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Diffstat (limited to 'arch/x86/kernel/tsc_sync.c')
-rw-r--r--arch/x86/kernel/tsc_sync.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kernel/tsc_sync.c b/arch/x86/kernel/tsc_sync.c
index 9ffb01c31c4..1c0dfbca87c 100644
--- a/arch/x86/kernel/tsc_sync.c
+++ b/arch/x86/kernel/tsc_sync.c
@@ -46,7 +46,9 @@ static __cpuinit void check_tsc_warp(void)
46 cycles_t start, now, prev, end; 46 cycles_t start, now, prev, end;
47 int i; 47 int i;
48 48
49 rdtsc_barrier();
49 start = get_cycles(); 50 start = get_cycles();
51 rdtsc_barrier();
50 /* 52 /*
51 * The measurement runs for 20 msecs: 53 * The measurement runs for 20 msecs:
52 */ 54 */
@@ -61,7 +63,9 @@ static __cpuinit void check_tsc_warp(void)
61 */ 63 */
62 __raw_spin_lock(&sync_lock); 64 __raw_spin_lock(&sync_lock);
63 prev = last_tsc; 65 prev = last_tsc;
66 rdtsc_barrier();
64 now = get_cycles(); 67 now = get_cycles();
68 rdtsc_barrier();
65 last_tsc = now; 69 last_tsc = now;
66 __raw_spin_unlock(&sync_lock); 70 __raw_spin_unlock(&sync_lock);
67 71