X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=mm%2Frmap.c;h=059774712c0889fbe1ff08aabc43f7593760baec;hb=ff9bc512f198eb47204f55b24c6fe3d36ed89592;hp=99bc3f9cd796f34a58ec1d61798c27c583a0eaf3;hpb=e93dc4891df93d7efa59d861fdcbb529a1819343;p=linux-2.6

diff --git a/mm/rmap.c b/mm/rmap.c
index 99bc3f9cd7..059774712c 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -422,7 +422,7 @@ int page_referenced(struct page *page, int is_locked,
 			referenced += page_referenced_anon(page, mem_cont);
 		else if (is_locked)
 			referenced += page_referenced_file(page, mem_cont);
-		else if (TestSetPageLocked(page))
+		else if (!trylock_page(page))
 			referenced++;
 		else {
 			if (page->mapping)
@@ -658,6 +658,22 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma)
 			BUG();
 		}
 
+		/*
+		 * Now that the last pte has gone, s390 must transfer dirty
+		 * flag from storage key to struct page.  We can usually skip
+		 * this if the page is anon, so about to be freed; but perhaps
+		 * not if it's in swapcache - there might be another pte slot
+		 * containing the swap entry, but page not yet written to swap.
+		 */
+		if ((!PageAnon(page) || PageSwapCache(page)) &&
+		    page_test_dirty(page)) {
+			page_clear_dirty(page);
+			set_page_dirty(page);
+		}
+
+		mem_cgroup_uncharge_page(page);
+		__dec_zone_page_state(page,
+			PageAnon(page) ? NR_ANON_PAGES : NR_FILE_MAPPED);
 		/*
 		 * It would be tidy to reset the PageAnon mapping here,
 		 * but that might overwrite a racing page_add_anon_rmap
@@ -667,14 +683,6 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma)
 		 * Leaving it set also helps swapoff to reinstate ptes
 		 * faster for those pages still in swapcache.
 		 */
-		if (page_test_dirty(page)) {
-			page_clear_dirty(page);
-			set_page_dirty(page);
-		}
-		mem_cgroup_uncharge_page(page);
-
-		__dec_zone_page_state(page,
-				PageAnon(page) ? NR_ANON_PAGES : NR_FILE_MAPPED);
 	}
 }