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[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: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar 2006-12-06 20:40:51 -08:00 committed by Linus Torvalds
parent 70e4506765
commit 7929082250
2 changed files with 17 additions and 1 deletions
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4
Documentation/kernel-parameters.txt
View File

@ -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.

14
kernel/printk.c
View File

@ -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 */