linux-kernel - Re: [PATCH BUGFIX] block: add missing group association in bio

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Date:	Mon, 9 May 2016 16:39:04 +0200
From:	Paolo <paolo.valente@...aro.org>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	Jens Axboe <axboe@...nel.dk>, Tejun Heo <tj@...nel.org>,
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	ulf.hansson@...aro.org, linus.walleij@...aro.org,
	broonie@...nel.org, stable@...r.kernel.org
Subject: Re: [PATCH BUGFIX] block: add missing group association in bio_split

Il 09/05/2016 16:35, Jeff Moyer ha scritto:
> Jeff Moyer <jmoyer@...hat.com> writes:
>
>> Paolo Valente <paolo.valente@...aro.org> writes:
>>
>>> @@ -1811,6 +1811,11 @@ struct bio *bio_split(struct bio *bio, int sectors,
>>>
>>>   	bio_advance(bio, split->bi_iter.bi_size);
>>>
>>> +#ifdef CONFIG_BLK_CGROUP
>>> +	if (bio->bi_css)
>>> +		bio_associate_blkcg(split, bio->bi_css);
>>> +#endif
>>> +
>>>   	return split;
>>>   }
>>>   EXPORT_SYMBOL(bio_split);
>>
>> Get rid of the #ifdefery.  This should be just:
>>
>> bio_associate_blkcg(split, bio->bi_css);
>
> Gah, I see that the bi_css member is only present for CONFIG_BLK_CGROUP.
> I guess we'll have to live with the ifdef.
>

We have already tried to remove it, but it seems it would require other 
major changes.

Thanks,
Paolo

> -Jeff
>