Currently, tracing fentry/fexit program return value can be anything, and these return values are actually ignored by trampoline codes. Let us force return value to be 0 to avoid confusion and allow possible future extension. Patch #1 is the kernel change and Patch #2 fixed the selftest. Yonghong Song (2): bpf: enforce returning 0 for fentry/fexit progs selftests/bpf: enforce returning 0 for fentry/fexit programs kernel/bpf/verifier.c | 7 +++++++ tools/testing/selftests/bpf/progs/test_overhead.c | 4 ++-- 2 files changed, 9 insertions(+), 2 deletions(-) -- 2.24.1
