[PATCH] micro-opt DEBUG_ADD_PAGE

[Hugh Dickins]

On Tue, 6 Feb 2001, Linus Torvalds wrote:
> > -		if (bh->b_size % correct_size) {
> > +		if (bh->b_size != correct_size) {
> 
> Actually, I'd rather leave it in, but speed it up with the saner and
> faster  	if (bh->b_size & (correct_size-1)) {

Micro-optimization season?

--- linux-2.4.2-pre1/include/linux/swap.h	Wed Feb  7 15:21:13 2001
+++ linux/include/linux/swap.h	Wed Feb  7 17:21:25 2001
@@ -200,8 +200,8 @@
  * with the pagemap_lru_lock held!
  */
 #define DEBUG_ADD_PAGE \
-	if (PageActive(page) || PageInactiveDirty(page) || \
-					PageInactiveClean(page)) BUG();
+	if ((page)->flags & ((1<<PG_active)|(1<<PG_inactive_dirty)| \
+					(1<<PG_inactive_clean))) BUG();
 
 #define ZERO_PAGE_BUG \
 	if (page_count(page) == 0) BUG();