tree c038d9689edf1f03467227959f66c3ef750a9572
parent 90a5d5af74f6570af063fb6bff33c6b2f8361bbc
author Jacobo Giralt <jacobo.giralt@gmail.com> 1326236831 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1326241841 -0800

mm: migrate: one less atomic operation

migrate_page_move_mapping() drops a reference from the old page after
unfreezing its counter.  Both operations can be merged into a single
atomic operation by directly unfreezing to one less reference.

The same applies to migrate_huge_page_move_mapping().

Signed-off-by: Jacobo Giralt <jacobo.giralt@gmail.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Johannes Weiner <jweiner@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>