From: Michal Nazarewicz <mina86@mina86.com>
Date: Sun, 10 Nov 2013 19:42:01 +0000 (+0100)
Subject: sched/fair: Avoid integer overflow
X-Git-Tag: v3.13-rc1~90^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=85b088e934b9943322bfe37077289ae60f1b3414;p=pandora-kernel.git

sched/fair: Avoid integer overflow

sa->runnable_avg_sum is of type u32 but after shifting it by NICE_0_SHIFT
bits it is promoted to u64.  This of course makes no sense, since the
result will never be more then 32-bit long.  Casting sa->runnable_avg_sum
to u64 before it is shifted, fixes this problem.

Reviewed-by: Ben Segall <bsegall@google.com>
Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1384112521-25177-1-git-send-email-mpn@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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