linux-kernel - Re: linux-next: Tree for Aug 1

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Message-ID: <CACVXFVNi_R3Xecwm7weqEv5Lqy+F-Nxmbq4-i3089Ge2qHFD_g@mail.gmail.com>
Date:   Fri, 3 Aug 2018 00:50:53 +0800
From:   Ming Lei <tom.leiming@...il.com>
To:     Bart Van Assche <Bart.VanAssche@....com>
Cc:     "linux@...ck-us.net" <linux@...ck-us.net>,
        "ming.lei@...hat.com" <ming.lei@...hat.com>,
        "linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "hch@....de" <hch@....de>, "axboe@...nel.dk" <axboe@...nel.dk>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "sfr@...b.auug.org.au" <sfr@...b.auug.org.au>,
        "linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
        "James.Bottomley@...senpartnership.com" 
        <James.Bottomley@...senpartnership.com>,
        "josef@...icpanda.com" <josef@...icpanda.com>,
        "tj@...nel.org" <tj@...nel.org>
Subject: Re: linux-next: Tree for Aug 1

On Fri, Aug 3, 2018 at 12:40 AM, Bart Van Assche <Bart.VanAssche@....com> wrote:
> On Fri, 2018-08-03 at 00:27 +0800, Ming Lei wrote:
>> This issue can be fixed by reverting d250bf4e776ff09d5 ("blk-mq: only iterate over
>> inflight requests in blk_mq_tagset_busy_iter").
>>
>> This patch looks wrong, because 'blk_mq_rq_state(rq) == MQ_RQ_IN_FLIGHT'
>> isn't completely same with 'blk_mq_request_started(req)'.
>
> Please test the following change instead of reverting the commit mentioned
> above:
>
> diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
> index 09b2ee6694fb..25a0583d8b4c 100644
> --- a/block/blk-mq-tag.c
> +++ b/block/blk-mq-tag.c
> @@ -271,7 +271,7 @@ static bool bt_tags_iter(struct sbitmap *bitmap, unsigned int bitnr, void *data)
>          * test and set the bit before assining ->rqs[].
>          */
>         rq = tags->rqs[bitnr];
> -       if (rq && blk_mq_rq_state(rq) == MQ_RQ_IN_FLIGHT)
> +       if (rq && blk_mq_rq_state(rq) != MQ_RQ_IDLE)
>                 iter_data->fn(rq, iter_data->data, reserved);
>
>         return true;
>

I just sent out a similar patch on list, but use blk_mq_request_started()
instead.

https://marc.info/?l=linux-scsi&m=153322823307754&w=2

Thanks,
Ming Lei