linux-kernel - [PATCH 1/2] perf, cpu hotplug: Run CPU_STARTING notifiers with irqs disabled

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Message-ID: <20120913144220.3426.22392.stgit@srivatsabhat.in.ibm.com>
Date:	Thu, 13 Sep 2012 20:12:20 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	a.p.zijlstra@...llo.nl, acme@...radead.org
Cc:	mingo@...nel.org, paulus@...ba.org, linux-kernel@...r.kernel.org,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Subject: [PATCH 1/2] perf,
 cpu hotplug: Run CPU_STARTING notifiers with irqs disabled

The CPU_STARTING notifiers are supposed to be run with irqs disabled. But the
perf_cpu_notifier() macro invokes them without doing that. Fix it.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---

 include/linux/perf_event.h |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 7602ccb..cc4574d 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1346,10 +1346,13 @@ static inline void perf_event_task_tick(void)				{ }
 do {									\
 	static struct notifier_block fn##_nb __cpuinitdata =		\
 		{ .notifier_call = fn, .priority = CPU_PRI_PERF };	\
+	unsigned long flags;						\
 	fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE,			\
 		(void *)(unsigned long)smp_processor_id());		\
+	local_irq_save(flags);						\
 	fn(&fn##_nb, (unsigned long)CPU_STARTING,			\
 		(void *)(unsigned long)smp_processor_id());		\
+	local_irq_restore(flags);					\
 	fn(&fn##_nb, (unsigned long)CPU_ONLINE,				\
 		(void *)(unsigned long)smp_processor_id());		\
 	register_cpu_notifier(&fn##_nb);				\

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