tree 721d935953c58ac014e3d00ea1092ab480ea3356
parent 6661672053aee709d93f5dbd7887c789364c11d4
author Andrea Arcangeli <aarcange@redhat.com> 1320106102 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1320107447 -0700

mremap: check for overflow using deltas

Using "- 1" relies on the old_end to be page aligned and PAGE_SIZE > 1,
those are reasonable requirements but the check remains obscure and it
looks more like an off by one error than an overflow check.  This I feel
will improve readability.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Johannes Weiner <jweiner@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>