1 files changed, 5 insertions, 1 deletions

diff --git a/arch/x86/kernel/tsc_sync.c b/arch/x86/kernel/tsc_sync.c
index 7110078f242..0577825cf89 100644
--- a/arch/x86/kernel/tsc_sync.c
+++ b/arch/x86/kernel/tsc_sync.c
@@ -87,7 +87,11 @@ static __cpuinit void check_tsc_warp(void)
                         nr_warps++;
                         __raw_spin_unlock(&sync_lock);
                 }
-
+        }
+        if (!(now-start)) {
+                printk("Warning: zero tsc calibration delta: %Ld [max: %Ld]\n",
+                        now-start, end-start);
+                WARN_ON(1);
         }
 }