linux-kernel - Re: [PATCH 01/13] blk-mq: avoid sleep in blk_mq_alloc_request

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Message-ID: <fd69227c-1350-c8fa-8231-5ca230cd2c43@huaweicloud.com>
Date:   Fri, 23 Dec 2022 14:38:50 +0800
From:   Kemeng Shi <shikemeng@...weicloud.com>
To:     Christoph Hellwig <hch@....de>
Cc:     axboe@...nel.dk, dwagner@...e.de, hare@...e.de,
        ming.lei@...hat.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, john.garry@...wei.com
Subject: Re: [PATCH 01/13] blk-mq: avoid sleep in blk_mq_alloc_request_hctx

Hi, Christoph.
on 12/23/2022 1:37 PM, Christoph Hellwig wrote:
> On Fri, Dec 23, 2022 at 08:52:11PM +0800, Kemeng Shi wrote:
>> +	if (WARN_ON_ONCE(((!flags) & (BLK_MQ_REQ_NOWAIT | BLK_MQ_REQ_RESERVED))))
> 
> This check does not make any sense.  I think what you want is
> 
> 	if (WARN_ON_ONCE(!(flags & BLK_MQ_REQ_NOWAIT) ||
> 	    WARN_ON_ONCE(!(flags & BLK_MQ_REQ_RESERVED))))
This is exactly what I want and I will fix this in next version. Thanks.

-- 
Best wishes
Kemeng Shi