linux-kernel - Re: [PATCH] genirq/cpuhotplug: Revert "Set force affinity flag on hotplug migration"

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Date:   Thu, 27 Jul 2017 11:24:58 +0100
From:   Will Deacon <will.deacon@....com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Russell King <linux@....linux.org.uk>,
        LAK <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] genirq/cpuhotplug: Revert "Set force affinity flag on
 hotplug migration"

Thanks Thomas, this should fix our nightly testing which is currently
failing the CPU hotplug tests.

On Thu, Jul 27, 2017 at 12:21:11PM +0200, Thomas Gleixner wrote:
> --- a/kernel/irq/cpuhotplug.c
> +++ b/kernel/irq/cpuhotplug.c
> @@ -95,8 +95,13 @@ static bool migrate_one_irq(struct irq_d
>  		affinity = cpu_online_mask;
>  		brokeaff = true;
>  	}
> -
> -	err = irq_do_set_affinity(d, affinity, true);
> +	/*
> +	 * Do not set the force argument of irq_do_set_affinity() as this
> +	 * disables the masking of offline CPUs from the supplied affinity
> +	 * mask and therefor might keep/reassign the irq to the outgoing

Typo: therefore

> +	 * CPU.
> +	 */
> +	err = irq_do_set_affinity(d, affinity, false);

With that fixed:

Acked-by: Will Deacon <will.deacon@....com>

Cheers,

Will