From: Hong Zhiguo <zhiguohong@tencent.com>
Date: Wed, 20 Nov 2013 17:35:05 +0000 (-0700)
Subject: Update of blkg_stat and blkg_rwstat may happen in bh context.
X-Git-Tag: v3.13-rc3~8^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2c575026fae6e63771bd2a4c1d407214a8096a89;p=pandora-kernel.git

Update of blkg_stat and blkg_rwstat may happen in bh context.
While u64_stats_fetch_retry is only preempt_disable on 32bit
UP system. This is not enough to avoid preemption by bh and
may read strange 64 bit value.

Signed-off-by: Hong Zhiguo <zhiguohong@tencent.com>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

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