From 2f073848c3cc8aff2655ab7c46d8c0de90cf4e50 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Mon, 12 Oct 2015 16:56:42 -0700 Subject: [PATCH] list: Use WRITE_ONCE() when initializing list_head structures Code that does lockless emptiness testing of non-RCU lists is relying on INIT_LIST_HEAD() to write the list head's ->next pointer atomically, particularly when INIT_LIST_HEAD() is invoked from list_del_init(). This commit therefore adds WRITE_ONCE() to this function's pointer stores that could affect the head's ->next pointer. Reported-by: Andrey Konovalov Signed-off-by: Paul E. McKenney --- include/linux/list.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/list.h b/include/linux/list.h index 06c2d887a918..5356f4d661a7 100644 --- a/include/linux/list.h +++ b/include/linux/list.h @@ -24,7 +24,7 @@ static inline void INIT_LIST_HEAD(struct list_head *list) { - list->next = list; + WRITE_ONCE(list->next, list); list->prev = list; }