kstrtos64
err = kstrtos64(page, 10, &v);
if (kstrtos64(buf, 10, &val) < 0)
retval = kstrtos64(buf_ptr, 0, &alarm);
int rc = kstrtos64(str, 0, &tk_ntp_data[TIMEKEEPER_CORE].ntp_tick_adj);
TEST_OK(kstrtos64, s64, "%lld", test_s64_ok);
TEST_FAIL(kstrtos64, s64, "%lld", test_s64_fail);