Re: [Qemu-devel] [PATCH 3/4] qdev: Don't compile hotplug code in user-mode emulation

[Eduardo Habkost <ehabkost@redhat.com>]

On Fri, Apr 26, 2019 at 10:27:58AM +0200, Paolo Bonzini wrote:
> On 25/04/19 22:00, Eduardo Habkost wrote:
> > diff --git a/hw/core/qdev-hotplug-stubs.c b/hw/core/qdev-hotplug-stubs.c
> > new file mode 100644
> > index 0000000000..c710f23388
> > --- /dev/null
> > +++ b/hw/core/qdev-hotplug-stubs.c
> > @@ -0,0 +1,44 @@
> > +/*
> > + * qdev hotplug handler stubs (for user-mode emulation and unit tests)
> 
> Can you explain the issue with unit tests in the commit message?

I don't think there are issues with unit tests.  I just thought
it was pointless to link qdev-hotplug.o into unit tests binaries
if no hotplug handler object is created by them.

What do you think?  Should I keep qdev-hotplug.o and hotplug.o in
the unit tests binaries?

> 
> > + *  Copyright (c) 2019 Red Hat Inc
> > + *
> > + * Authors:
> > + *  Eduardo Habkost <ehabkost@redhat.com>
> > + *
> > + * This library is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU Lesser General Public
> > + * License as published by the Free Software Foundation; either
> > + * version 2 of the License, or (at your option) any later version.
> > + *
> > + * This library is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> > + * Lesser General Public License for more details.
> > + *
> > + * You should have received a copy of the GNU Lesser General Public
> > + * License along with this library; if not, see <http://www.gnu.org/licenses/>.
> > + */
> > +
> > +#include "qemu/osdep.h"
> > +#include "hw/qdev-core.h"
> > +#include "hw/hotplug.h"
> > +
> > +HotplugHandler *qdev_get_hotplug_handler(DeviceState *dev)
> > +{
> > +    return NULL;
> > +}
> > +
> > +void hotplug_handler_pre_plug(HotplugHandler *plug_handler,
> > +                              DeviceState *plugged_dev,
> > +                              Error **errp)
> > +{
> > +    assert(plug_handler == NULL);
> > +}
> > +
> > +void hotplug_handler_plug(HotplugHandler *plug_handler,
> > +                          DeviceState *plugged_dev,
> > +                          Error **errp)
> > +{
> > +    assert(plug_handler == NULL);
> > +}
> 
> Would it work if you instead make these functions (and the others in
> hw/core/hotplug.c) inlines in include/hw/hotplug.h?
> 
> Then all that remains is qdev_get_hotplug_handler.

I think that would work.  I'll do that in v2, thanks!

-- 
Eduardo