From 2c575026fae6e63771bd2a4c1d407214a8096a89 Mon Sep 17 00:00:00 2001
From: Hong Zhiguo <zhiguohong@tencent.com>
Date: Wed, 20 Nov 2013 10:35:05 -0700
Subject: [PATCH] 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>
---
Reading git-format-patch failed