arch/microblaze/include/asm/atomic.h at v3.3-rc2

tjh.dev / kernel

Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

kernel os linux

kernel / arch / microblaze / include / asm / atomic.h

at v3.3-rc2 25 lines 508 B view raw

wrap content

 1#ifndef _ASM_MICROBLAZE_ATOMIC_H
 2#define _ASM_MICROBLAZE_ATOMIC_H
 3
 4#include <asm-generic/atomic.h>
 5#include <asm-generic/atomic64.h>
 6
 7/*
 8 * Atomically test *v and decrement if it is greater than 0.
 9 * The function returns the old value of *v minus 1.
10 */
11static inline int atomic_dec_if_positive(atomic_t *v)
12{
13	unsigned long flags;
14	int res;
15
16	local_irq_save(flags);
17	res = v->counter - 1;
18	if (res >= 0)
19		v->counter = res;
20	local_irq_restore(flags);
21
22	return res;
23}
24
25#endif /* _ASM_MICROBLAZE_ATOMIC_H */