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Both slab defrag and the large blocksize patches need to ability to take refcounts on compound pages. May be useful in other places as well. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>