diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
index 70e13cf06ed0..f19d50bd8925 100644
--- a/drivers/base/cacheinfo.c
+++ b/drivers/base/cacheinfo.c
@@ -16,6 +16,8 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/acpi.h>
 #include <linux/bitops.h>
 #include <linux/cacheinfo.h>