From c8af5cd75e2411d5a5aacf115f59a5ff6b87f3fa Mon Sep 17 00:00:00 2001 From: =?utf8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= Date: Fri, 28 Jun 2019 11:12:34 +0200 Subject: [PATCH] xskmap: Move non-standard list manipulation to helper MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Add a helper in list.h for the non-standard way of clearing a list that is used in xskmap. This makes it easier to reuse it in the other map types, and also makes sure this usage is not forgotten in any list refactorings in the future. Signed-off-by: Toke Høiland-Jørgensen Signed-off-by: Daniel Borkmann --- include/linux/list.h | 14 ++++++++++++++ kernel/bpf/xskmap.c | 3 +-- 2 files changed, 15 insertions(+), 2 deletions(-) diff --git a/include/linux/list.h b/include/linux/list.h index e951228db4b2..85c92555e31f 100644 --- a/include/linux/list.h +++ b/include/linux/list.h @@ -106,6 +106,20 @@ static inline void __list_del(struct list_head * prev, struct list_head * next) WRITE_ONCE(prev->next, next); } +/* + * Delete a list entry and clear the 'prev' pointer. + * + * This is a special-purpose list clearing method used in the networking code + * for lists allocated as per-cpu, where we don't want to incur the extra + * WRITE_ONCE() overhead of a regular list_del_init(). The code that uses this + * needs to check the node 'prev' pointer instead of calling list_empty(). + */ +static inline void __list_del_clearprev(struct list_head *entry) +{ + __list_del(entry->prev, entry->next); + entry->prev = NULL; +} + /** * list_del - deletes entry from list. * @entry: the element to delete from the list. diff --git a/kernel/bpf/xskmap.c b/kernel/bpf/xskmap.c index ef7338cebd18..9bb96ace9fa1 100644 --- a/kernel/bpf/xskmap.c +++ b/kernel/bpf/xskmap.c @@ -145,8 +145,7 @@ void __xsk_map_flush(struct bpf_map *map) list_for_each_entry_safe(xs, tmp, flush_list, flush_node) { xsk_flush(xs); - __list_del(xs->flush_node.prev, xs->flush_node.next); - xs->flush_node.prev = NULL; + __list_del_clearprev(&xs->flush_node); } } -- 2.30.2