diff --git a/drivers/cxl/core/core.h b/drivers/cxl/core/core.h
index e0c9aac..1a50c0f 100644
--- a/drivers/cxl/core/core.h
+++ b/drivers/cxl/core/core.h
@@ -14,6 +14,8 @@ struct cxl_mem_query_commands;
 int cxl_query_cmd(struct cxl_memdev *cxlmd,
 		  struct cxl_mem_query_commands __user *q);
 int cxl_send_cmd(struct cxl_memdev *cxlmd, struct cxl_send_command __user *s);
+void __iomem *devm_cxl_iomap_block(struct device *dev, resource_size_t addr,
+				   resource_size_t length);
 
 int cxl_memdev_init(void);
 void cxl_memdev_exit(void);