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authorRusty Russell <rusty@rustcorp.com.au>2007-08-09 20:52:35 +1000
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-08-09 08:14:56 -0700
commit37250097e1b730c30da1790e354c0da65e617043 (patch)
tree354c1193eb230ecc27eb1a00d555d8c2bc7fd6e9 /drivers
parent88ffc3505988196ef5cfdc0278ad89025c2a7b1a (diff)
Fix non-TSC guest clocksource lockup
lguest uses a host-supplied wallclock-based clocksource when the TSC is not reliable. As this is already in nanoseconds, I naively used a multiplier of 1 and a shift of 0. But update_wall_time() in its infinite wisdom decides to adjust the clock a little (where does it think it's getting a more accurate time from?) It will happily tweak the multiplier... to 0, then -1. So the "fix" is to use a shift of 22 like everyone else, and a multiplier of 1 << 22. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/lguest/lguest.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/lguest/lguest.c b/drivers/lguest/lguest.c
index 1bc1546c7fd..fb17d2757be 100644
--- a/drivers/lguest/lguest.c
+++ b/drivers/lguest/lguest.c
@@ -687,7 +687,8 @@ static struct clocksource lguest_clock = {
.rating = 400,
.read = lguest_clock_read,
.mask = CLOCKSOURCE_MASK(64),
- .mult = 1,
+ .mult = 1 << 22,
+ .shift = 22,
};
/* The "scheduler clock" is just our real clock, adjusted to start at zero */
@@ -770,7 +771,6 @@ static void lguest_time_init(void)
* way, the "rating" is initialized so high that it's always chosen
* over any other clocksource. */
if (lguest_data.tsc_khz) {
- lguest_clock.shift = 22;
lguest_clock.mult = clocksource_khz2mult(lguest_data.tsc_khz,
lguest_clock.shift);
lguest_clock.flags = CLOCK_SOURCE_IS_CONTINUOUS;