Commit 8ae81c25 authored Jun 29, 2015 by Stephen Boyd Committed by Will Deacon Jul 31, 2015

arm: perf: Set affinity for PPI based PMUs



For PPI based PMUs, we bail out early in of_pmu_irq_cfg() without
setting the PMU's supported_cpus bitmap. This causes the
smp_call_function_any() in armv7_probe_num_events() to fail. Set
the bitmap to be all CPUs so that we properly probe PMUs that use
PPIs.

Fixes: cc88116d ("arm: perf: treat PMUs as CPU affine")
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

parent 8e0c34b0

arch/arm/kernel/perf_event.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -795,8 +795,10 @@ static int of_pmu_irq_cfg(struct arm_pmu *pmu)

		/* Don't bother with PPIs; they're already affine */
		irq = platform_get_irq(pdev, 0);
		if (irq >= 0 && irq_is_percpu(irq))
		if (irq >= 0 && irq_is_percpu(irq)) {
		cpumask_setall(&pmu->supported_cpus);
		return 0;
		}

		irqs = kcalloc(pdev->num_resources, sizeof(*irqs), GFP_KERNEL);
		if (!irqs)