bpf_kfunc_call_test1
a = bpf_kfunc_call_test1((struct sock *)sk, 1, a | 2, 3, a | 4);
return (__u32)bpf_kfunc_call_test1((struct sock *)sk, 1, 2, 3, 4);
BTF_ID_FLAGS(func, bpf_kfunc_call_test1)
__u64 bpf_kfunc_call_test1(struct sock *sk, __u32 a, __u64 b,