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Subject[PATCH] add safe version of list_for_each_entry() to list.h
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Date
Please consider adding the following patch to list.h.

The following patch adds list_for_each_entry_safe() and
list_member() to list.h.

- List_for_each_entry_safe adds a removal-safe version of this macro.
- List_member indicates if the container object is currently in a list.

Thanks.
Mark

diff -Naur old/include/linux/list.h new/include/linux/list.h
--- old/include/linux/list.h Thu Oct 3 18:06:42 2002
+++ new/include/linux/list.h Thu Oct 3 18:10:46 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) ? 0 : 1);
+}
+
static inline void __list_splice(struct list_head *list,
struct list_head *head)
{
@@ -241,6 +250,20 @@
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 */

#endif

-
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