bpf_helper_call
if (bpf_helper_call(call)) {
if (bpf_helper_call(insn)) {
return (bpf_helper_call(insn) && is_sync_callback_calling_function(insn->imm)) ||
return (bpf_helper_call(insn) && is_async_callback_calling_function(insn->imm)) ||
if (bpf_helper_call(insn) && insn->imm == BPF_FUNC_timer_set_callback)