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