NR_ERRNO           18 tools/lib/bpf/libbpf_errno.c #define NR_ERRNO	(__LIBBPF_ERRNO__END - __LIBBPF_ERRNO__START)
NR_ERRNO         1614 tools/perf/util/bpf-loader.c #define NR_ERRNO	(__BPF_LOADER_ERRNO__END - __BPF_LOADER_ERRNO__START)