This will help only on gcc 4+.  On older gccs there is a workaround too, but
it is so ugly and there are no actual observed failures that I didn't apply
it.
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: <rth@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>