Commit-ID: d40d65c8dbdd39f0b64e043f6bd08f8a38f55194
Gitweb: http://git.kernel.org/tip/d40d65c8dbdd39f0b64e043f6bd08f8a38f55194
Author: Darren Hart <dvhltc@xxxxxxxxxx>
AuthorDate: Mon, 21 Sep 2009 22:30:15 -0700
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Tue, 22 Sep 2009 10:37:43 +0200
futex: Correct queue_me and unqueue_me commentary
The queue_me/unqueue_me commentary is oddly placed and out of date.
Clean it up and correct the inaccurate bits.
Signed-off-by: Darren Hart <dvhltc@xxxxxxxxxx>
Acked-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Cc: Dinakar Guniguntala <dino@xxxxxxxxxx>
Cc: John Stultz <johnstul@xxxxxxxxxx>
LKML-Reference: <20090922053015.8717.71713.stgit@Aeon>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
kernel/futex.c | 41 +++++++++++++++++++++++++++++------------
1 files changed, 29 insertions(+), 12 deletions(-)
diff --git a/kernel/futex.c b/kernel/futex.c
index 6c498b1..cedcd60 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -1350,6 +1350,25 @@ static inline struct futex_hash_bucket *queue_lock(struct futex_q *q)
return hb;
}
+static inline void
+queue_unlock(struct futex_q *q, struct futex_hash_bucket *hb)
+{
+ spin_unlock(&hb->lock);
+ drop_futex_key_refs(&q->key);
+}
+
+/**
+ * queue_me() - Enqueue the futex_q on the futex_hash_bucket
+ * @q: The futex_q to enqueue
+ * @hb: The destination hash bucket
+ *
+ * The hb->lock must be held by the caller, and is released here. A call to
+ * queue_me() is typically paired with exactly one call to unqueue_me(). The
+ * exceptions involve the PI related operations, which may use unqueue_me_pi()
+ * or nothing if the unqueue is done as part of the wake process and the unqueue
+ * state is implicit in the state of woken task (see futex_wait_requeue_pi() for
+ * an example).
+ */
static inline void queue_me(struct futex_q *q, struct futex_hash_bucket *hb)
{
int prio;
@@ -1373,19 +1392,17 @@ static inline void queue_me(struct futex_q *q, struct futex_hash_bucket *hb)
spin_unlock(&hb->lock);
}
-static inline void
-queue_unlock(struct futex_q *q, struct futex_hash_bucket *hb)
-{
- spin_unlock(&hb->lock);
- drop_futex_key_refs(&q->key);
-}
-
-/*
- * queue_me and unqueue_me must be called as a pair, each
- * exactly once. They are called with the hashed spinlock held.
+/**
+ * unqueue_me() - Remove the futex_q from its futex_hash_bucket
+ * @q: The futex_q to unqueue
+ *
+ * The q->lock_ptr must not be held by the caller. A call to unqueue_me() must
+ * be paired with exactly one earlier call to queue_me().
+ *
+ * Returns:
+ * 1 - if the futex_q was still queued (and we removed unqueued it)
+ * 0 - if the futex_q was already removed by the waking thread
*/
-
-/* Return 1 if we were still queued (ie. 0 means we were woken) */
static int unqueue_me(struct futex_q *q)
{
spinlock_t *lock_ptr;
--
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