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

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On 3/26/2024 12:10 PM, Dmitry Baryshkov wrote:
On Tue, 26 Mar 2024 at 20:31, Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx> wrote:



On 3/26/2024 11:19 AM, Dmitry Baryshkov wrote:
On Tue, 26 Mar 2024 at 20:05, Miguel Ojeda
<miguel.ojeda.sandonis@xxxxxxxxx> 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.

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);
       }










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