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In the __arch_prepare_bpf_trampoline() function, retval_off is only meaningful when save_ret is true, so the current logic is correct. However, in the original logic, retval_off is only initialized under certain conditions; for example, in the fmod_ret logic, the compiler is not aware that the flags of the fmod_ret program (prog) have set BPF_TRAMP_F_CALL_ORIG, which results in an uninitialized symbol compilation warning. So initialize retval_off unconditionally to fix it. Signed-off-by: Chenghao Duan <duanchenghao@kylinos.cn> Reviewed-by: Pu Lehui <pulehui@huawei.com> Link: https://lore.kernel.org/r/20250922062244.822937-2-duanchenghao@kylinos.cn Signed-off-by: Alexei Starovoitov <ast@kernel.org>