bpf: Introduce bpf_map ID
This patch generates an unique ID for each created bpf_map. The approach is similar to the earlier patch for bpf_prog ID. It is worth to note that the bpf_map's ID and bpf_prog's ID are in two independent ID spaces and both have the same valid range: [1, INT_MAX). Signed-off-by: NMartin KaFai Lau <kafai@fb.com> Acked-by: NAlexei Starovoitov <ast@fb.com> Acked-by: NDaniel Borkmann <daniel@iogearbox.net> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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