linux-kernel - Re: [PATCH] drm/msm/dpu: Fix bit-shifting UB in DPU_HW

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Message-Id: <168004255463.1060915.9592020077874857953.b4-ty@linaro.org>
Date:   Wed, 29 Mar 2023 01:37:50 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Vinod Koul <vkoul@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm/dpu: Fix bit-shifting UB in DPU_HW_VER() macro


On Mon, 06 Mar 2023 10:06:33 +0100, Geert Uytterhoeven wrote:
> With gcc-5 and CONFIG_UBSAN_SHIFT=y:
> 
>     drivers/gpu/drm/msm/msm_mdss.c: In function 'msm_mdss_enable':
>     drivers/gpu/drm/msm/msm_mdss.c:296:2: error: case label does not reduce to an integer constant
>       case DPU_HW_VER_800:
>       ^
>     drivers/gpu/drm/msm/msm_mdss.c:299:2: error: case label does not reduce to an integer constant
>       case DPU_HW_VER_810:
>       ^
>     drivers/gpu/drm/msm/msm_mdss.c:300:2: error: case label does not reduce to an integer constant
>       case DPU_HW_VER_900:
>       ^
> 
> [...]

Applied, thanks!

[1/1] drm/msm/dpu: Fix bit-shifting UB in DPU_HW_VER() macro
      https://gitlab.freedesktop.org/lumag/msm/-/commit/c8f370bde5b9

Best regards,
-- 
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>