printk-Make-console_sem-a-semaphore-not-a-pseudo-mut.patch

From 9868cc33e569ae8b78f7859e74f245f979a20a1f Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 26 Jul 2009 00:35:13 +0200
Subject: [PATCH] printk: Make console_sem a semaphore not a pseudo mutex

commit c94aff2e932748c416c6b70d708b9f146bcf86c9 in tip.

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

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/kernel/printk.c b/kernel/printk.c
index 1751c45..8ae415b 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -83,7 +83,7 @@ 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);
 
@@ -544,7 +544,7 @@ 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);
+	semaphore_init(&console_sem);
 }
 
 #if defined(CONFIG_PRINTK_TIME)
-- 
1.7.1.1