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4a4fedb8a5
modify_return's fmod_ret programs can override bpf_modify_return_test()'s return value, which conflicts with get_func_ip_test when selftests run in parallel. Store current tgid in BSS and make modify_return hooks act only for that tgid. For other tasks, fentry/fexit become no-ops and fmod_ret returns the original ret. Drop the serial-only restriction and remove the TODO comment. Tested: sudo ./test_progs -t modify_return sudo ./test_progs -t get_func_ip_test sudo ./test_progs -j$(nproc) -t modify_return sudo ./test_progs -j$(nproc) -t get_func_ip_test Signed-off-by: Sun Jian <sun.jian.kdev@gmail.com> Link: https://lore.kernel.org/r/20260313034540.255805-1-sun.jian.kdev@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>