Re: [PATCH] blkcg: have bh disable for 32bit UP system reading 64bit stats

On 11/20/2013 10:24 AM, Tejun Heo wrote:

On Wed, Nov 06, 2013 at 07:14:44PM +0800, Hong Zhiguo wrote:

quoted

From: Hong Zhiguo <redacted>

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 <redacted>

Acked-by: Tejun Heo <tj@kernel.org>

Jens, can you please pick this one up?  This probably needs to be
tagged for stable too.

Yeah will do, thanks.

-- 
Jens Axboe