[RFC PATCH 05/21] list: Comment missing WRITE_ONCE() in __list_del()

[Will Deacon]

Although __list_del() is called from the RCU list implementation, it
omits WRITE_ONCE() when updating the 'prev' pointer for the 'next' node.
This is reasonable because concurrent RCU readers only access the 'next'
pointers.

Although it's obvious after reading the code, add a comment.

Cc: Paul E. McKenney <paulmck@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
---
 include/linux/list.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/list.h b/include/linux/list.h
index 4d9f5f9ed1a8..ec1f780d1449 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -109,6 +109,7 @@ static inline void list_add_tail(struct list_head *new, struct list_head *head)
  */
 static inline void __list_del(struct list_head * prev, struct list_head * next)
 {
+	/* RCU readers don't read the 'prev' pointer */
 	next->prev = prev;
 	WRITE_ONCE(prev->next, next);
 }
-- 
2.20.1