Remove the volatile from cpus_in_xmon, and put a barrier() in the loop that
waits for the other cpus to come in to xmon.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>