few memory hotplug fixes

[Resending with the mailing lists CCed - sorry for spamming]

Hi Andrew,
Oscar has reported two issue when playing with the memory hotplug [1][2]. The first one seems more serious and patch 1 should address it. In short we are overly optimistic about zone movable not containing any non-movable pages and after 72b39cfc4d75 ("mm, memory_hotplug: do not fail offlining too early") this can lead to a seemingly stuck (still interruptible by a signal) memory offline.

Patch 2 fixes an over-eager warning which is not harmful but surely annoying.

I know we are late in the release cycle but I guess both would be candidates for rc7. They are simple enough and they should be "obviously" correct. If you would like more time for them for testing then I am perfectly fine postponing to the next merge window of course.

[1] http://lkml.kernel.org/r/[email protected]
[2] http://lkml.kernel.org/r/[email protected]

Michal Hocko (2):
mm, memory_hotplug: make has_unmovable_pages more robust
mm: do not warn on offline nodes unless the specific node is explicitly requested

Diffstat

 include/linux/gfp.h |  2 +-
 mm/page_alloc.c     | 16 ++++++++++------
 2 files changed, 11 insertions(+), 7 deletions(-)