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This is just the same as PAGE_ALIGN(), but rounds the address down, not up. Suggested-by: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: David Gow <davidgow@google.com> Acked-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Richard Weinberger <richard@nod.at>