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Commit 79290822 authored by Ingo Molnar's avatar Ingo Molnar Committed by Linus Torvalds
Browse files

[PATCH] add ignore_loglevel boot option 



Sometimes the kernel prints something interesting while userspace bootup
keeps messages turned off via loglevel.  Enable the printing of /all/
kernel messages via the "ignore_loglevel" boot option.  Off by default.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 70e45067

Documentation/kernel-parameters.txt

+4 −0
Original line number Diff line number Diff line
@@ -650,6 +650,10 @@ and is between 256 and 4096 characters. It is defined in the file 
	idle=		[HW]

			Format: idle=poll or idle=halt



	ignore_loglevel	[KNL]

			Ignore loglevel setting - this will print /all/

			kernel messages to the console. Useful for debugging.



	ihash_entries=	[KNL]

			Set number of hash buckets for inode cache.

kernel/printk.c

+13 −1
Original line number Diff line number Diff line
@@ -333,13 +333,25 @@ static void __call_console_drivers(unsigned long start, unsigned long end) 
	}

}



static int __read_mostly ignore_loglevel;



int __init ignore_loglevel_setup(char *str)

{

	ignore_loglevel = 1;

	printk(KERN_INFO "debug: ignoring loglevel setting.\n");



	return 1;

}



__setup("ignore_loglevel", ignore_loglevel_setup);



/*

 * Write out chars from start to end - 1 inclusive

 */

static void _call_console_drivers(unsigned long start,

				unsigned long end, int msg_log_level)

{

	if (msg_log_level < console_loglevel &&

	if ((msg_log_level < console_loglevel || ignore_loglevel) &&

			console_drivers && start != end) {

		if ((start & LOG_BUF_MASK) > (end & LOG_BUF_MASK)) {

			/* wrapped write */