[linux-2.6-block.git] / include / asm-generic / 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
Commit	Line	Data
068fbad2 MD	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