diff options
| -rw-r--r-- | kernel/futex.c | 43 |
1 files changed, 29 insertions, 14 deletions
diff --git a/kernel/futex.c b/kernel/futex.c index 6b597cf33b02..e76942e2a79f 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -940,6 +940,34 @@ out: return ret; } +/** + * requeue_futex() - Requeue a futex_q from one hb to another + * @q: the futex_q to requeue + * @hb1: the source hash_bucket + * @hb2: the target hash_bucket + * @key2: the new key for the requeued futex_q + */ +static inline +void requeue_futex(struct futex_q *q, struct futex_hash_bucket *hb1, + struct futex_hash_bucket *hb2, union futex_key *key2) +{ + + /* + * If key1 and key2 hash to the same bucket, no need to + * requeue. + */ + if (likely(&hb1->chain != &hb2->chain)) { + plist_del(&q->list, &hb1->chain); + plist_add(&q->list, &hb2->chain); + q->lock_ptr = &hb2->lock; +#ifdef CONFIG_DEBUG_PI_LIST + q->list.plist.lock = &hb2->lock; +#endif + } + get_futex_key_refs(key2); + q->key = *key2; +} + /* * Requeue all waiters hashed on one physical page to another * physical page. @@ -999,20 +1027,7 @@ retry_private: if (++ret <= nr_wake) { wake_futex(this); } else { - /* - * If key1 and key2 hash to the same bucket, no need to - * requeue. - */ - if (likely(head1 != &hb2->chain)) { - plist_del(&this->list, &hb1->chain); - plist_add(&this->list, &hb2->chain); - this->lock_ptr = &hb2->lock; -#ifdef CONFIG_DEBUG_PI_LIST - this->list.plist.lock = &hb2->lock; -#endif - } - this->key = key2; - get_futex_key_refs(&key2); + requeue_futex(this, hb1, hb2, &key2); drop_count++; if (ret - nr_wake >= nr_requeue) |