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Add a new map ops ->map_mem_usage to print the memory usage of a bpf map. This is a preparation for the followup change. Signed-off-by: Yafang Shao <laoar.shao@gmail.com> Link: https://lore.kernel.org/r/20230305124615.12358-2-laoar.shao@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>