Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755642AbaFIJ0V (ORCPT ); Mon, 9 Jun 2014 05:26:21 -0400 Received: from ip4-83-240-18-248.cust.nbox.cz ([83.240.18.248]:59137 "EHLO ip4-83-240-18-248.cust.nbox.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755187AbaFIJ0T (ORCPT ); Mon, 9 Jun 2014 05:26:19 -0400 From: Jiri Slaby To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Thomas Gleixner , Kyungmin Park , Marek Szyprowski , Bartlomiej Zolnierkiewicz , Tomasz Figa , Daniel Lezcano , Kukjin Kim , linux-arm-kernel@lists.infradead.org, Jiri Slaby Subject: [PATCH 3.12 017/146] clocksource: Exynos_mct: Use irq_force_affinity() in cpu bringup Date: Mon, 9 Jun 2014 10:49:12 +0200 Message-Id: <0ba79d6efc90465ed75f41e723b27aff79a7baae.1402303820.git.jslaby@suse.cz> X-Mailer: git-send-email 1.9.3 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Thomas Gleixner 3.12-stable review patch. If anyone has any objections, please let me know. =============== 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 Tested-by: Krzysztof Kozlowski Cc: Kyungmin Park Cc: Marek Szyprowski Cc: Bartlomiej Zolnierkiewicz Cc: Tomasz Figa , Cc: Daniel Lezcano , Cc: Kukjin Kim Cc: linux-arm-kernel@lists.infradead.org, Link: http://lkml.kernel.org/r/20140416143316.106665251@linutronix.de Signed-off-by: Thomas Gleixner Signed-off-by: Jiri Slaby --- 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 62b0de6a1837..b17b3e0981f0 100644 --- a/drivers/clocksource/exynos_mct.c +++ b/drivers/clocksource/exynos_mct.c @@ -428,6 +428,7 @@ 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); } @@ -448,7 +449,6 @@ 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 @@ -459,12 +459,6 @@ 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); -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/