mm/mglru: stop rotating offlined memcgs to the old generation

On Tue, Oct 27, 2026 at 06:06:06PM -0700, T.J. Mercier wrote: > lru_gen_offline_memcg() moves an offlining memcg to the head of the old > generation of the memcg LRU (MEMCG_LRU_OLD), so that global re