diff --git a/drivers/gpu/drm/drm_memory.c b/drivers/gpu/drm/drm_memory.c
index 7ca500b8c399518fc0e4a01898a7ab75ddd47967..3c54044214dbb5c1fbfc47efb59bbe0537448f33 100644
--- a/drivers/gpu/drm/drm_memory.c
+++ b/drivers/gpu/drm/drm_memory.c
@@ -153,7 +153,7 @@ EXPORT_SYMBOL(drm_legacy_ioremapfree);
 u64 drm_get_max_iomem(void)
 {
 	struct resource *tmp;
-	u64 max_iomem = 0;
+	resource_size_t max_iomem = 0;
 
 	for (tmp = iomem_resource.child; tmp; tmp = tmp->sibling) {
 		max_iomem = max(max_iomem,  tmp->end);