[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>