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| author | Mark Brown <broonie@kernel.org> | 2017-04-25 16:35:35 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2017-04-25 16:35:35 +0100 |
| commit | 9095bf25ea08135a5b74875dd0e3eeaddc4218a0 (patch) | |
| tree | a4e6976eab0e7a5b6258281077cd5853c7e69514 /include/linux/refcount.h | |
| parent | cdf4275e957c6bad3756e98942341667f1d7de7d (diff) | |
| parent | c1ae3cfa0e89fa1a7ecc4c99031f5e9ae99d9201 (diff) | |
Merge tag 'v4.11-rc1' into regulator-arizona
Linux 4.11-rc1
Diffstat (limited to 'include/linux/refcount.h')
| -rw-r--r-- | include/linux/refcount.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/include/linux/refcount.h b/include/linux/refcount.h new file mode 100644 index 000000000000..0023fee4bbbc --- /dev/null +++ b/include/linux/refcount.h @@ -0,0 +1,42 @@ +#ifndef _LINUX_REFCOUNT_H +#define _LINUX_REFCOUNT_H + +#include <linux/atomic.h> +#include <linux/mutex.h> +#include <linux/spinlock.h> +#include <linux/kernel.h> + +typedef struct refcount_struct { + atomic_t refs; +} refcount_t; + +#define REFCOUNT_INIT(n) { .refs = ATOMIC_INIT(n), } + +static inline void refcount_set(refcount_t *r, unsigned int n) +{ + atomic_set(&r->refs, n); +} + +static inline unsigned int refcount_read(const refcount_t *r) +{ + return atomic_read(&r->refs); +} + +extern __must_check bool refcount_add_not_zero(unsigned int i, refcount_t *r); +extern void refcount_add(unsigned int i, refcount_t *r); + +extern __must_check bool refcount_inc_not_zero(refcount_t *r); +extern void refcount_inc(refcount_t *r); + +extern __must_check bool refcount_sub_and_test(unsigned int i, refcount_t *r); +extern void refcount_sub(unsigned int i, refcount_t *r); + +extern __must_check bool refcount_dec_and_test(refcount_t *r); +extern void refcount_dec(refcount_t *r); + +extern __must_check bool refcount_dec_if_one(refcount_t *r); +extern __must_check bool refcount_dec_not_one(refcount_t *r); +extern __must_check bool refcount_dec_and_mutex_lock(refcount_t *r, struct mutex *lock); +extern __must_check bool refcount_dec_and_lock(refcount_t *r, spinlock_t *lock); + +#endif /* _LINUX_REFCOUNT_H */ |