patch-2.4.10 linux/include/linux/list.h

• Lines: 37
• Date: Sun Sep 23 10:31:02 2001
• Orig file: v2.4.9/linux/include/linux/list.h
• Orig date: Fri Feb 16 16:06:17 2001

diff -u --recursive --new-file v2.4.9/linux/include/linux/list.h linux/include/linux/list.h
@@ -3,6 +3,8 @@
 
 #if defined(__KERNEL__) || defined(_LVM_H_INCLUDE)
 
+#include <linux/prefetch.h>
+
 /*
  * Simple doubly linked list implementation.
  *
@@ -90,6 +92,7 @@
 static __inline__ void list_del(struct list_head *entry)
 {
 	__list_del(entry->prev, entry->next);
+	entry->next = entry->prev = 0;
 }
 
 /**
@@ -147,7 +150,18 @@
  * @head:	the head for your list.
  */
 #define list_for_each(pos, head) \
-	for (pos = (head)->next; pos != (head); pos = pos->next)
+	for (pos = (head)->next, prefetch(pos->next); pos != (head); \
+        	pos = pos->next, prefetch(pos->next))
+        	
+/**
+ * list_for_each_safe	-	iterate over a list safe against removal of list entry
+ * @pos:	the &struct list_head to use as a loop counter.
+ * @n:		another &struct list_head to use as temporary storage
+ * @head:	the head for your list.
+ */
+#define list_for_each_safe(pos, n, head) \
+	for (pos = (head)->next, n = pos->next; pos != (head); \
+		pos = n, n = pos->next)
 
 #endif /* __KERNEL__ || _LVM_H_INCLUDE */