linux-kernel - [PATCH 4.2 027/258] ARM: 8401/1: perf: Set affinity for PPI based PMUs

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Message-Id: <20151018014731.543977526@linuxfoundation.org>
Date:	Sat, 17 Oct 2015 18:55:40 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Will Deacon <will.deacon@....com>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: [PATCH 4.2 027/258] ARM: 8401/1: perf: Set affinity for PPI based PMUs

4.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stephen Boyd <sboyd@...eaurora.org>

commit 8ded1e1a92daa96307e4b84b707fee5993bc6047 upstream.

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: cc88116da0d1 ("arm: perf: treat PMUs as CPU affine")
Cc: Mark Rutland <mark.rutland@....com>
Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/kernel/perf_event.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -795,8 +795,10 @@ static int of_pmu_irq_cfg(struct arm_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)


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