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| author |   Ingo Molnar <mingo@elte.hu> | 2006-12-06 20:40:51 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-07 08:39:47 -0800 |
| commit | 792908225064b1d841a8990b9d1d1cfc4e0e5bb2 (patch) | |
| tree | 3892ec82447727cf59b3cf5d37273b76d01b763c | |
| parent | [PATCH] lockdep: register_lock_class() fix (diff) | |
| download | linux-dev-792908225064b1d841a8990b9d1d1cfc4e0e5bb2.tar.xz linux-dev-792908225064b1d841a8990b9d1d1cfc4e0e5bb2.zip | |
[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>
| -rw-r--r-- | Documentation/kernel-parameters.txt | 4 | ||||
| -rw-r--r-- | kernel/printk.c | 14 |
2 files changed, 17 insertions, 1 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 2a40d9f6ffad..6b3c3e37a277 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -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. diff --git a/kernel/printk.c b/kernel/printk.c index c3d90a58e4c5..185bb45eacf7 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -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 */ |