swh:1:snp:49cd9498d6cccc5e78252c27dcb645bcf7bf0c91
Raw File
Tip revision: 64f1607ffbbc772685733ea63e6f7f4183df1b16 authored by Linus Torvalds on 13 August 2009, 22:43:34 UTC
Linux 2.6.31-rc6
Tip revision: 64f1607
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