From: Paul Turner <pjt@google.com>
Date: Sat, 22 Jan 2011 04:44:59 +0000 (-0800)
Subject: sched: Fix sign under-flows in wake_affine
X-Git-Tag: v2.6.38-rc3~26^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e37b6a7b27b400c3aa488db8c6629a05095bc79c;p=pandora-kernel.git

sched: Fix sign under-flows in wake_affine

While care is taken around the zero-point in effective_load to not exceed
the instantaneous rq->weight, it's still possible (e.g. using wake_idx != 0)
for (load + effective_load) to underflow.

In this case the comparing the unsigned values can result in incorrect balanced
decisions.

Signed-off-by: Paul Turner <pjt@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20110122044851.734245014@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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