__smp_store_mb     41 arch/sh/include/asm/barrier.h #define __smp_store_mb(var, value) do { (void)xchg(&var, value); } while (0)
__smp_store_mb     64 arch/x86/include/asm/barrier.h #define __smp_store_mb(var, value) do { (void)xchg(&var, value); } while (0)
__smp_store_mb    108 include/asm-generic/barrier.h #define __smp_store_mb(var, value)  do { WRITE_ONCE(var, value); __smp_mb(); } while (0)