[PATCH stable 4.4 0/4] mm: workingset backports

[Michal Hocko]

Hi,
here is the backport of (hopefully) all workingset related fixes for
4.4 kernel. The series has been reviewed by Johannes [1]. The main
motivation for the backport is 22f2ac51b6d6 ("mm: workingset: fix crash
in shadow node shrinker caused by replace_page_cache_page()") which is
a fix for a triggered BUG_ON. This is not sufficient because there are
follow up fixes which were introduced later.