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Message-ID: <20180115174036.GA20191@infradead.org>
Date: Mon, 15 Jan 2018 09:40:36 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Ming Lei <ming.lei@...hat.com>
Cc: Jens Axboe <axboe@...com>, linux-block@...r.kernel.org,
linux-kernel@...r.kernel.org,
Christoph Hellwig <hch@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
Laurence Oberman <loberman@...hat.com>,
Mike Snitzer <snitzer@...hat.com>
Subject: Re: [PATCH 0/2] genirq/affinity: try to make sure online CPU is
assgined to irq vector
On Tue, Jan 16, 2018 at 12:03:43AM +0800, Ming Lei wrote:
> Hi,
>
> These two patches fixes IO hang issue reported by Laurence.
>
> 84676c1f21 ("genirq/affinity: assign vectors to all possible CPUs")
> may cause one irq vector assigned to all offline CPUs, then this vector
> can't handle irq any more.
Well, that very much was the intention of managed interrupts. Why
does the device raise an interrupt for a queue that has no online
cpu assigned to it?
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