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mm, memcg: fix mem_cgroup_swapout() for THPs
commitd08afa149a
upstream. Commitd6810d7300
("memcg, THP, swap: make mem_cgroup_swapout() support THP") changed mem_cgroup_swapout() to support transparent huge page (THP). However the patch missed one location which should be changed for correctly handling THPs. The resulting bug will cause the memory cgroups whose THPs were swapped out to become zombies on deletion. Link: http://lkml.kernel.org/r/20171128161941.20931-1-shakeelb@google.com Fixes:d6810d7300
("memcg, THP, swap: make mem_cgroup_swapout() support THP") Signed-off-by: Shakeel Butt <shakeelb@google.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Huang Ying <ying.huang@intel.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Greg Thelen <gthelen@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -6044,7 +6044,7 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
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memcg_check_events(memcg, page);
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if (!mem_cgroup_is_root(memcg))
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css_put(&memcg->css);
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css_put_many(&memcg->css, nr_entries);
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}
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/**
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