linux-kernel - [tip:timers/core] clockevents: Remove extra local_irq_save() in clockevents_exchange

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Date:	Thu, 2 Apr 2015 05:29:48 -0700
From:	tip-bot for Thomas Gleixner <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	hpa@...or.com, tglx@...utronix.de, linux-kernel@...r.kernel.org,
	mingo@...nel.org, peterz@...radead.org, rafael.j.wysocki@...el.com
Subject: [tip:timers/core] clockevents: Remove extra local_irq_save()
  in clockevents_exchange_device()

Commit-ID:  db6f672ef11d7a3c5aa128a3c3e57c92580a25f7
Gitweb:     http://git.kernel.org/tip/db6f672ef11d7a3c5aa128a3c3e57c92580a25f7
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Wed, 25 Mar 2015 13:08:27 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 1 Apr 2015 14:22:59 +0200

clockevents: Remove extra local_irq_save() in clockevents_exchange_device()

Called with 'clockevents_lock' held and interrupts disabled
already.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/51005827.yXt5tjZMBs@vostro.rjw.lan
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/time/clockevents.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index 3531bee..b730027 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -595,14 +595,12 @@ void clockevents_handle_noop(struct clock_event_device *dev)
  * @old:	device to release (can be NULL)
  * @new:	device to request (can be NULL)
  *
- * Called from the notifier chain. clockevents_lock is held already
+ * Called from various tick functions with clockevents_lock held and
+ * interrupts disabled.
  */
 void clockevents_exchange_device(struct clock_event_device *old,
 				 struct clock_event_device *new)
 {
-	unsigned long flags;
-
-	local_irq_save(flags);
 	/*
 	 * Caller releases a clock event device. We queue it into the
 	 * released list and do a notify add later.
@@ -618,7 +616,6 @@ void clockevents_exchange_device(struct clock_event_device *old,
 		BUG_ON(new->state != CLOCK_EVT_STATE_DETACHED);
 		clockevents_shutdown(new);
 	}
-	local_irq_restore(flags);
 }
 
 /**
--
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