Patch "ARM: 8401/1: perf: Set affinity for PPI based PMUs" has been added to the 4.2-stable tree

Patch "ARM: 8401/1: perf: Set affinity for PPI based PMUs" has been added to the 4.2-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ARM: 8401/1: perf: Set affinity for PPI based PMUs

to the 4.2-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm-8401-1-perf-set-affinity-for-ppi-based-pmus.patch
and it can be found in the queue-4.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 8ded1e1a92daa96307e4b84b707fee5993bc6047 Mon Sep 17 00:00:00 2001
From: Stephen Boyd <sboyd@codeaurora.org>
Date: Tue, 7 Jul 2015 18:16:15 +0100
Subject: ARM: 8401/1: perf: Set affinity for PPI based PMUs

From: Stephen Boyd <sboyd@codeaurora.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@arm.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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)


Patches currently in stable-queue which might be from sboyd@codeaurora.org are

queue-4.2/arm-8425-1-kgdb-don-t-try-to-stop-the-machine-when-setting-breakpoints.patch
queue-4.2/arm-8401-1-perf-set-affinity-for-ppi-based-pmus.patch