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x86 early_iounmap(): fix off-by-one error in page alignment of allocation size for sizes where size%PAGE_SIZE==1. Signed-off-by: Florian Zumbiehl <florz@florz.de> LKML-Reference: <201007202219.o6KMJlES021058@imap1.linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>