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Diffstat (limited to 'arch/x86/entry/vdso/vclock_gettime.c')
-rw-r--r--arch/x86/entry/vdso/vclock_gettime.c16
1 files changed, 2 insertions, 14 deletions
diff --git a/arch/x86/entry/vdso/vclock_gettime.c b/arch/x86/entry/vdso/vclock_gettime.c
index 9793322751e0..ca94fa649251 100644
--- a/arch/x86/entry/vdso/vclock_gettime.c
+++ b/arch/x86/entry/vdso/vclock_gettime.c
@@ -175,20 +175,8 @@ static notrace cycle_t vread_pvclock(int *mode)
notrace static cycle_t vread_tsc(void)
{
- cycle_t ret;
- u64 last;
-
- /*
- * Empirically, a fence (of type that depends on the CPU)
- * before rdtsc is enough to ensure that rdtsc is ordered
- * with respect to loads. The various CPU manuals are unclear
- * as to whether rdtsc can be reordered with later loads,
- * but no one has ever seen it happen.
- */
- rdtsc_barrier();
- ret = (cycle_t)__native_read_tsc();
-
- last = gtod->cycle_last;
+ cycle_t ret = (cycle_t)rdtsc_ordered();
+ u64 last = gtod->cycle_last;
if (likely(ret >= last))
return ret;