add xenomai

hc

2024-11-01 2f529f9b558ca1c1bd74be7437a84e4711743404

 kernel/kernel/time/tick-common.c
..
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@@ -248,7 +248,8 @@
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 	} else {
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 		handler = td->evtdev->event_handler;
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 		next_event = td->evtdev->next_event;
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-		td->evtdev->event_handler = clockevents_handle_noop;
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+		if (!clockevent_state_reserved(td->evtdev))
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+			td->evtdev->event_handler = clockevents_handle_noop;
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 	}
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 	td->evtdev = newdev;
..
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@@ -330,6 +331,12 @@
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 bool tick_check_replacement(struct clock_event_device *curdev,
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 			    struct clock_event_device *newdev)
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 {
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+	/*
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+	 * Never replace an active proxy except when unregistering it.
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+	 */
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+	if (tick_check_is_proxy(curdev))
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+		return false;
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+
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 	if (!tick_check_percpu(curdev, newdev, smp_processor_id()))
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 		return false;
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@@ -350,6 +357,9 @@
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 	td = &per_cpu(tick_cpu_device, cpu);
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 	curdev = td->evtdev;
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+	if (tick_check_is_proxy(curdev))
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+		goto out_bc;
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+
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 	/* cpu local device ? */
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 	if (!tick_check_percpu(curdev, newdev, cpu))
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 		goto out_bc;
..
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@@ -367,7 +377,12 @@
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 	 * not give it back to the clockevents layer !
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 	 */
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 	if (tick_is_broadcast_device(curdev)) {
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-		clockevents_shutdown(curdev);
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+		if (tick_check_is_proxy(newdev)) {
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+			list_del(&curdev->list);
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+			clockevents_switch_state(curdev, CLOCK_EVT_STATE_RESERVED);
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+		} else {
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+			clockevents_shutdown(curdev);
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+		}
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 		curdev = NULL;
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 	}
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 	clockevents_exchange_device(curdev, newdev);