linux-kernel - [PATCH -rt] printk: 'force_early_printk' boot param to help with debugging

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Date:	Fri, 02 Sep 2011 14:41:29 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH -rt] printk: 'force_early_printk' boot param to help with
 debugging

Subject: printk: 'force_early_printk' boot param to help with debugging
From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Date: Fri Sep 02 14:29:33 CEST 2011

Gives me an option to screw printk and actually see what the machine
says.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/n/tip-ykb97nsfmobq44xketrxs977@git.kernel.org
---
 kernel/printk.c |    7 +++++++
 1 file changed, 7 insertions(+)

Index: linux-2.6/kernel/printk.c
===================================================================
--- linux-2.6.orig/kernel/printk.c
+++ linux-2.6/kernel/printk.c
@@ -541,6 +541,13 @@ asmlinkage void early_printk(const char
  */
 static int __read_mostly printk_killswitch;
 
+static int __init force_early_printk_setup(char *str)
+{
+	printk_killswitch = 1;
+	return 0;
+}
+early_param("force_early_printk", force_early_printk_setup);
+
 void printk_kill(void)
 {
 	printk_killswitch = 1;

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