From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Ming Lei <ming.lei@redhat.com>
Cc: linux-block@vger.kernel.org, Jens Axboe <axboe@kernel.dk>,
Thomas Gleixner <tglx@linutronix.de>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [PATCH] blk-mq: Remove get_cpu() in __blk_mq_delay_run_hw_queue().
Date: Tue, 15 Feb 2022 10:31:49 +0100 [thread overview]
Message-ID: <YgtzBdwYxA7ryJh3@linutronix.de> (raw)
In-Reply-To: <YgtxIZdDXie01OJJ@T590>
On 2022-02-15 17:23:45 [+0800], Ming Lei wrote:
> > diff --git a/block/blk-mq.c b/block/blk-mq.c
> > index 1adfe4824ef5e..90217f1b09add 100644
> > --- a/block/blk-mq.c
> > +++ b/block/blk-mq.c
> > @@ -2040,14 +2040,10 @@ static void __blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async,
> > return;
> >
> > if (!async && !(hctx->flags & BLK_MQ_F_BLOCKING)) {
> > - int cpu = get_cpu();
>
> Did you observe the warning triggered? might_sleep_if(true) in
> __blk_mq_run_dispatch_ops() is only supposed to be run in case of
> (hctx->flags & BLK_MQ_F_BLOCKING).
I haven't seen it triggering but if that call chain is possible then it
will triggert due to get_cpu().
> Thanks,
> Ming
Sebastian
next prev parent reply other threads:[~2022-02-15 9:31 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-15 9:11 [PATCH] blk-mq: Remove get_cpu() in __blk_mq_delay_run_hw_queue() Sebastian Andrzej Siewior
2022-02-15 9:23 ` Ming Lei
2022-02-15 9:31 ` Sebastian Andrzej Siewior [this message]
2022-02-15 11:58 ` Ming Lei
2022-02-15 12:11 ` Sebastian Andrzej Siewior
2022-02-15 12:22 ` Ming Lei
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