diff options
Diffstat (limited to 'kernel/arch/x86/um/asm/barrier.h')
| -rw-r--r-- | kernel/arch/x86/um/asm/barrier.h | 16 |
1 files changed, 2 insertions, 14 deletions
diff --git a/kernel/arch/x86/um/asm/barrier.h b/kernel/arch/x86/um/asm/barrier.h index 7e8a1a650..755481f14 100644 --- a/kernel/arch/x86/um/asm/barrier.h +++ b/kernel/arch/x86/um/asm/barrier.h @@ -39,22 +39,10 @@ #define smp_mb() barrier() #define smp_rmb() barrier() #define smp_wmb() barrier() -#define set_mb(var, value) do { var = value; barrier(); } while (0) + +#define smp_store_mb(var, value) do { WRITE_ONCE(var, value); barrier(); } while (0) #define read_barrier_depends() do { } while (0) #define smp_read_barrier_depends() do { } while (0) -/* - * Stop RDTSC speculation. This is needed when you need to use RDTSC - * (or get_cycles or vread that possibly accesses the TSC) in a defined - * code region. - * - * (Could use an alternative three way for this if there was one.) - */ -static inline void rdtsc_barrier(void) -{ - alternative_2("", "mfence", X86_FEATURE_MFENCE_RDTSC, - "lfence", X86_FEATURE_LFENCE_RDTSC); -} - #endif |