kstrtou64_from_user
rc = kstrtou64_from_user(buf, count, 16, &value);
ret = kstrtou64_from_user(user_buf, size, 0, &trace_hw_component_mask);
ret = kstrtou64_from_user(ubuf, size, 0, &val);
ret = kstrtou64_from_user(ubuf, size, 0, &val);
ret = kstrtou64_from_user(userbuf, count, 16, &pn);