[PATCH] disable lost tick compensation before TSCs are synced

Avoid lost tick compensation early in boot before the TSCs are
synchronized.  Currently timekeeping is enabled before the TSCs are
synchronized, thus when the TSCs are synched (reset to zero), it appears
that a number of lost ticks have occurred.  This can cause premature expiry
of timers and in extreme cases can cause the soft lockup detection to fire.

This resolves issues reported by Andy Whitcroft as well as bug #5366
reported by Tim Mann.

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Acked-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/i386/kernel/timers/timer_tsc.c b/arch/i386/kernel/timers/timer_tsc.c
index 47675bb..7c86e3c 100644 (file)
--- a/arch/i386/kernel/timers/timer_tsc.c
+++ b/arch/i386/kernel/timers/timer_tsc.c
@@ -45,6 +45,15 @@ static unsigned long last_tsc_high; /* msb 32 bits of Time Stamp Counter */
 static unsigned long long monotonic_base;
 static seqlock_t monotonic_lock = SEQLOCK_UNLOCKED;
 
+/* Avoid compensating for lost ticks before TSCs are synched */
+static int detect_lost_ticks;
+static int __init start_lost_tick_compensation(void)
+{
+       detect_lost_ticks = 1;
+       return 0;
+}
+late_initcall(start_lost_tick_compensation);
+
 /* convert from cycles(64bits) => nanoseconds (64bits)
  *  basic equation:
  *             ns = cycles / (freq / ns_per_sec)
@@ -196,7 +205,8 @@ static void mark_offset_tsc_hpet(void)
 
        /* lost tick compensation */
        offset = hpet_readl(HPET_T0_CMP) - hpet_tick;
-       if (unlikely(((offset - hpet_last) > hpet_tick) && (hpet_last != 0))) {
+       if (unlikely(((offset - hpet_last) > hpet_tick) && (hpet_last != 0))
+                                       && detect_lost_ticks) {
                int lost_ticks = (offset - hpet_last) / hpet_tick;
                jiffies_64 += lost_ticks;
        }
@@ -421,7 +431,7 @@ static void mark_offset_tsc(void)
        delta += delay_at_last_interrupt;
        lost = delta/(1000000/HZ);
        delay = delta%(1000000/HZ);
-       if (lost >= 2) {
+       if (lost >= 2 && detect_lost_ticks) {
                jiffies_64 += lost-1;
 
                /* sanity check to ensure we're not always losing ticks */