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[PATCH] add ignore_loglevel boot option

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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 <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Ingo Molnar 2006-12-06 20:40:51 -08:00 • committed by Linus Torvalds
commit 7929082250
2 changed files with 17 additions and 1 deletions
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14
kernel/printk.c
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@ -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 */