Quoting Imre Deak (2020-12-01 10:52:22)
> On Tue, Dec 01, 2020 at 08:14:40AM +0000, Chris Wilson wrote:
> > Quoting Imre Deak (2020-11-30 22:47:08)
> > > On Mon, Nov 30, 2020 at 10:07:01PM +0000, Chris Wilson wrote:
> > > > Quoting Imre Deak (2020-11-30 21:22:00)
> > > > > All the display power domain references are wakeref tracked now, so we
> > > > > can mark intel_display_power_put_unchecked() as an internal function
> > > > > (for suppressing wakeref tracking in non-debug builds).
> > > > >
> > > > > Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> > > > > Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
> > > >
> > > > Ok, after all previous patches it will only be called from the header
> > > > after throwing away the wakeref.
> > > >
> > > > I have a sneaky suspicion you might take another path after reviewing
> > > > the danger caused by the debug build,
> > >
> > > Yes, how about also adding:
> > >
> > > +static inline void
> > > +____intel_display_power_put(struct drm_i915_private *i915,
> > > + enum intel_display_power_domain domain,
> > > + intel_wakeref_t wakeref)
> > > +{
> > > + intel_display_power_put_unchecked(i915, domain);
> > > +}
> > > +
> > > static inline void
> > > intel_display_power_put(struct drm_i915_private *i915,
> > > enum intel_display_power_domain domain,
> > > intel_wakeref_t wakeref)
> > > {
> > > - intel_display_power_put_unchecked(i915, domain);
> > > + ____intel_display_power_put(i915, domain, wakeref);
> > > }
> > >
> > > (and similar change for intel_display_power_put_async()) ?
> >
> > Hmm. The compiler shouldn't DCE the wakeref since it has a side-effect.
> > We can but see.
>
> Yes, arguments passed to functions are evaluated exactly once. The above
> extra call doesn't make sense anyway.
>
> Are you ok with patch 4 then?
If you've done a quick non-debug test run, then I'm convinced I was
barking up the wrong tree.
The remaining patches are
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
(since they were all blocked by the uncertainty in behaviour of the
fetch_and_zero).
-Chris
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