diff options
Diffstat (limited to 'kernel/rcu/rcu_segcblist.c')
| -rw-r--r-- | kernel/rcu/rcu_segcblist.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/kernel/rcu/rcu_segcblist.c b/kernel/rcu/rcu_segcblist.c index ff431cc83037..495c58ce1640 100644 --- a/kernel/rcu/rcu_segcblist.c +++ b/kernel/rcu/rcu_segcblist.c @@ -37,6 +37,36 @@ void rcu_cblist_enqueue(struct rcu_cblist *rclp, struct rcu_head *rhp) } /* + * Flush the second rcu_cblist structure onto the first one, obliterating + * any contents of the first. If rhp is non-NULL, enqueue it as the sole + * element of the second rcu_cblist structure, but ensuring that the second + * rcu_cblist structure, if initially non-empty, always appears non-empty + * throughout the process. If rdp is NULL, the second rcu_cblist structure + * is instead initialized to empty. + */ +void rcu_cblist_flush_enqueue(struct rcu_cblist *drclp, + struct rcu_cblist *srclp, + struct rcu_head *rhp) +{ + drclp->head = srclp->head; + if (drclp->head) + drclp->tail = srclp->tail; + else + drclp->tail = &drclp->head; + drclp->len = srclp->len; + drclp->len_lazy = srclp->len_lazy; + if (!rhp) { + rcu_cblist_init(srclp); + } else { + rhp->next = NULL; + srclp->head = rhp; + srclp->tail = &rhp->next; + WRITE_ONCE(srclp->len, 1); + srclp->len_lazy = 0; + } +} + +/* * Dequeue the oldest rcu_head structure from the specified callback * list. This function assumes that the callback is non-lazy, but * the caller can later invoke rcu_cblist_dequeued_lazy() if it |