linux-kernel - Re: drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c:843:6: error: variable 'out' set but not used

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Date: Tue, 26 Mar 2024 21:47:30 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>, Rob Clark <robdclark@...il.com>, 
	Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
	linux-arm-msm <linux-arm-msm@...r.kernel.org>, dri-devel <dri-devel@...ts.freedesktop.org>, 
	freedreno@...ts.freedesktop.org, linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c:843:6: error:
 variable 'out' set but not used

On Tue, 26 Mar 2024 at 21:32, Abhinav Kumar <quic_abhinavk@...cinc.com> wrote:
>
>
>
> On 3/26/2024 12:10 PM, Dmitry Baryshkov wrote:
> > On Tue, 26 Mar 2024 at 20:31, Abhinav Kumar <quic_abhinavk@...cinc.com> wrote:
> >>
> >>
> >>
> >> On 3/26/2024 11:19 AM, Dmitry Baryshkov wrote:
> >>> On Tue, 26 Mar 2024 at 20:05, Miguel Ojeda
> >>> <miguel.ojeda.sandonis@...il.com> wrote:
> >>>>
> >>>> Hi,
> >>>>
> >>>> In today's next, I got:
> >>>>
> >>>>       drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c:843:6: error: variable
> >>>> 'out' set but not used [-Werror,-Wunused-but-set-variable]
> >>>>
> >>>> `out` seems to be there since commit 64d6255650d4 ("drm/msm: More
> >>>> fully implement devcoredump for a7xx").
> >>>>
> >>>> Untested diff below assuming `dumper->iova` is constant -- if you want
> >>>> a formal patch, please let me know.
> >>>
> >>> Please send a proper patch that we can pick up.
> >>>
> >>
> >> This should be fixed with https://patchwork.freedesktop.org/patch/581853/.
> >
> > Is that a correct fix? If you check other usage locations for
> > CRASHDUMP_READ, you'll see that `out` is the last parameter and it is
> > being incremented.
> >
>
> Right but in this function out is not the last parameter of CRASHDUMP_READ.

Yes. I think in this case the patch from this email is more correct.

>
> Maybe you or Rob can correct me but I thought the fix looked sane
> although noone commented on that patch.

>
> >>
> >> We can pickup that one with a Fixes tag applied.
> >>
> >>>>
> >>>> Cheers,
> >>>> Miguel
> >>>>
> >>>> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
> >>>> b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
> >>>> index 1f5245fc2cdc..a847a0f7a73c 100644
> >>>> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
> >>>> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
> >>>> @@ -852,7 +852,7 @@ static void a6xx_get_shader_block(struct msm_gpu *gpu,
> >>>>                (block->type << 8) | i);
> >>>>
> >>>>            in += CRASHDUMP_READ(in, REG_A6XX_HLSQ_DBG_AHB_READ_APERTURE,
> >>>> -            block->size, dumper->iova + A6XX_CD_DATA_OFFSET);
> >>>> +            block->size, out);
> >>>>
> >>>>            out += block->size * sizeof(u32);
> >>>>        }
> >>>
> >>>
> >>>
> >
> >
> >



-- 
With best wishes
Dmitry