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include/linux/lockref.h

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 */

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#include <linux/spinlock.h>

 

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#include <generated/bounds.h>

 

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#define USE_CMPXCHG_LOCKREF \

 

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        (IS_ENABLED(CONFIG_ARCH_USE_CMPXCHG_LOCKREF) && \

 

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         IS_ENABLED(CONFIG_SMP) && SPINLOCK_SIZE <= 4)

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struct lockref {

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        union {

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#ifdef CONFIG_CMPXCHG_LOCKREF

 

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#if USE_CMPXCHG_LOCKREF

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                aligned_u64 lock_count;

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#endif

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                struct {

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extern void lockref_mark_dead(struct lockref *);

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extern int lockref_get_not_dead(struct lockref *);

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/* Must be called under spinlock for reliable results */

 

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static inline int __lockref_is_dead(const struct lockref *l)

 

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{

 

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        return ((int)l->count < 0);

 

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}

 

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#endif /* __LINUX_LOCKREF_H */

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