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We will store a flag in the lowest bit of sk->sk_memcg. Then, we cannot pass the raw pointer to mem_cgroup_under_socket_pressure(). Let's pass struct sock to it and rename the function to match other functions starting with mem_cgroup_sk_. Note that the helper is moved to sock.h to use mem_cgroup_from_sk(). Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Acked-by: Roman Gushchin <roman.gushchin@linux.dev> Acked-by: Shakeel Butt <shakeel.butt@linux.dev> Link: https://patch.msgid.link/20250815201712.1745332-10-kuniyu@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>