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fd06ce2ce4
Ensure that zswap.writeback check goes up the cgroup tree, i.e. is hierarchical. Create a subcgroup which has zswap.writeback set to 1, and the upper hierarchy's restrictions shall apply. Link: https://lkml.kernel.org/r/20240823162506.12117-2-me@yhndnzj.com Signed-off-by: Mike Yuan <me@yhndnzj.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Michal Koutný <mkoutny@suse.com> Cc: Muchun Song <muchun.song@linux.dev> Cc: Nhat Pham <nphamcs@gmail.com> Cc: Roman Gushchin <roman.gushchin@linux.dev> Cc: Shakeel Butt <shakeel.butt@linux.dev> Cc: Yosry Ahmed <yosryahmed@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>