swh:1:snp:32555a3fd8878f019c2ebd6c964bc1edcaeff337
Raw File
Tip revision: 326ba5010a5429a5a528b268b36a5900d4ab0eba authored by Linus Torvalds on 28 August 2009, 00:59:04 UTC
Linux 2.6.31-rc8
Tip revision: 326ba50
cmpxchg.h
#ifndef __ASM_GENERIC_CMPXCHG_H
#define __ASM_GENERIC_CMPXCHG_H

/*
 * Generic cmpxchg
 *
 * Uses the local cmpxchg. Does not support SMP.
 */
#ifdef CONFIG_SMP
#error "Cannot use generic cmpxchg on SMP"
#endif

/*
 * Atomic compare and exchange.
 *
 * Do not define __HAVE_ARCH_CMPXCHG because we want to use it to check whether
 * a cmpxchg primitive faster than repeated local irq save/restore exists.
 */
#define cmpxchg(ptr, o, n)	cmpxchg_local((ptr), (o), (n))
#define cmpxchg64(ptr, o, n)	cmpxchg64_local((ptr), (o), (n))

#endif
back to top