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

[Tejun Heo]

On Wed, Nov 06, 2013 at 07:14:44PM +0800, Hong Zhiguo wrote:
> From: Hong Zhiguo <zhiguohong@xxxxxxxxxxx>
> 
> 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@xxxxxxxxxxx>

Acked-by: Tejun Heo <tj@xxxxxxxxxx>

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

Thanks!

-- 
tejun
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