38 lines
1.2 KiB
Diff
38 lines
1.2 KiB
Diff
Subject: printk: %27force_early_printk%27 boot param to help with debugging
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From: Peter Zijlstra <peterz@infradead.org>
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Date: Fri, 02 Sep 2011 14:41:29 +0200
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Subject: printk: 'force_early_printk' boot param to help with debugging
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From: Peter Zijlstra <a.p.zijlstra@chello.nl>
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Date: Fri Sep 02 14:29:33 CEST 2011
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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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Index: linux-3.2/kernel/printk.c
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===================================================================
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--- linux-3.2.orig/kernel/printk.c
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+++ linux-3.2/kernel/printk.c
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@@ -541,6 +541,13 @@ asmlinkage void early_printk(const char
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*/
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static int __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 = 1;
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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 = 1;
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