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Subject: printk: Add "force_early_printk" boot param to help with debugging
From: Peter Zijlstra <peterz@infradead.org>
Date: Fri, 02 Sep 2011 14:41:29 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.15-rt12.tar.xz
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/printk.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -435,6 +435,13 @@ asmlinkage void early_printk(const char
*/
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;
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