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clocksource: Fix bug with max_deferment margin calculation

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In order to leave a margin of 12.5% we should >> 3 not >> 5.

CC: stable@kernel.org
Signed-off-by: Yang Honggang (Joseph) <eagle.rtlinux@gmail.com>
[jstultz: Modified commit subject]
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
Yang Honggang (Joseph) 2011-12-01 22:22:41 -05:00 committed by John Stultz
parent 6a8943d9ec
commit b1f919664d
1 changed files with 2 additions and 2 deletions
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4
kernel/time/clocksource.c
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@ -548,7 +548,7 @@ static u64 clocksource_max_deferment(struct clocksource *cs)
* note a margin of 12.5% is used because this can be computed with
* a shift, versus say 10% which would require division.
*/
return max_nsecs - (max_nsecs >> 5);
return max_nsecs - (max_nsecs >> 3);
}
#ifndef CONFIG_ARCH_USES_GETTIMEOFFSET
@ -669,7 +669,7 @@ void __clocksource_updatefreq_scale(struct clocksource *cs, u32 scale, u32 freq)
* ~ 0.06ppm granularity for NTP. We apply the same 12.5%
* margin as we do in clocksource_max_deferment()
*/
sec = (cs->mask - (cs->mask >> 5));
sec = (cs->mask - (cs->mask >> 3));
do_div(sec, freq);
do_div(sec, scale);
if (!sec)