[PATCH] drivers/perf: arm-pmu: Fix handling of SPI lacking "interrupt-affinity" property

Hi Kevin,

Thanks for reporting this.

On Fri, Aug 26, 2016 at 12:11:55PM -0500, Kevin Hilman wrote:

On Tue, Jul 19, 2016 at 9:39 AM, Marc Zyngier [off-list ref] wrote:

quoted

Patch 19a469a58720 ("drivers/perf: arm-pmu: Handle per-interrupt
affinity mask") added support for partitionned PPI setups, but
inadvertently broke setups using SPIs without the "interrupt-affinity"
property (which is the case for UP platforms).

This patch restore the broken functionnality by testing whether the
interrupt is percpu or not instead of relying on the using_spi flag
that really means "SPI *and* interrupt-affinity property".

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Fixes: 19a469a58720 ("drivers/perf: arm-pmu: Handle per-interrupt affinity mask")
Signed-off-by: Marc Zyngier <redacted>

kernelci.org detected boot failures on bcm2835-rpi-b in mainline[1]
and was bisected down to this patch.  I verified that reverting this
patch on top of mainline gets bcm2835-rpi-b booting again.

I haven't been closely tracking this change, but a quick glance and it
looks like this platform is possibly missing IRQ properties from its
PMU node?  The DT for this platform simply has:

        arm-pmu {
            compatible = "arm,arm1176-pmu";
        };

Stefan Wahren posted a fix for this, so I've queued it locally and plan
to send via Catalin:

  http://lists.infradead.org/pipermail/linux-arm-kernel/2016-August/452475.html

Will