1#if defined(__i386__) || defined(__x86_64__)
 2#define barrier() asm volatile("" ::: "memory")
 3#define virt_mb() __sync_synchronize()
 4#define virt_rmb() barrier()
 5#define virt_wmb() barrier()
 6/* Atomic store should be enough, but gcc generates worse code in that case. */
 7#define virt_store_mb(var, value)  do { \
 8	typeof(var) virt_store_mb_value = (value); \
 9	__atomic_exchange(&(var), &virt_store_mb_value, &virt_store_mb_value, \
10			  __ATOMIC_SEQ_CST); \
11	barrier(); \
12} while (0);
13/* Weak barriers should be used. If not - it's a bug */
14# define mb() abort()
15# define rmb() abort()
16# define wmb() abort()
17#else
18#error Please fill in barrier macros
19#endif
20

 1#if defined(__i386__) || defined(__x86_64__)
 2#define barrier() asm volatile("" ::: "memory")
 3#define virt_mb() __sync_synchronize()
 4#define virt_rmb() barrier()
 5#define virt_wmb() barrier()
 6/* Atomic store should be enough, but gcc generates worse code in that case. */
 7#define virt_store_mb(var, value)  do { \
 8	typeof(var) virt_store_mb_value = (value); \
 9	__atomic_exchange(&(var), &virt_store_mb_value, &virt_store_mb_value, \
10			  __ATOMIC_SEQ_CST); \
11	barrier(); \
12} while (0);
13/* Weak barriers should be used. If not - it's a bug */
14# define mb() abort()
15# define rmb() abort()
16# define wmb() abort()
17#else
18#error Please fill in barrier macros
19#endif
20