reproduce: git remote add perf-tools-next https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git git fetch perf-tools-next perf-tools-next git checkout perf-tools-next/perf-tools-next b4 shazam https://lore.kernel.org/r/20240401062724.1006010-3-yangjihong@bytedance.com make W=1 O=/tmp/kselftest headers make W=1 O=/tmp/kselftest -C tools/testing/selftests make W=1 O=/tmp/kselftest -C tools/testing/selftests/bpf