tree 4ab6ccbdf75b96229f176fc54e01580954e7a633
parent 82023bb7f75b0052f40d3e74169d191c3e4e6286
author Hong Zhiguo <zhiguohong@tencent.com> 1384968905 -0700
committer Jens Axboe <axboe@kernel.dk> 1384986784 -0700

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>