VM: allow get_page_unless_zero on compound pages
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: NChristoph Lameter <clameter@sgi.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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