From: Andrew Morton <akpm@linux-foundation.org>

Cc: Fengguang Wu <wfg@mail.ustc.edu.cn>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/filemap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN mm/filemap.c~readahead-combine-file_ra_stateprev_index-prev_offset-into-prev_pos-fix mm/filemap.c
--- a/mm/filemap.c~readahead-combine-file_ra_stateprev_index-prev_offset-into-prev_pos-fix
+++ a/mm/filemap.c
@@ -1396,7 +1396,7 @@ retry_find:
 	 * Found the page and have a reference on it.
 	 */
 	mark_page_accessed(page);
-	ra->prev_pos = page->index << PAGE_CACHE_SHIFT;
+	ra->prev_pos = (loff_t)page->index << PAGE_CACHE_SHIFT;
 	vmf->page = page;
 	return ret | VM_FAULT_LOCKED;
 
_