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From 0e930a2c49d305a6838e9e462d8296e507d7c65c Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Fri, 2 Sep 2011 14:29:33 +0200
Subject: [PATCH 059/274] printk: 'force_early_printk' boot param to help with
debugging
Gives me an option to screw printk and actually see what the machine
says.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1314967289.1301.11.camel@twins
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/n/tip-ykb97nsfmobq44xketrxs977@git.kernel.org
---
kernel/printk.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/kernel/printk.c b/kernel/printk.c
index 5a172f9..300952e 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -547,6 +547,13 @@ asmlinkage void early_printk(const char *fmt, ...)
*/
static bool __read_mostly printk_killswitch;
+static int __init force_early_printk_setup(char *str)
+{
+ printk_killswitch = true;
+ return 0;
+}
+early_param("force_early_printk", force_early_printk_setup);
+
void printk_kill(void)
{
printk_killswitch = true;
--
1.7.10.4
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