tree 9c238114f029d1d22bc55f47e8d95ef7335c540d
parent e843e280cbe218fc8387339806d344708dee348a
author Christoph Lameter <clameter@engr.sgi.com> 1142394619 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1142401382 -0800

[PATCH] page migration: fail if page is in a vma flagged VM_LOCKED

page migration currently simply retries a couple of times if try_to_unmap()
fails without inspecting the return code.

However, SWAP_FAIL indicates that the page is in a vma that has the
VM_LOCKED flag set (if ignore_refs ==1).  We can check for that return code
and avoid retrying the migration.

migrate_page_remove_references() now needs to return a reason why the
failure occured.  So switch migrate_page_remove_references to use -Exx
style error messages.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>