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Commit16a1d96835("mm/slab: remove mm/slab.c and slab_def.h") removed the SLAB allocator, the only allocator that implemented cpuset slab spreading. Commit61a182ab61("cgroup/cpuset: Remove cpuset_do_slab_mem_spread()") then removed the last task_spread_slab() caller. Commit3ab67a9ce8("cgroup/cpuset: Mark memory_spread_slab as obsolete") marked the legacy control obsolete. cpuset still updates PFA_SPREAD_SLAB when tasks attach to a legacy cpuset and walks all tasks in a cpuset when memory_spread_slab changes. Remove the unused task flag and its helpers, and make spread task updates depend only on memory_spread_page. Keep the memory_spread_slab control and CS_SPREAD_SLAB state so legacy users retain the existing write, readback and inheritance behavior. Update the comments and documentation to describe only page-cache spreading as functional. Assisted-by: LLM Signed-off-by: Guopeng Zhang <zhangguopeng@kylinos.cn> Reviewed-by: Waiman Long <longman@redhat.com> Signed-off-by: Tejun Heo <tj@kernel.org>