Add list_prev_entry, list_next_entry

Signed-off-by: Geoff Levand <geoff@infradead.org>

diff --git a/lib/list/list.h b/lib/list/list.h
index d93f8a88021183a25ca3b4c35e8accca664b469b..7f9955f93115e2761fbe1b0ec94398480d40e8a8 100644 (file)
--- a/lib/list/list.h
+++ b/lib/list/list.h
@@ -27,14 +27,19 @@ struct list {
        ? NULL \
        : container_of(_ptr, _type, _member))
 
        ? NULL \
        : container_of(_ptr, _type, _member))
 

+#define list_prev_entry(_list, _pos, _member) \
+       list_entry(_pos->_member.prev, typeof(*_pos), _member, _list)
+
+#define list_next_entry(_list, _pos, _member) \
+       list_entry(_pos->_member.next, typeof(*_pos), _member, _list)
+

 #define list_for_each_entry(_list, _pos, _member) \
        for (_pos = list_entry((_list)->head.next, typeof(*_pos), _member, _list); \
 #define list_for_each_entry(_list, _pos, _member) \
        for (_pos = list_entry((_list)->head.next, typeof(*_pos), _member, _list); \

-               _pos; \
-               _pos = list_entry(_pos->_member.next, typeof(*_pos), _member, _list))
+               _pos; _pos = list_next_entry(_list, _pos, _member))

 
 #define list_for_each_entry_continue(_list, _pos, _member) \
 
 #define list_for_each_entry_continue(_list, _pos, _member) \

-       for (; _pos; \
-               _pos = list_entry(_pos->_member.next, typeof(*_pos), _member, _list))
+       for (; _pos; _pos = list_next_entry(_list, _pos, _member))
+

 
 #define STATIC_LIST(_list) static struct list _list = { \
        .head = { \
 
 #define STATIC_LIST(_list) static struct list _list = { \
        .head = { \