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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Message-ID: <CAA8EJppqrF10J1qExM=gopiF4GPDt7v4TB6LrQxx5OGyAL9hSg@mail.gmail.com>
Date: Tue, 26 Mar 2024 21:10:45 +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 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.

>
> 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