[PATCH] x86: Log reason why TSC was marked unstable

[safe/jmp/linux-2.6] / arch / i386 / kernel / tsc.c

diff --git a/arch/i386/kernel/tsc.c b/arch/i386/kernel/tsc.c
index 6cb8f53..755209d 100644 (file)
--- a/arch/i386/kernel/tsc.c
+++ b/arch/i386/kernel/tsc.c
@@ -233,7 +233,7 @@ time_cpufreq_notifier(struct notifier_block *nb, unsigned long val, void *data)
                                 * TSC based sched_clock turns
                                 * to junk w/ cpufreq
                                 */
-                               mark_tsc_unstable();
+                               mark_tsc_unstable("cpufreq changes");
                        }
                }
        }
@@ -281,11 +281,12 @@ static struct clocksource clocksource_tsc = {
                                  CLOCK_SOURCE_MUST_VERIFY,
 };
 
-void mark_tsc_unstable(void)
+void mark_tsc_unstable(char *reason)
 {
        if (!tsc_unstable) {
                tsc_unstable = 1;
                tsc_enabled = 0;
+               printk("Marking TSC unstable due to: %s.\n", reason);
                /* Can be called before registration */
                if (clocksource_tsc.mult)
                        clocksource_change_rating(&clocksource_tsc, 0);