This is a note to let you know that I've just added the patch titled
clocksource: Exynos_mct: Use irq_force_affinity() in cpu bringup
to the 3.14-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:
clocksource-exynos_mct-use-irq_force_affinity-in-cpu-bringup.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 30ccf03b4a6a2102a2219058bdc6d779dc637dd7 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Date: Wed, 16 Apr 2014 14:36:45 +0000
Subject: clocksource: Exynos_mct: Use irq_force_affinity() in cpu bringup
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
commit 30ccf03b4a6a2102a2219058bdc6d779dc637dd7 upstream.
The starting cpu is not yet in the online mask so irq_set_affinity()
fails which results in per cpu timers for this cpu ending up on some
other online cpu, ususally cpu 0.
Use irq_force_affinity() which disables the online mask check and
makes things work.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Tested-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Cc: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
Cc: Tomasz Figa <t.figa@xxxxxxxxxxx>,
Cc: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>,
Cc: Kukjin Kim <kgene.kim@xxxxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx,
Link: http://lkml.kernel.org/r/20140416143316.106665251@xxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/clocksource/exynos_mct.c | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -432,6 +432,7 @@ static int exynos4_local_timer_setup(str
evt->irq);
return -EIO;
}
+ irq_force_affinity(mct_irqs[MCT_L0_IRQ + cpu], cpumask_of(cpu));
} else {
enable_percpu_irq(mct_irqs[MCT_L0_IRQ], 0);
}
@@ -452,7 +453,6 @@ static int exynos4_mct_cpu_notify(struct
unsigned long action, void *hcpu)
{
struct mct_clock_event_device *mevt;
- unsigned int cpu;
/*
* Grab cpu pointer in each case to avoid spurious
@@ -463,12 +463,6 @@ static int exynos4_mct_cpu_notify(struct
mevt = this_cpu_ptr(&percpu_mct_tick);
exynos4_local_timer_setup(&mevt->evt);
break;
- case CPU_ONLINE:
- cpu = (unsigned long)hcpu;
- if (mct_int_type == MCT_INT_SPI)
- irq_set_affinity(mct_irqs[MCT_L0_IRQ + cpu],
- cpumask_of(cpu));
- break;
case CPU_DYING:
mevt = this_cpu_ptr(&percpu_mct_tick);
exynos4_local_timer_stop(&mevt->evt);
Patches currently in stable-queue which might be from tglx@xxxxxxxxxxxxx are
queue-3.14/genirq-allow-forcing-cpu-affinity-of-interrupts.patch
queue-3.14/futex-add-another-early-deadlock-detection-check.patch
queue-3.14/clocksource-exynos_mct-use-irq_force_affinity-in-cpu-bringup.patch
queue-3.14/irqchip-gic-support-forced-affinity-setting.patch
queue-3.14/futex-prevent-attaching-to-kernel-threads.patch
queue-3.14/rtmutex-fix-deadlock-detector-for-real.patch
queue-3.14/clocksource-exynos_mct-register-clock-event-after-request_irq.patch
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