1 files changed, 1 insertions, 1 deletions

diff --git a/include/asm-generic/memory_model.h b/include/asm-generic/memory_model.h
index 8078cbd2c016..30d8d33491dd 100644
--- a/include/asm-generic/memory_model.h
+++ b/include/asm-generic/memory_model.h
@@ -54,7 +54,7 @@
 #define __page_to_pfn(pg)                                       \
 ({      struct page *__pg = (pg);                               \
         int __sec = page_to_section(__pg);                      \
-        __pg - __section_mem_map_addr(__nr_to_section(__sec));  \
+        (unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \
 })
 
 #define __pfn_to_page(pfn)                              \