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
7 void 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
atomic_try_cmpxchg(atomic_t * ptr,int * oldp,int new)15 static 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
atomic_inc_unless_negative(atomic_t * v)25 static 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 */
38