bpf: let kprobe programs use bpf_get_smp_processor_id() helper
It's useful to do per-cpu histograms. Suggested-by: Daniel Wagner <daniel.wagner@bmw-carit.de> Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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