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With this change, we know the precise rejected function name when attaching fexit/fmod_ret to __noreturn functions from log. $ ./fexit libbpf: prog 'fexit': BPF program load failed: -EINVAL libbpf: prog 'fexit': -- BEGIN PROG LOAD LOG -- Attaching fexit/fmod_ret to __noreturn function 'do_exit' is rejected. Suggested-by: Leon Hwang <leon.hwang@linux.dev> Signed-off-by: KaFai Wan <kafai.wan@linux.dev> Acked-by: Yafang Shao <laoar.shao@gmail.com> Acked-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/r/20250724151454.499040-2-kafai.wan@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>