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>
mariux64 · Jan 30, 2008 · ad8ca49 · ad8ca49
1 parent df43510
commit ad8ca49
Showing 1 changed file with 5 additions and 1 deletion.
diff --git 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);
 	}
 }