release/src-rt-6.x.4708/linux/linux-2.6.36/arch/alpha/include/asm/barrier.h

   1 #ifndef __BARRIER_H
   2 #define __BARRIER_H
   3
   4 #include <asm/compiler.h>
   5
   6 #define mb() \
   7 __asm__ __volatile__("mb": : :"memory")
   8
   9 #define rmb() \
  10 __asm__ __volatile__("mb": : :"memory")
  11
  12 #define wmb() \
  13 __asm__ __volatile__("wmb": : :"memory")
  14
  15 #define read_barrier_depends() \
  16 __asm__ __volatile__("mb": : :"memory")
  17
  18 #ifdef CONFIG_SMP
  19 #define __ASM_SMP_MB    "\tmb\n"
  20 #define smp_mb()        mb()
  21 #define smp_rmb()       rmb()
  22 #define smp_wmb()       wmb()
  23 #define smp_read_barrier_depends()      read_barrier_depends()
  24 #else
  25 #define __ASM_SMP_MB
  26 #define smp_mb()        barrier()
  27 #define smp_rmb()       barrier()
  28 #define smp_wmb()       barrier()
  29 #define smp_read_barrier_depends()      do { } while (0)
  30 #endif
  31
  32 #define set_mb(var, value) \
  33 do { var = value; mb(); } while (0)
  34
  35 #endif          /* __BARRIER_H */