From: "Yang Honggang (Joseph)" <eagle.rtlinux@gmail.com>
To: John Stultz <johnstul@us.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org, ganggexiongqi@126.com,
"Yang Honggang (Joseph)" <eagle.rtlinux@gmail.com>
Subject: [PATCH 1/1] clocksource: In order to leave a margin of 12.5% we should >> 3 not >> 5.
Date: Thu, 1 Dec 2011 22:22:41 -0500 [thread overview]
Message-ID: <1322796161-28188-1-git-send-email-eagle.rtlinux@gmail.com> (raw)
Signed-off-by: Yang Honggang (Joseph) <eagle.rtlinux@gmail.com>
---
kernel/time/clocksource.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index cf52fda..b9bf9d0 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -529,7 +529,7 @@ 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
@@ -651,7 +651,7 @@ 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)
--
1.7.2.5
reply other threads:[~2011-12-01 14:22 UTC|newest]
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