linux-kernel - Re: [PATCH 1/2] genirq/affinity: assign vectors to all possible CPUs

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Date:   Fri, 12 Jan 2018 20:35:46 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Ming Lei <ming.lei@...hat.com>
cc:     Jens Axboe <axboe@...com>, linux-block@...r.kernel.org,
        Christoph Hellwig <hch@...radead.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Stefan Haberland <sth@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 1/2] genirq/affinity: assign vectors to all possible
 CPUs

On Fri, 12 Jan 2018, Ming Lei wrote:

> From: Christoph Hellwig <hch@....de>
> 
> Currently we assign managed interrupt vectors to all present CPUs.  This
> works fine for systems were we only online/offline CPUs.  But in case of
> systems that support physical CPU hotplug (or the virtualized version of
> it) this means the additional CPUs covered for in the ACPI tables or on
> the command line are not catered for.  To fix this we'd either need to
> introduce new hotplug CPU states just for this case, or we can start
> assining vectors to possible but not present CPUs.
> 
> Reported-by: Christian Borntraeger <borntraeger@...ibm.com>
> Tested-by: Christian Borntraeger <borntraeger@...ibm.com>
> Tested-by: Stefan Haberland <sth@...ux.vnet.ibm.com>
> Cc: linux-kernel@...r.kernel.org
> Cc: Thomas Gleixner <tglx@...utronix.de>

FWIW, Acked-by: Thomas Gleixner <tglx@...utronix.de>