linux-kernel - [tip:core/locking] printk: Make console

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Message-ID: <tip-5b8c4f23c54edda640a4850bc9b81dee70acb525@git.kernel.org>
Date:	Tue, 12 Oct 2010 15:53:07 GMT
From:	tip-bot for Thomas Gleixner <tglx@...utronix.de>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	peterz@...radead.org, tglx@...utronix.de, hch@...radead.org
Subject: [tip:core/locking] printk: Make console_sem a semaphore not a pseudo mutex

Commit-ID:  5b8c4f23c54edda640a4850bc9b81dee70acb525
Gitweb:     http://git.kernel.org/tip/5b8c4f23c54edda640a4850bc9b81dee70acb525
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Tue, 7 Sep 2010 14:33:43 +0000
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 12 Oct 2010 17:36:10 +0200

printk: Make console_sem a semaphore not a pseudo mutex

It needs to be investigated whether it can be replaced by a real
mutex, but that needs more thought.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Christoph Hellwig <hch@...radead.org>
LKML-Reference: <20100907125057.179587334@...utronix.de>

---
 kernel/printk.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/printk.c b/kernel/printk.c
index 8fe465a..2531017 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -85,7 +85,7 @@ EXPORT_SYMBOL(oops_in_progress);
  * provides serialisation for access to the entire console
  * driver system.
  */
-static DECLARE_MUTEX(console_sem);
+static DEFINE_SEMAPHORE(console_sem);
 struct console *console_drivers;
 EXPORT_SYMBOL_GPL(console_drivers);
 
@@ -556,7 +556,7 @@ static void zap_locks(void)
 	/* If a crash is occurring, make sure we can't deadlock */
 	spin_lock_init(&logbuf_lock);
 	/* And make sure that we print immediately */
-	init_MUTEX(&console_sem);
+	sema_init(&console_sem, 1);
 }
 
 #if defined(CONFIG_PRINTK_TIME)
--
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