linux-kernel - [PATCH 5/8] futex: add wake_data to struct futex

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Message-Id: <20230928172517.961093-6-axboe@kernel.dk>
Date:   Thu, 28 Sep 2023 11:25:14 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     io-uring@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     peterz@...radead.org, andres@...razel.de, tglx@...utronix.de,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 5/8] futex: add wake_data to struct futex_q

With handling multiple futex_q for waitv, we cannot easily go from the
futex_q to data related to that request or queue. Add a wake_data
argument that belongs to the wake handler assigned.

Signed-off-by: Jens Axboe <axboe@...nel.dk>
---
 kernel/futex/futex.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/futex/futex.h b/kernel/futex/futex.h
index 33835b81e0c3..76f6c2e0f539 100644
--- a/kernel/futex/futex.h
+++ b/kernel/futex/futex.h
@@ -148,6 +148,7 @@ typedef void (futex_wake_fn)(struct wake_q_head *wake_q, struct futex_q *q);
  * @task:		the task waiting on the futex
  * @lock_ptr:		the hash bucket lock
  * @wake:		the wake handler for this queue
+ * @wake_data:		data associated with the wake handler
  * @key:		the key the futex is hashed on
  * @pi_state:		optional priority inheritance state
  * @rt_waiter:		rt_waiter storage for use with requeue_pi
@@ -173,6 +174,7 @@ struct futex_q {
 	struct task_struct *task;
 	spinlock_t *lock_ptr;
 	futex_wake_fn *wake;
+	void *wake_data;
 	union futex_key key;
 	struct futex_pi_state *pi_state;
 	struct rt_mutex_waiter *rt_waiter;
-- 
2.40.1