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clocksource: Exynos_mct: Use irq_force_affinity() in cpu bringup 

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@linutronix.de>
Tested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Tomasz Figa <t.figa@samsung.com>,
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>,
Cc: Kukjin Kim <kgene.kim@samsung.com>
Cc: linux-arm-kernel@lists.infradead.org,
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/20140416143316.106665251@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
hifive-unleashed-5.1
Thomas Gleixner 2014-04-16 14:36:45 +00:00
parent ffde1de640
commit 30ccf03b4a
1 changed files with 1 additions and 7 deletions
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8
drivers/clocksource/exynos_mct.c
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@ -430,6 +430,7 @@ static int exynos4_local_timer_setup(struct clock_event_device *evt)
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);
}
@ -450,7 +451,6 @@ static int exynos4_mct_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
{
struct mct_clock_event_device *mevt;
unsigned int cpu;
/*
* Grab cpu pointer in each case to avoid spurious
@ -461,12 +461,6 @@ static int exynos4_mct_cpu_notify(struct notifier_block *self,
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);