Re: [Qemu-devel] [PATCH v12 1/2] hw/ppc/spapr_events.c: removing 'exception' from sPAPREventLogEntry

[David Gibson <david@gibson.dropbear.id.au>]

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On Fri, May 19, 2017 at 11:27:49AM -0300, Daniel Henrique Barboza wrote:
> Currenty we do not have any RTAS event that is reported by the
> event-scan interface. The existing events, RTAS_LOG_TYPE_EPOW and
> RTAS_LOG_TYPE_HOTPLUG, are being reported by the check-exception
> interface and, as such, marked as 'exception=true'.
> 
> Commit 79853e18d9, 'spapr_events: event-scan RTAS interface', added
> the event_scan interface because the guest kernel requires it to
> initialize other required interfaces. It is acting since then as
> a stub because no events that would be reported by it were added
> since then. However, the existence of the 'exception' boolean adds
> an unnecessary load in the future migration of the pending_events,
> sPAPREventLogEntry QTAILQ that hosts the pending RTAS events.
> 
> To make the code cleaner and ease the future migration changes, this
> patch makes the following changes:
> 
> - remove the 'exception' boolean that filter these events. There is
> nothing to filter since all events are reported by check-exception;
> 
> - functions rtas_event_log_queue, rtas_event_log_dequeue and
> rtas_event_log_contains don't receive the 'exception' boolean
> as parameter;
> 
> - event_scan function was simplified. It was calling
> 'rtas_event_log_dequeue(mask, false)' that was always returning
> 'NULL' because we have no events that are created with
> exception=false, thus in the end it would execute a jump to
> 'out_no_events' all the time. The function now assumes that
> this will always be the case and all the remaining logic were
> deleted.
> 
> In the future, when or if we add new RTAS events that should
> be reported with the event_scan interface, we can refer to
> the changes made in this patch to add the event_scan logic
> back.
> 
> Signed-off-by: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com>

Applied to ppc-for-2.10.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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