From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757321Ab0IGOgC (ORCPT ); Tue, 7 Sep 2010 10:36:02 -0400 Received: from www.tglx.de ([62.245.132.106]:43949 "EHLO www.tglx.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932250Ab0IGOd7 (ORCPT ); Tue, 7 Sep 2010 10:33:59 -0400 Message-Id: <20100907125057.179587334@linutronix.de> User-Agent: quilt/0.47-1 Date: Tue, 07 Sep 2010 14:33:43 -0000 From: Thomas Gleixner To: LKML Cc: Andrew Morton , Ingo Molnar , Peter Zijlstra , Christoph Hellwig Subject: [patch 26/30] printk: Make console_sem a semaphore not a pseudo mutex References: <20100907124636.880953480@linutronix.de> Content-Disposition: inline; filename=printk-console-sem-sema.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org It needs to be investigated whether it can be replaced by a real mutex, but that needs more thought. Signed-off-by: Thomas Gleixner --- kernel/printk.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) Index: linux-2.6/kernel/printk.c =================================================================== --- linux-2.6.orig/kernel/printk.c +++ linux-2.6/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)