From 70ba4529b6eb2b34efa5eca4f5d1ab2433610a55 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Fri, 2 Sep 2011 14:41:29 +0200 Subject: [PATCH 069/352] printk: Add "force_early_printk" boot param to help with debugging Gives me an option to screw printk and actually see what the machine says. Change-Id: I5fb26ec86be9f4ff814aa893e73020d88d141fde Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/1314967289.1301.11.camel@twins Signed-off-by: Thomas Gleixner Link: http://lkml.kernel.org/n/tip-ykb97nsfmobq44xketrxs977@git.kernel.org --- kernel/printk/printk_safe.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/kernel/printk/printk_safe.c b/kernel/printk/printk_safe.c index 3c50299..03029bf 100644 --- a/kernel/printk/printk_safe.c +++ b/kernel/printk/printk_safe.c @@ -380,6 +380,13 @@ 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; -- 2.7.4