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The struct task_struct's in_user_fault member is not used by the cgroup v2's memory controller, so it can be put under the CONFIG_MEMCG_V1 config option. To do so, mem_cgroup_enter_user_fault() and mem_cgroup_exit_user_fault() are moved under the CONFIG_MEMCG_V1 option as well. Link: https://lkml.kernel.org/r/20240628210317.272856-10-roman.gushchin@linux.dev Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev> Acked-by: Shakeel Butt <shakeel.butt@linux.dev> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Muchun Song <muchun.song@linux.dev> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>