Use inline functions to access the per cpu bit.  Intoduce the notion of
"freezing" a slab to make things more understandable.
Signed-off-by: NChristoph Lameter <clameter@sgi.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>