Quoting Michel Thierry (2018-05-01 15:21:53)
> On 5/1/2018 12:52 AM, Chris Wilson wrote:
> > As our early doorbell is split between early allocation and a late setup
> > after we have a channel to the GuC, it may happen due to a lapse of
> > programmer judgement that we try to setup an invalid doorbell. Make use
> > of our has_doorbell() function to check the doorbell does exist for the
> > client before we try and tell the guc about it. In doing so, we prevent
> > the compiler from warning about the otherwise unused function in some
> > configurations.
> >
>
> Looks ok to me, but the new place has_doorbell is called is inside a
> GEM_BUG_ON...
> So the warning will still be there when CONFIG_DRM_I915_DEBUG_GEM=n, right?
> > @@ -224,6 +223,9 @@ static int create_doorbell(struct intel_guc_client
> > *client)
> > {
> > int ret;
> >
> > + if (WARN_ON(!has_doorbell(client)))
> > + return -ENODEV; /* internal setup error, should never happen
> > */
This is the one I added to make sure we had at least one user. If it
weren't for the compiler warning I'd be happy for this to be
GEM_BUG_ON() as well.
-Chris
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