Commit-ID: 74b912de4f92fe84864b1255ec22e6f8fa14ead4
Gitweb: http://git.kernel.org/tip/74b912de4f92fe84864b1255ec22e6f8fa14ead4
Author: Darren Hart <dvhltc@xxxxxxxxxx>
AuthorDate: Fri, 3 Apr 2009 13:40:31 -0700
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Sun, 5 Apr 2009 20:59:27 +0200
futex: distangle futex_requeue()
futex_requeue() is getting a bit long-winded, and will be getting more
so after the requeue_pi patch. Factor out the actual requeueing into a
nicely contained inline function to reduce function length and improve
legibility.
Signed-off-by: Darren Hart <dvhltc@xxxxxxxxxx>
Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
kernel/futex.c | 43 +++++++++++++++++++++++++++++--------------
1 files changed, 29 insertions(+), 14 deletions(-)
diff --git a/kernel/futex.c b/kernel/futex.c
index 04e5431..4fa5de1 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)
--
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