[PATCH] tmpfs: shmem_getpage missing flush_dcache_page

Patch from Hugh Dickins

From Matthew Wilcox <willy@debian.org>: shmem_getpage must
flush_dcache_page after allocating and clearing a new page.

mm/shmem.c

@@ -867,6 +867,7 @@ static int shmem_getpage(struct inode *inode, unsigned long idx, struct page **p
 		info->alloced++;
 		spin_unlock(&info->lock);
 		clear_highpage(page);
+		flush_dcache_page(page);
 		SetPageUptodate(page);
 	}