add new system file

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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/net/bluetooth/cmtp/core.c
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@@ -288,9 +288,6 @@
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 	add_wait_queue(sk_sleep(sk), &wait);
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 	while (1) {
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-		/* Ensure session->terminate is updated */
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-		smp_mb__before_atomic();
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-
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 		if (atomic_read(&session->terminate))
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 			break;
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 		if (sk->sk_state != BT_CONNECTED)
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@@ -306,6 +303,10 @@
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 		cmtp_process_transmit(session);
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+		/*
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+		 * wait_woken() performs the necessary memory barriers
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+		 * for us; see the header comment for this primitive.
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+		 */
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 		wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
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 	}
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 	remove_wait_queue(sk_sleep(sk), &wait);
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@@ -436,9 +437,10 @@
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 		/* Stop session thread */
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 		atomic_inc(&session->terminate);
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-		/* Ensure session->terminate is updated */
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-		smp_mb__after_atomic();
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-
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+		/*
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+		 * See the comment preceding the call to wait_woken()
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+		 * in cmtp_session().
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+		 */
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 		wake_up_interruptible(sk_sleep(session->sock->sk));
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 	} else
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 		err = -ENOENT;