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Introduce bpf_map_memcg_enter() and bpf_map_memcg_exit() helpers to reduce code duplication in memcg context management. bpf_map_memcg_enter() gets the memcg from the map, sets it as active, and returns both the previous and the now active memcg. bpf_map_memcg_exit() restores the previous active memcg and releases the reference obtained during enter. Signed-off-by: Puranjay Mohan <puranjay@kernel.org> Link: https://lore.kernel.org/r/20260102200230.25168-2-puranjay@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>