M7350/external/compat-wireless/include/linux/atomic.h
2024-09-09 08:52:07 +00:00

47 lines
1.1 KiB
C

#ifndef _COMPAT_LINUX_ATOMIC_H
#define _COMPAT_LINUX_ATOMIC_H 1
#include <linux/version.h>
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,36))
#include_next <linux/atomic.h>
#else
#include <asm/atomic.h>
/**
* atomic_inc_not_zero_hint - increment if not null
* @v: pointer of type atomic_t
* @hint: probable value of the atomic before the increment
*
* This version of atomic_inc_not_zero() gives a hint of probable
* value of the atomic. This helps processor to not read the memory
* before doing the atomic read/modify/write cycle, lowering
* number of bus transactions on some arches.
*
* Returns: 0 if increment was not done, 1 otherwise.
*/
#ifndef atomic_inc_not_zero_hint
static inline int atomic_inc_not_zero_hint(atomic_t *v, int hint)
{
int val, c = hint;
/* sanity test, should be removed by compiler if hint is a constant */
if (!hint)
return atomic_inc_not_zero(v);
do {
val = atomic_cmpxchg(v, c, c + 1);
if (val == c)
return 1;
c = val;
} while (c);
return 0;
}
#endif
#endif /* (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,36)) */
#endif /* _COMPAT_LINUX_ATOMIC_H */