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From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: 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
Subject: [patch 3/4] clocksource: exynos_mct: Use irq_force_affinity() in cpu bringup
Date: Wed, 16 Apr 2014 14:36:45 -0000
Message-ID: <20140416143316.106665251@linutronix.de> (raw)
In-Reply-To: <20140416142106.537575971@linutronix.de>


[-- Attachment #0: clocksource-exynos_mct-use-irq-force-affinity.patch --]
[-- Type: text/plain, Size: 1496 bytes --]

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>
---
 drivers/clocksource/exynos_mct.c |    8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

Index: tip/drivers/clocksource/exynos_mct.c
===================================================================
--- tip.orig/drivers/clocksource/exynos_mct.c
+++ tip/drivers/clocksource/exynos_mct.c
@@ -430,6 +430,7 @@ 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);
 	}
@@ -450,7 +451,6 @@ 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
@@ -461,12 +461,6 @@ 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);



  parent reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-04-16 14:36 [patch 0/4] genirq/exynos timers: Fix the CPU hotplug wreckage sanely Thomas Gleixner
2014-04-16 14:36 ` [patch 2/4] irqchip: gic: Support forced affinity setting Thomas Gleixner
2014-04-17 21:39   ` [tip:irq/urgent] irqchip: Gic: " tip-bot for Thomas Gleixner
2014-04-16 14:36 ` [patch 1/4] genirq: Allow forcing cpu affinity of interrupts Thomas Gleixner
2014-04-17 21:39   ` [tip:irq/urgent] " tip-bot for Thomas Gleixner
2014-04-16 14:36 ` [patch 4/4] clocksource: exynos_mct: Register clock event after request_irq() Thomas Gleixner
2014-04-17 21:40   ` [tip:irq/urgent] clocksource: Exynos_mct: " tip-bot for Krzysztof Kozlowski
2014-04-16 14:36 ` Thomas Gleixner [this message]
2014-04-17 21:40   ` [tip:irq/urgent] clocksource: Exynos_mct: Use irq_force_affinity( ) in cpu bringup tip-bot for Thomas Gleixner
2014-04-16 15:59 ` [patch 0/4] genirq/exynos timers: Fix the CPU hotplug wreckage sanely Krzysztof Kozlowski
2014-04-16 21:16   ` Thomas Gleixner

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