[PATCH] i386: Don't use the TSC in sched_clock if unstable

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=f9690982b8c2f9a2c65acdc113e758ec356676a3
caused a regression by letting sched_clock use the TSC even when cpufreq
disabled it. This caused scheduling weirdnesses.
Signed-off-by: NGuillaume Chazarain <guichaz@yahoo.fr>
Signed-off-by: NAndi Kleen <ak@suse.de>

arch/i386/kernel/tsc.c

@@ -105,7 +105,7 @@ unsigned long long sched_clock(void)
 	/*
 	 * Fall back to jiffies if there's no TSC available:
 	 */
-	if (unlikely(tsc_disable))
+	if (tsc_unstable || unlikely(tsc_disable))
 		/* No locking but a rare wrong value is not a big deal: */
 		return (jiffies_64 - INITIAL_JIFFIES) * (1000000000 / HZ);