PowerPC: Disable SLUB for configurations in which slab page structs are modified

PowerPC: Disable SLUB for configurations in which slab page structs are modified

PowerPC uses the slab allocator to manage the lowest level of the page
table.  In high cpu configurations we also use the page struct to split the
page table lock.  Disallow the selection of SLUB for that case.

Signed-off-by: Christoph Lameter <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Paul Mackerras <[email protected]>
Acked-by: Benjamin Herrenschmidt <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>