get_func_arg_reg
(is_kfunc_arg_mem_size(meta->btf, &args[arg + 1], get_func_arg_reg(caller, regs, arg + 1)) ||
is_kfunc_arg_const_mem_size(meta->btf, &args[arg + 1], get_func_arg_reg(caller, regs, arg + 1))))
struct bpf_reg_state *reg = get_func_arg_reg(caller, regs, i);
struct bpf_reg_state *size_reg = get_func_arg_reg(caller, regs, i + 1);
struct bpf_reg_state *reg = get_func_arg_reg(caller, regs, i);