linux-kernel - [tip:perf/core] perf, cpu hotplug: Run CPU

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Date:	Wed, 24 Oct 2012 02:39:47 -0700
From:	"tip-bot for Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
	hpa@...or.com, mingo@...nel.org, srivatsa.bhat@...ux.vnet.ibm.com,
	tglx@...utronix.de
Subject: [tip:perf/core] perf, cpu hotplug:
  Run CPU_STARTING notifiers with irqs disabled

Commit-ID:  6760bca9fd16256210f4922a3e9f067d2c7017d7
Gitweb:     http://git.kernel.org/tip/6760bca9fd16256210f4922a3e9f067d2c7017d7
Author:     Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
AuthorDate: Tue, 16 Oct 2012 13:28:10 +0530
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 24 Oct 2012 10:01:58 +0200

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>
Reviewed-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: peterz@...radead.org
Cc: acme@...stprotocols.net
Link: http://lkml.kernel.org/r/20121016075809.3572.47848.stgit@srivatsabhat.in.ibm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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 2e90235..0647805 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -803,10 +803,13 @@ 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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