linux-kernel - Re: [PATCH 1/2] arm64: Mark PMU interrupt IRQF_NO

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Message-ID: <20150423104624.GD1652@arm.com>
Date:	Thu, 23 Apr 2015 11:46:25 +0100
From:	Will Deacon <will.deacon@....com>
To:	Anders Roxell <anders.roxell@...aro.org>
Cc:	Catalin Marinas <Catalin.Marinas@....com>,
	"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
	"paulus@...ba.org" <paulus@...ba.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"acme@...nel.org" <acme@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"khilman@...aro.org" <khilman@...aro.org>,
	"steve.capper@...aro.org" <steve.capper@...aro.org>
Subject: Re: [PATCH 1/2] arm64: Mark PMU interrupt IRQF_NO_THREAD

On Tue, Apr 21, 2015 at 04:05:54PM +0100, Anders Roxell wrote:
> Mark the PMU interrupts as non-threadable, as is the case with
> arch/arm: d9c3365 ARM: 7813/1: Mark pmu interupt IRQF_NO_THREAD
> 
> Suggested-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
> ---
>  arch/arm64/kernel/perf_event.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

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

Catalin can queue this for 4.2.

Cheers,

Will

> diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
> index 195991d..7db5c84 100644
> --- a/arch/arm64/kernel/perf_event.c
> +++ b/arch/arm64/kernel/perf_event.c
> @@ -488,7 +488,7 @@ armpmu_reserve_hardware(struct arm_pmu *armpmu)
>  			}
>  
>  			err = request_irq(irq, armpmu->handle_irq,
> -					IRQF_NOBALANCING,
> +					IRQF_NOBALANCING | IRQF_NO_THREAD,
>  					"arm-pmu", armpmu);
>  			if (err) {
>  				pr_err("unable to request IRQ%d for ARM PMU counters\n",
> -- 
> 2.1.4
> 
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