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

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Message-Id: <20230712162017.391843-6-axboe@kernel.dk>
Date:   Wed, 12 Jul 2023 10:20:14 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     io-uring@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, peterz@...radead.org,
        andres@...razel.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 | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/futex/futex.h b/kernel/futex/futex.h
index 1d531244fb71..24180a95bdc8 100644
--- a/kernel/futex/futex.h
+++ b/kernel/futex/futex.h
@@ -102,6 +102,7 @@ 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