Re: [PATCH] drm/i915: Disable unused-but-set compiler warning

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Quoting Maarten Lankhorst (2018-02-08 16:50:08)
> Op 08-02-18 om 17:16 schreef Chris Wilson:
> > The unused-but-set warning enabled by W=1 catches out a lot of the
> > atomic helper iterator macros and drown us in their noise (or trip over
> > Werror and die). Path of least resistance is to ignore the warning.
> >
> > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> > Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
> > Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> > ---
> >  drivers/gpu/drm/i915/Makefile | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> > index 3bddd8a06806..f55cc028b2eb 100644
> > --- a/drivers/gpu/drm/i915/Makefile
> > +++ b/drivers/gpu/drm/i915/Makefile
> > @@ -17,6 +17,7 @@ subdir-ccflags-y += $(call cc-disable-warning, unused-parameter)
> >  subdir-ccflags-y += $(call cc-disable-warning, type-limits)
> >  subdir-ccflags-y += $(call cc-disable-warning, missing-field-initializers)
> >  subdir-ccflags-y += $(call cc-disable-warning, implicit-fallthrough)
> > +subdir-ccflags-y += $(call cc-disable-warning, unused-but-set-variable)
> >  subdir-ccflags-$(CONFIG_DRM_I915_WERROR) += -Werror
> >  
> >  # Fine grained warnings disable
> 
> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>

And pushed with Joonas's r-b as well which didn't quite make the list.

All but for an unused icelake device_info, we compile cleanly with W=1
on gcc-8. Lots more kerneldoc to cleanup though.
-Chris
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