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printk: Make console_sem a semaphore not a pseudo mutex

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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@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Christoph Hellwig <hch@infradead.org>
LKML-Reference: <20100907125057.179587334@linutronix.de>
This commit is contained in:
Thomas Gleixner
2010-09-07 14:33:43 +00:00
parent 8192b1f6b1
commit 5b8c4f23c5
1 changed files with 2 additions and 2 deletions
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4
kernel/printk.c
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@@ -85,7 +85,7 @@ EXPORT_SYMBOL(oops_in_progress);
* provides serialisation for access to the entire console * provides serialisation for access to the entire console
* driver system. * driver system.
*/ */
static DECLARE_MUTEX(console_sem); static DEFINE_SEMAPHORE(console_sem);
struct console *console_drivers; struct console *console_drivers;
EXPORT_SYMBOL_GPL(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 */ /* If a crash is occurring, make sure we can't deadlock */
spin_lock_init(&logbuf_lock); spin_lock_init(&logbuf_lock);
/* And make sure that we print immediately */ /* And make sure that we print immediately */
init_MUTEX(&console_sem); sema_init(&console_sem, 1);
} }
#if defined(CONFIG_PRINTK_TIME) #if defined(CONFIG_PRINTK_TIME)