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

[Jens Axboe]

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

Yeah will do, thanks.

-- 
Jens Axboe

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