Revert "defconfig update"

This reverts commit c84c7a17f13beb4f84bbf6df2da8076e66f60307.
Revert "defconfig update"

This reverts commit 2694ca18cd67c53a9302ba3e4c1bc5c6bf7388e8.
Revert "lowmemorykiller.c: convert to use for_each_thread"

This reverts commit 4712ace12d8f6f4f7a7a84d490a1455cc64be6b7.
Revert "introduce for_each_thread() to replace the buggy while_each_thread()"

This reverts commit cd2d79c772a40bfdc75b5f159cb6d62e3b1542f4.
Revert "mm, oom: base root bonus on current usage"

This reverts commit d36db0e47683ee9b2b1d3a5be16a7a88600ce377.
Revert "mm, oom: prefer thread group leaders for display purposes"

This reverts commit 916e0842f205efc337522b55e6c4c596982185e9.
Revert "oom_kill: add rcu_read_lock() into find_lock_task_mm()"

This reverts commit 5f81f734a5e4c253237511146b4215194dfcb4a5.
Revert "oom_kill: has_intersects_mems_allowed() needs rcu_read_lock()"

This reverts commit 63473da163a5b8b0e891d66355a538c566776b28.
Revert "oom_kill: change oom_kill.c to use for_each_thread()"

This reverts commit 00ad94a7508655eaa811730cccc9b60f8c8dd083.
Revert "mm/oom_kill: remove weird use of ERR_PTR()/PTR_ERR()."

This reverts commit fb306beb1ca9ad586d128c6789dc26f9f4fa3920.
Revert "mm, oom: cleanup pagefault oom handler"

This reverts commit b613c8249f58b155a3f5f805bc2c2bb8b30d4471.
Revert "oom: use N_MEMORY instead N_HIGH_MEMORY"

This reverts commit f2db1e111769316763915f2cf653cc65be43d7f7.
Revert "mm, oom: allow exiting threads to have access to memory reserves"

This reverts commit 64eefec49f54ca60674fb704deb8756d0b04b1a5.
Revert "Revert "lowmemorykiller: reduce swap significance by 1/2""

This reverts commit 5ea1b5838d74493d780435684f1674337c583c1c.
Revert "sched/fair: Optimize cgroup pick_next_task_fair()"

This reverts commit b0522fd3d3083b1dc65673287a43476b6d76bb52.
Revert "sched/fair: Optimize find_busiest_queue()"

This reverts commit 56cb96efeb6cb1a90b39f16158f1683f85c61bdf.
Revert "lowmemorykiller: reduce swap significance by 1/2"

This reverts commit 0b1ca37417966da6a54f2e236472892c49b0aa32.
Revert "mm, memcg: move all oom handling to memcontrol.c"

This reverts commit e15f96274587516e395b6c53f4b9403013301801.
Revert "mm, oom: reduce dependency on tasklist_lock"

This reverts commit 5b5ed3c16bd0027abc243c81b3a2ea3b357877c5.
Revert "mm, memcg: introduce own oom handler to iterate only over its own threads"

This reverts commit ce3ebfa5a09afc31704924c18a45bc67b8ea9b86.