43 lines
1.5 KiB
Diff
43 lines
1.5 KiB
Diff
From 41b78fc339260091839e54f53feaa80d2551486d Mon Sep 17 00:00:00 2001
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Message-Id: <41b78fc339260091839e54f53feaa80d2551486d.1601675151.git.zanussi@kernel.org>
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In-Reply-To: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
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References: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
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From: Peter Zijlstra <peterz@infradead.org>
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Date: Fri, 2 Sep 2011 14:41:29 +0200
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Subject: [PATCH 058/333] printk: Add "force_early_printk" boot param to help
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with debugging
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.148-rt64.tar.xz
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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/printk.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
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index e14732bd316f..e582817249ce 100644
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--- a/kernel/printk/printk.c
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+++ b/kernel/printk/printk.c
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@@ -435,6 +435,13 @@ 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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--
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2.17.1
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