linux-kernel - Re: [PATCH 0/2] genirq/affinity: try to make sure online CPU is assgined to irq vector

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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?