linux-kernel - Re: [PATCH v2 1/3] genirq/affinity: Add irq_update_affinity

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Message-ID: <87blgf8pkk.fsf@nanos.tec.linutronix.de>
Date:   Mon, 02 Nov 2020 21:35:23 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     John Garry <john.garry@...wei.com>, gregkh@...uxfoundation.org,
        rafael@...nel.org, martin.petersen@...cle.com, jejb@...ux.ibm.com
Cc:     linuxarm@...wei.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, maz@...nel.org
Subject: Re: [PATCH v2 1/3] genirq/affinity: Add irq_update_affinity_desc()

On Mon, Nov 02 2020 at 17:32, John Garry wrote:
> On 28/10/2020 18:22, Thomas Gleixner wrote:
>> But all of this can't work on x86 due to the way how vector allocation
>> works. Let me think about that.
>
> Is the problem that we reserve per-cpu managed interrupt space when 
> allocated irq vectors on x86, and so later changing managed vs 
> non-managed setting for irqs messes up this accounting somehow?

Correct. I have a halfways working solution for that, but I need to fix
some other thing first.

Thanks,

        tglx