samples/bpf: move common-purpose trace functions to selftests
There is no functionality change in this patch. The common-purpose trace functions, including perf_event polling and ksym lookup, are moved from trace_output_user.c and bpf_load.c to selftests/bpf/trace_helpers.c so that these function can be reused later in selftests. Acked-by: NAlexei Starovoitov <ast@fb.com> Signed-off-by: NYonghong Song <yhs@fb.com> Signed-off-by: NAlexei Starovoitov <ast@kernel.org>
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