diff --git a/drivers/char/drm/drmP.h b/drivers/char/drm/drmP.h
index cf58a526a030db783b99a2357b9f6b86221b56ea..79221783a14c082895ec2de2ca33b68e5a5792ed 100644
--- a/drivers/char/drm/drmP.h
+++ b/drivers/char/drm/drmP.h
@@ -228,9 +228,9 @@
 /** \name Internal types and structures */
 /*@{*/
 
-#define DRM_ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
-#define DRM_MIN(a,b) ((a)<(b)?(a):(b))
-#define DRM_MAX(a,b) ((a)>(b)?(a):(b))
+#define DRM_ARRAY_SIZE(x) ARRAY_SIZE(x)
+#define DRM_MIN(a,b) min(a,b)
+#define DRM_MAX(a,b) max(a,b)
 
 #define DRM_LEFTCOUNT(x) (((x)->rp + (x)->count - (x)->wp) % ((x)->count + 1))
 #define DRM_BUFCOUNT(x) ((x)->count - DRM_LEFTCOUNT(x))