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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __TOOLS_LINUX_ATOMIC_H
3#define __TOOLS_LINUX_ATOMIC_H
4
5#include <asm/atomic.h>
6
7void atomic_long_set(atomic_long_t *v, long i);
8
9/* atomic_cmpxchg_relaxed */
10#ifndef atomic_cmpxchg_relaxed
11#define atomic_cmpxchg_relaxed atomic_cmpxchg
12#define atomic_cmpxchg_release atomic_cmpxchg
13#endif /* atomic_cmpxchg_relaxed */
14
15static inline bool atomic_try_cmpxchg(atomic_t *ptr, int *oldp, int new)
16{
17 int ret, old = *oldp;
18
19 ret = atomic_cmpxchg(ptr, old, new);
20 if (ret != old)
21 *oldp = ret;
22 return ret == old;
23}
24
25static inline bool atomic_inc_unless_negative(atomic_t *v)
26{
27 int c = atomic_read(v);
28
29 do {
30 if (unlikely(c < 0))
31 return false;
32 } while (!atomic_try_cmpxchg(v, &c, c + 1));
33
34 return true;
35}
36
37#endif /* __TOOLS_LINUX_ATOMIC_H */