linux-kernel - Re: [PATCH 1/1] drivers/perf: arm_pmu_acpi: avoid perf IRQ init when guest PMU is off

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Date:   Thu, 25 May 2017 16:50:42 +0100
From:   Will Deacon <will.deacon@....com>
To:     Wei Huang <wei@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        mark.rutland@....com
Subject: Re: [PATCH 1/1] drivers/perf: arm_pmu_acpi: avoid perf IRQ init when
 guest PMU is off

On Thu, May 25, 2017 at 10:49:49AM -0500, Wei Huang wrote:
> On 05/25/2017 10:28 AM, Will Deacon wrote:
> > On Wed, May 24, 2017 at 09:36:41AM -0500, Wei Huang wrote:
> >>  	if (gicc->flags & ACPI_MADT_PERFORMANCE_IRQ_MODE)
> >>  		trigger = ACPI_EDGE_SENSITIVE;
> >>  	else
> >> @@ -58,7 +61,8 @@ static void arm_pmu_acpi_unregister_irq(int cpu)
> >>  		return;
> >>  
> >>  	gsi = gicc->performance_interrupt;
> >> -	acpi_unregister_gsi(gsi);
> >> +	if (gsi)
> >> +		acpi_unregister_gsi(gsi);
> > 
> > ... but then I don't see how we can get here, so I'll drop this hunk.
> 
> I am OK to drop it. It was added just to be cautious... Do you need
> another version from me or you will remove this hunk?

I can drop this hunk, no need to repost.

Thanks,

Will