIZE <= 4)
24
25 struct lockref {
26 union {
27 #if USE_CMPXCHG_LOCKREF
28 aligned_u64 lock_count;
29 #endif
30 struct {
31 spinlock_t lock;
32 int count;
33 };
34 };
35 };
36
37 extern void lockref_get(struct lockref *);
38 extern int lockref_put_return(struct lockref *);
39 extern int lockref_get_not_zero(struct lockref *);
40 extern int lockref_put_not_zero(struct lockref *);
41 extern int lockref_get_or_lock(struct lockref *);
42 extern int lockref_put_or_lock(struct lockref *);
43
44 extern void lockref_mark_dead(struct lockref *);
45 extern int lockref_get_not_dead(struct lockref *);
46
47
48 static inline bool __lockref_is_dead(const struct lockref *l)
49 {
50 return ((int)l->count < 0);
51 }
52
53 #endif