From: Anatol Pomozov <anatol.pomozov@gmail.com>
Date: Sun, 22 Sep 2013 18:43:47 +0000 (-0600)
Subject: cfq: explicitly use 64bit divide operation for 64bit arguments
X-Git-Tag: v3.12-rc2~4^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f3cff25f05f2ac29b2ee355e611b0657482f6f1d;p=pandora-kernel.git

cfq: explicitly use 64bit divide operation for 64bit arguments

'samples' is 64bit operant, but do_div() second parameter is 32.
do_div silently truncates high 32 bits and calculated result
is invalid.

In case if low 32bit of 'samples' are zeros then do_div() produces
kernel crash.

Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

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