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SubjectRe: [PATCH] add safe version of list_for_each_entry() to list.h
Date
On Friday 04 October 2002 08:58, Christoph Hellwig wrote:
> > + */
> > +#define list_for_each_entry_safe(pos, n, head, member) \
> > + for (pos = list_entry((head)->next, typeof(*pos), member), \
> > + n = list_entry(pos->member.next, typeof(*pos), member); \
> > + &pos->member != (head); \
> > + pos = n, \
> > + n = list_entry(pos->member.next, typeof(*pos), member))
>
> Identation looks a little strange..

Dammit. Forgot to insert the patch. Here goes again.

--
Kevin Corry
corryk@us.ibm.com
http://evms.sourceforge.net/

======================================================
diff -Naur linux-2.5.40a/include/linux/list.h linux-2.5.40b/include/linux/list.h
--- linux-2.5.40a/include/linux/list.h Fri Oct 4 08:45:54 2002
+++ linux-2.5.40b/include/linux/list.h Fri Oct 4 08:45:31 2002
@@ -137,6 +137,15 @@
return head->next == head;
}

+/**
+ * list_member - tests whether a list member is currently on a list
+ * @member: member to evaulate
+ */
+static inline int list_member(struct list_head *member)
+{
+ return member->next && member->prev;
+}
+
static inline void __list_splice(struct list_head *list,
struct list_head *head)
{
@@ -240,6 +249,20 @@
&pos->member != (head); \
pos = list_entry(pos->member.next, typeof(*pos), member), \
prefetch(pos->member.next))
+
+/**
+ * list_for_each_entry_safe - iterate over list safe against removal of list entry
+ * @pos: the type * to use as a loop counter.
+ * @n: another type * to use as temporary storage
+ * @head: the head for your list.
+ * @member: the name of the list_struct within the struct.
+ */
+#define list_for_each_entry_safe(pos, n, head, member) \
+ for (pos = list_entry((head)->next, typeof(*pos), member), \
+ n = list_entry(pos->member.next, typeof(*pos), member); \
+ &pos->member != (head); \
+ pos = n, \
+ n = list_entry(pos->member.next, typeof(*pos), member))

#endif /* __KERNEL__ || _LVM_H_INCLUDE */

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