Hardware multithreading for RS64 cpus is currently broken.  Anton sent me a
patch a few weeks ago, but it did not work.  So just hide the config option
for the time being.
Signed-off-by: Olaf Hering <olh@suse.de>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>