From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Thu, 9 Dec 2010 13:15:34 +0000 (+0100)
Subject: sched: Fix the irqtime code to deal with u64 wraps
X-Git-Tag: v2.6.37-rc7~15^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fe44d62122829959e960bc699318d58966922a69;p=pandora-kernel.git

sched: Fix the irqtime code to deal with u64 wraps

Some ARM systems have a short sched_clock() [ which needs to be fixed
too ], but this exposed a bug in the irq_time code as well, it doesn't
deal with wraps at all.

Fix the irq_time code to deal with u64 wraps by re-writing the code to
only use delta increments, which avoids the whole issue.

Reviewed-by: Venkatesh Pallipadi <venki@google.com>
Reported-by: Mikael Pettersson <mikpe@it.uu.se>
Tested-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1292242433.6803.199.camel@twins>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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