x86: add warning to check_tsc_warp()

add warning to check_tsc_warp() - if get_cycles() does not progress.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/kernel/tsc_sync.c b/arch/x86/kernel/tsc_sync.c
index 7110078..0577825 100644 (file)
--- 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);
        }
 }