Re: [PATCH 3/3] blk-mq: Use llist_head for blk_cpu_done

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To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: Re: [PATCH 3/3] blk-mq: Use llist_head for blk_cpu_done
From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Date: Thu, 29 Oct 2020 15:56:23 +0100
Cc: linux-block@xxxxxxxxxxxxxxx, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, David Runge <dave@xxxxxxxxxxx>, linux-rt-users@xxxxxxxxxxxxxxx, Jens Axboe <axboe@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Daniel Wagner <dwagner@xxxxxxx>, Mike Galbraith <efault@xxxxxx>
In-reply-to: <20201029140536.GA6376@infradead.org>
References: <20201028065616.GA24449@infradead.org> <20201028141251.3608598-1-bigeasy@linutronix.de> <20201028141251.3608598-3-bigeasy@linutronix.de> <20201029131212.dsulzvsb6pahahbs@linutronix.de> <20201029140536.GA6376@infradead.org>

On 2020-10-29 14:05:36 [+0000], Christoph Hellwig wrote:
> Well, usb-storage obviously seems to do it, and the block layer
> does not prohibit it.

Also loop, nvme-tcp and then I stopped looking.
Any objections about adding local_bh_disable() around it?

Sebastian

Follow-Ups:
- Re: [PATCH 3/3] blk-mq: Use llist_head for blk_cpu_done
  - From: Christoph Hellwig

References:
- Re: [PATCH RFC] blk-mq: Don't IPI requests on PREEMPT_RT
  - From: Christoph Hellwig
- [PATCH 1/3] blk-mq: Don't complete on a remote CPU in force threaded mode
  - From: Sebastian Andrzej Siewior
- [PATCH 3/3] blk-mq: Use llist_head for blk_cpu_done
  - From: Sebastian Andrzej Siewior
- Re: [PATCH 3/3] blk-mq: Use llist_head for blk_cpu_done
  - From: Sebastian Andrzej Siewior
- Re: [PATCH 3/3] blk-mq: Use llist_head for blk_cpu_done
  - From: Christoph Hellwig

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