| From d4645deab9b14911a4100d47eb89545bae4d3d90 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 059/256] 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 |
| |