We've run into problems at 512p with the kernel log buffer wrapping and
overwriting some of the early boot output.  This is with a
CONFIG_LOG_BUF_SHIFT value of 20 (1MB).  The patch below just bumps the max
possible setting to 21 (2MB).
Signed-off-by: Greg Edwards <edwardsg@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>