Root/include/asm-generic/cmpxchg.h

1#ifndef __ASM_GENERIC_CMPXCHG_H
2#define __ASM_GENERIC_CMPXCHG_H
3
4/*
5 * Generic cmpxchg
6 *
7 * Uses the local cmpxchg. Does not support SMP.
8 */
9#ifdef CONFIG_SMP
10#error "Cannot use generic cmpxchg on SMP"
11#endif
12
13/*
14 * Atomic compare and exchange.
15 *
16 * Do not define __HAVE_ARCH_CMPXCHG because we want to use it to check whether
17 * a cmpxchg primitive faster than repeated local irq save/restore exists.
18 */
19#define cmpxchg(ptr, o, n) cmpxchg_local((ptr), (o), (n))
20#define cmpxchg64(ptr, o, n) cmpxchg64_local((ptr), (o), (n))
21
22#endif
23

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