36 lines
1.1 KiB
Diff
36 lines
1.1 KiB
Diff
From 3332b30fd47e43bb91d5f56426f0ce3456bf8093 Mon Sep 17 00:00:00 2001
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From: Peter Zijlstra <a.p.zijlstra@chello.nl>
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Date: Fri, 2 Sep 2011 14:29:33 +0200
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Subject: [059/254] printk: 'force_early_printk' boot param to help with
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debugging
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Gives me an option to screw printk and actually see what the machine
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says.
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Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
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Link: http://lkml.kernel.org/r/1314967289.1301.11.camel@twins
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Link: http://lkml.kernel.org/n/tip-ykb97nsfmobq44xketrxs977@git.kernel.org
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---
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kernel/printk.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/kernel/printk.c b/kernel/printk.c
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index 5a172f9..300952e 100644
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--- a/kernel/printk.c
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+++ b/kernel/printk.c
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@@ -547,6 +547,13 @@ asmlinkage void early_printk(const char *fmt, ...)
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*/
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static bool __read_mostly printk_killswitch;
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+static int __init force_early_printk_setup(char *str)
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+{
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+ printk_killswitch = true;
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+ return 0;
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+}
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+early_param("force_early_printk", force_early_printk_setup);
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+
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void printk_kill(void)
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{
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printk_killswitch = true;
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