[Intel-gfx] [PULL] drm-intel-next-fixes

[Jani Nikula]

On Mon, 22 Jun 2015, Ander Conselvan De Oliveira <conselvan2 at gmail.com> wrote:
> There is
>
> commit bd4b4827acdc00bf9e71f939d160102021d10d4f
> Author: Ander Conselvan de Oliveira
> <ander.conselvan.de.oliveira at intel.com>
> Date:   Fri May 29 14:28:09 2015 +0300
>
>     drm/i915: Silence compiler warning
>
> in -nightly to fix that same issue. I didn't realize this was also
> needed in -next-fixes.

Dave, sorry, I didn't see the warning, gcc 4.9.2 here.

Do you want another pull request with Ander's fix on top?

BR,
Jani.


>
>
> Ander
>
> On Fri, 2015-06-19 at 17:24 +0200, Daniel Vetter wrote:
>> On Fri, Jun 19, 2015 at 01:48:13PM +1000, Dave Airlie wrote:
>> > On 18 June 2015 at 16:04, Jani Nikula <jani.nikula at intel.com> wrote:
>> > >
>> > > Hi Dave, i915 fixes for drm-next/v4.2.
>> > >
>> > > BR,
>> > > Jani.
>> > 
>> > And my gcc says:
>> > 
>> > /home/airlied/devel/kernel/drm-next/drivers/gpu/drm/i915/intel_display.c:
>> > In function ‘__intel_set_mode’:
>> > /home/airlied/devel/kernel/drm-next/drivers/gpu/drm/i915/intel_display.c:11850:14:
>> > warning: ‘crtc_state’ may be used uninitialized in this function
>> > [-Wmaybe-uninitialized]
>> >   return state->mode_changed || state->active_changed;
>> >               ^
>> > /home/airlied/devel/kernel/drm-next/drivers/gpu/drm/i915/intel_display.c:11860:25:
>> > note: ‘crtc_state’ was declared here
>> >   struct drm_crtc_state *crtc_state;
>> >                          ^
>> > /home/airlied/devel/kernel/drm-next/drivers/gpu/drm/i915/intel_display.c:11874:6:
>> > warning: ‘crtc’ may be used uninitialized in this function
>> > [-Wmaybe-uninitialized]
>> >    if (crtc != intel_encoder->base.crtc)
>> >       ^
>> > /home/airlied/devel/kernel/drm-next/drivers/gpu/drm/i915/intel_display.c:11859:19:
>> > note: ‘crtc’ was declared here
>> >   struct drm_crtc *crtc;
>> >                    ^
>> > 
>> > No idea if this is true, but I don't think I've seen it before now.
>> > 
>> > gcc 5.1.1 on fedora 22
>> 
>> Yeah this is new with Ander's patches. gcc Doesn't know that we have at
>> least 1 crtc and hence crtc&crtc are guaranteed to be initiliazed. I
>> think you should be able to shut it up with
>> 
>> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
>> index e047105837c9..5ade250dc6d7 100644
>> --- a/drivers/gpu/drm/i915/intel_display.c
>> +++ b/drivers/gpu/drm/i915/intel_display.c
>> @@ -11856,8 +11856,8 @@ intel_modeset_update_state(struct drm_atomic_state *state)
>>  	struct drm_device *dev = state->dev;
>>  	struct drm_i915_private *dev_priv = dev->dev_private;
>>  	struct intel_encoder *intel_encoder;
>> -	struct drm_crtc *crtc;
>> -	struct drm_crtc_state *crtc_state;
>> +	struct drm_crtc *crtc = NULL;
>> +	struct drm_crtc_state *crtc_state = NULL;
>>  	struct drm_connector *connector;
>>  	int i;
>>  
>> But the entire Finland team is out of office (celebrating solstice), so
>> might be better to wait for Monday for them to confirm. Otherwise just
>> apply this fixup with my ack if you want to send out the merge window pull
>> asap.
>> 
>> Cheers, Daniel
>
>

-- 
Jani Nikula, Intel Open Source Technology Center