This patch causes a warning I hadn't spotted before sending it out.
Could you fold this in please?

diff --git a/drivers/firmware/efi/arm-runtime.c

b/drivers/firmware/efi/arm-runtime.c
index 6c97d4884fc7..fe749da9997e 100644

--- a/drivers/firmware/efi/arm-runtime.c
+++ b/drivers/firmware/efi/arm-runtime.c

@@ -72,8 +72,8 @@ static bool __init efi_virtmap_init(void)
                 */
                if (efi_system_table >= phys &&
                    efi_system_table < phys + (md->num_pages * EFI_PAGE_SIZE)) {
-                       efi.systab = (void *)(efi_system_table - phys +
-                                             md->virt_addr);
+                       efi.systab = (void *)(unsigned long)(efi_system_table -
+                                                         phys + md->virt_addr);
                        systab_found = true;
                }
        }