LXR linux/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