diff -urNp --exclude CVS --exclude BitKeeper --exclude {arch} --exclude .arch-ids 2.4.23pre7/include/linux/mm.h race/include/linux/mm.h
--- 2.4.23pre7/include/linux/mm.h	2003-10-10 08:08:27.000000000 +0200
+++ race/include/linux/mm.h	2003-10-11 17:32:02.000000000 +0200
@@ -322,11 +322,9 @@ typedef struct page {
 #define TryLockPage(page)	test_and_set_bit(PG_locked, &(page)->flags)
 #define PageChecked(page)	test_bit(PG_checked, &(page)->flags)
 #define SetPageChecked(page)	set_bit(PG_checked, &(page)->flags)
-#define ClearPageChecked(page)	clear_bit(PG_checked, &(page)->flags)
 #define PageLaunder(page)	test_bit(PG_launder, &(page)->flags)
 #define SetPageLaunder(page)	set_bit(PG_launder, &(page)->flags)
 #define ClearPageLaunder(page)	clear_bit(PG_launder, &(page)->flags)
-#define ClearPageArch1(page)	clear_bit(PG_arch_1, &(page)->flags)
 
 /*
  * The zone field is never updated after free_area_init_core()
diff -urNp --exclude CVS --exclude BitKeeper --exclude {arch} --exclude .arch-ids 2.4.23pre7/mm/filemap.c race/mm/filemap.c
--- 2.4.23pre7/mm/filemap.c	2003-10-10 08:08:32.000000000 +0200
+++ race/mm/filemap.c	2003-10-11 17:48:32.000000000 +0200
@@ -656,19 +656,10 @@ static inline void __add_to_page_cache(s
 	struct address_space *mapping, unsigned long offset,
 	struct page **hash)
 {
-	/*
-	 * Yes this is inefficient, however it is needed.  The problem
-	 * is that we could be adding a page to the swap cache while
-	 * another CPU is also modifying page->flags, so the updates
-	 * really do need to be atomic.  -- Rik
-	 */
-	ClearPageUptodate(page);
-	ClearPageError(page);
-	ClearPageDirty(page);
-	ClearPageReferenced(page);
-	ClearPageArch1(page);
-	ClearPageChecked(page);
-	LockPage(page);
+	unsigned long flags;
+
+	flags = page->flags & ~(1 << PG_uptodate | 1 << PG_error | 1 << PG_dirty | 1 << PG_referenced | 1 << PG_arch_1 | 1 << PG_checked);
+	page->flags = flags | (1 << PG_locked);
 	page_cache_get(page);
 	page->index = offset;
 	add_page_to_inode_queue(mapping, page);
@@ -690,6 +681,7 @@ int add_to_page_cache_unique(struct page
 	int err;
 	struct page *alias;
 
+	spin_lock(&pagemap_lru_lock);
 	spin_lock(&pagecache_lock);
 	alias = __find_page_nolock(mapping, offset, *hash);
 
@@ -700,6 +692,7 @@ int add_to_page_cache_unique(struct page
 	}
 
 	spin_unlock(&pagecache_lock);
+	spin_unlock(&pagemap_lru_lock);
 	if (!err)
 		lru_cache_add(page);
 	return err;
diff -urNp --exclude CVS --exclude BitKeeper --exclude {arch} --exclude .arch-ids 2.4.23pre7/mm/page_alloc.c race/mm/page_alloc.c
--- 2.4.23pre7/mm/page_alloc.c	2003-10-10 08:08:32.000000000 +0200
+++ race/mm/page_alloc.c	2003-10-11 17:32:02.000000000 +0200
@@ -109,8 +109,7 @@ static void __free_pages_ok (struct page
 		BUG();
 	if (PageActive(page))
 		BUG();
-	ClearPageReferenced(page);
-	ClearPageDirty(page);
+	page->flags &= ~((1<<PG_referenced) | (1<<PG_dirty));
 
 	if (current->flags & PF_FREE_PAGES)
 		goto local_freelist;