linux-kernel - [tip:irq/urgent] clocksource: Exynos_mct: Use irq_force

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Message-ID: <tip-30ccf03b4a6a2102a2219058bdc6d779dc637dd7@git.kernel.org>
Date:	Thu, 17 Apr 2014 14:40:11 -0700
From:	tip-bot for Thomas Gleixner <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	k.kozlowski@...sung.com, kgene.kim@...sung.com,
	kyungmin.park@...sung.com, b.zolnierkie@...sung.com,
	m.szyprowski@...sung.com, tglx@...utronix.de
Subject: [tip:irq/urgent] clocksource: Exynos_mct: Use irq_force_affinity(
 ) in cpu bringup

Commit-ID:  30ccf03b4a6a2102a2219058bdc6d779dc637dd7
Gitweb:     http://git.kernel.org/tip/30ccf03b4a6a2102a2219058bdc6d779dc637dd7
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Wed, 16 Apr 2014 14:36:45 +0000
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Thu, 17 Apr 2014 23:36:28 +0200

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@...utronix.de>
Tested-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc: Kyungmin Park <kyungmin.park@...sung.com>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc: Tomasz Figa <t.figa@...sung.com>,
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>,
Cc: Kukjin Kim <kgene.kim@...sung.com>
Cc: linux-arm-kernel@...ts.infradead.org,
Cc: stable@...r.kernel.org
Link: http://lkml.kernel.org/r/20140416143316.106665251@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 drivers/clocksource/exynos_mct.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index a6ee6d7..b2d4163 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -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);
--
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