linux-kernel - Re: [PATCH v2 06/11] blk-mq: Pass driver tags to blk_mq_clear_rq

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Message-ID: <23448833-593c-139f-6051-9b8e7d3deade@huawei.com>
Date:   Wed, 18 Aug 2021 13:00:13 +0100
From:   John Garry <john.garry@...wei.com>
To:     Ming Lei <ming.lei@...hat.com>
CC:     <axboe@...nel.dk>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <linux-block@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
        <kashyap.desai@...adcom.com>, <hare@...e.de>
Subject: Re: [PATCH v2 06/11] blk-mq: Pass driver tags to
 blk_mq_clear_rq_mapping()

>>   
>> @@ -2346,8 +2345,11 @@ static void blk_mq_clear_rq_mapping(struct blk_mq_tag_set *set,
>>   void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
>>   		     unsigned int hctx_idx)
>>   {
>> +	struct blk_mq_tags *drv_tags;
>>   	struct page *page;
>>   
>> +		drv_tags = set->tags[hctx_idx];
> 

Hi Ming,

> Indent.

That's intentional, as we have from later patch:

void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags 
*tags, unsigned int hctx_idx)
{
	struct blk_mq_tags *drv_tags;
	struct page *page;

+	if (blk_mq_is_sbitmap_shared(set->flags))
+		drv_tags = set->shared_sbitmap_tags;
+	else
		drv_tags = set->tags[hctx_idx];

	...

	blk_mq_clear_rq_mapping(drv_tags, tags);

}

And it's just nice to not re-indent later.

> 
>> +
>>   	if (tags->static_rqs && set->ops->exit_request) {
>>   		int i;
>>   
>> @@ -2361,7 +2363,7 @@ void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
>>   		}
>>   	}
>>   
>> -	blk_mq_clear_rq_mapping(set, tags, hctx_idx);
>> +	blk_mq_clear_rq_mapping(drv_tags, tags);
> 
> Maybe you can pass set->tags[hctx_idx] directly since there is only one
> reference on it.
> 

Again, intentional for similar reason, as above.

Thanks,
John