1 files changed, 6 insertions, 0 deletions

diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
index 085f2e09b9dc..26524ce3b239 100644
--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -728,6 +728,12 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c)
 
         /* Fix cpuid4 emulation for more */
         num_cache_leaves = 3;
+
+        /* When there is only one core no need to synchronize RDTSC */
+        if (num_possible_cpus() == 1)
+                set_bit(X86_FEATURE_SYNC_RDTSC, &c->x86_capability);
+        else
+                clear_bit(X86_FEATURE_SYNC_RDTSC, &c->x86_capability);
 }
 
 static void __cpuinit detect_ht(struct cpuinfo_x86 *c)