[patch 6/6] mm: de-skew page refcounting

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



atomic_add_unless (atomic_inc_not_zero) no longer requires an offset
refcount to function correctly.

Signed-off-by: Nick Piggin <[email protected]>

Index: linux-2.6/include/linux/mm.h
===================================================================
--- linux-2.6.orig/include/linux/mm.h
+++ linux-2.6/include/linux/mm.h
@@ -294,7 +294,7 @@ struct page {
  */
 static inline int put_page_testzero(struct page *page)
 {
-	BUG_ON(atomic_read(&page->_count) == -1);
+	BUG_ON(atomic_read(&page->_count) == 0);
 	return atomic_dec_and_test(&page->_count);
 }
 
@@ -304,10 +304,10 @@ static inline int put_page_testzero(stru
  */
 static inline int get_page_unless_zero(struct page *page)
 {
-	return atomic_add_unless(&page->_count, 1, -1);
+	return atomic_inc_not_zero(&page->_count);
 }
 
-#define set_page_count(p,v) 	atomic_set(&(p)->_count, (v) - 1)
+#define set_page_count(p,v) 	atomic_set(&(p)->_count, (v))
 #define __put_page(p)		atomic_dec(&(p)->_count)
 
 extern void FASTCALL(__page_cache_release(struct page *));
@@ -316,7 +316,7 @@ static inline int page_count(struct page
 {
 	if (PageCompound(page))
 		page = (struct page *)page_private(page);
-	return atomic_read(&page->_count) + 1;
+	return atomic_read(&page->_count);
 }
 
 static inline void get_page(struct page *page)
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux