Switch the NUMA API to use compat_get_bitmap/compat_put_bitmap.  In order
to use compat_alloc_userspace instead of set_fs tricks, we have to do a few
copies.

This is what we are currently using on ppc64 but are willing to entertain
the idea of going to a 32bit bitmap, especially considering how much hoops
we have to go through to get it right in this patch.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>