1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/serial/cpm_uart/cpm_uart_cpm2.c b/drivers/serial/cpm_uart/cpm_uart_cpm2.c
index a9802e76b5fa..814ac006393f 100644
--- a/drivers/serial/cpm_uart/cpm_uart_cpm2.c
+++ b/drivers/serial/cpm_uart/cpm_uart_cpm2.c
@@ -30,6 +30,7 @@
 #include <linux/module.h>
 #include <linux/tty.h>
 #include <linux/ioport.h>
+#include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/serial.h>
 #include <linux/console.h>
@@ -61,7 +62,7 @@ void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
         void __iomem *pram;
         unsigned long offset;
         struct resource res;
-        unsigned long len;
+        resource_size_t len;
 
         /* Don't remap parameter RAM if it has already been initialized
          * during console setup.
@@ -74,7 +75,7 @@ void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
         if (of_address_to_resource(np, 1, &res))
                 return NULL;
 
-        len = 1 + res.end - res.start;
+        len = resource_size(&res);
         pram = ioremap(res.start, len);
         if (!pram)
                 return NULL;