tools/virtio/asm/barrier.h

   1 #if defined(__i386__) || defined(__x86_64__)
   2 #define barrier() asm volatile("" ::: "memory")
   3 #define mb() __sync_synchronize()
   4
   5 #define smp_mb()        mb()
   6 # define smp_rmb()      barrier()
   7 # define smp_wmb()      barrier()
   8 /* Weak barriers should be used. If not - it's a bug */
   9 # define rmb()  abort()
  10 # define wmb()  abort()
  11 #else
  12 #error Please fill in barrier macros
  13 #endif
  14