Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)

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To: Hannes Reinecke <hare@xxxxxxx>
Subject: Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
From: Christoph Hellwig <hch@xxxxxx>
Date: Thu, 23 Nov 2017 15:47:28 +0100
Cc: Christoph Hellwig <hch@xxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Christian Borntraeger <borntraeger@xxxxxxxxxx>, Bart Van Assche <Bart.VanAssche@xxxxxxx>, "linux-block@xxxxxxxxxxxxxxx" <linux-block@xxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>
In-reply-to: <07e95492-9237-5c0c-fae9-c5704c735d38@suse.de>
User-agent: Mutt/1.5.17 (2007-11-01)

[fullquote deleted]

> What will happen for the CPU hotplug case?
> Wouldn't we route I/O to a disabled CPU with this patch?

Why would we route I/O to a disabled CPU (we generally route
I/O to devices to start with).  How would including possible
but not present cpus change anything?

References:
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Christian Borntraeger
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Jens Axboe
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Christian Borntraeger
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Jens Axboe
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Christian Borntraeger
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Jens Axboe
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Christoph Hellwig
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Jens Axboe
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Christoph Hellwig
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Hannes Reinecke

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