linux-kernel - [tip:core/urgent] Revert "lockdep, timer: Fix del_timer

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Date:	Tue, 8 Feb 2011 15:51:46 GMT
From:	tip-bot for Peter Zijlstra <peterz@...radead.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	torvalds@...ux-foundation.org, a.p.zijlstra@...llo.nl,
	peterz@...radead.org, bp@...en8.de, tglx@...utronix.de,
	yong.zhang0@...il.com, mingo@...e.hu
Subject: [tip:core/urgent] Revert "lockdep, timer: Fix del_timer_sync() annotation"

Commit-ID:  7ff207928eb0761fa6b6c39eda82ac07a5241acf
Gitweb:     http://git.kernel.org/tip/7ff207928eb0761fa6b6c39eda82ac07a5241acf
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Tue, 8 Feb 2011 15:18:00 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Tue, 8 Feb 2011 16:18:39 +0100

Revert "lockdep, timer: Fix del_timer_sync() annotation"

Both attempts at trying to allow softirq usage for
del_timer_sync() failed (produced bogus warnings),
so revert the commit for this release:

  f266a5110d45: lockdep, timer: Fix del_timer_sync() annotation

and try again later.

Reported-by: Borislav Petkov <bp@...en8.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Yong Zhang <yong.zhang0@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
LKML-Reference: <1297174680.13327.107.camel@...top>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/timer.c |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/kernel/timer.c b/kernel/timer.c
index d53ce66..d645992 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -959,7 +959,7 @@ EXPORT_SYMBOL(try_to_del_timer_sync);
  *
  * Synchronization rules: Callers must prevent restarting of the timer,
  * otherwise this function is meaningless. It must not be called from
- * hardirq contexts. The caller must not hold locks which would prevent
+ * interrupt contexts. The caller must not hold locks which would prevent
  * completion of the timer's handler. The timer's handler must not call
  * add_timer_on(). Upon exit the timer is not queued and the handler is
  * not running on any CPU.
@@ -971,12 +971,10 @@ int del_timer_sync(struct timer_list *timer)
 #ifdef CONFIG_LOCKDEP
 	unsigned long flags;
 
-	raw_local_irq_save(flags);
-	local_bh_disable();
+	local_irq_save(flags);
 	lock_map_acquire(&timer->lockdep_map);
 	lock_map_release(&timer->lockdep_map);
-	_local_bh_enable();
-	raw_local_irq_restore(flags);
+	local_irq_restore(flags);
 #endif
 	/*
 	 * don't use it in hardirq context, because it
--
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