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| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2017-03-14 17:07:33 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2017-03-14 17:07:33 +0300 |
| commit | b70366e5d31788650b2a5cec5cd13ea80ac7e44a (patch) | |
| tree | d972ffd190111d699200448494fda333d28b2486 /include/linux/refcount.h | |
| parent | f42e181935d5e5670c87d31ae48063a495bbacae (diff) | |
| parent | db6ccf23e8ba40fc2e8914ec9c0eb950df71d9fe (diff) | |
| download | linux-b70366e5d31788650b2a5cec5cd13ea80ac7e44a.tar.xz | |
Merge tag 'doc-4.11-images' of git://git.lwn.net/linux into drm-misc-next
Pointer for Markus's image conversion work.
We need this so we can merge all the pretty drm graphs for 4.12.
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
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 */ |