linux-kernel - Re: [PATCH linux-next] drm: drop unneeded assignment in the fx_v6_0_enable

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Date:   Sat, 21 Aug 2021 06:52:48 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     CGEL <cgel.zte@...il.com>, Alex Deucher <alexander.deucher@....com>
Cc:     Pan Xinhui <Xinhui.Pan@....com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Luo penghao <luo.penghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH linux-next] drm: drop unneeded assignment in the
 fx_v6_0_enable_mgcg()

Hi,

Le 21/08/2021 à 04:08, CGEL a écrit :
> From: Luo penghao <luo.penghao@....com.cn>
> 
> The first assignment is not used. In order to keep the code style
> consistency of the whole file, the first 'data' assignment should be
> deleted.
> 
> The clang_analyzer complains as follows:
> 
> drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c:2608:10: warning:
> Although the value storedto 'offset' is used in the enclosing expression,
> the value is never actually read from 'offset'.

Apparently clang only spotted on place, at line 2608.

> 
> Reported-by: Zeal Robot <zealci@....com.cn>
> Signed-off-by: Luo penghao <luo.penghao@....com.cn>
> ---
>   drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c
> index 6a8dade..84a5f22 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c
> @@ -2605,7 +2605,7 @@ static void gfx_v6_0_enable_mgcg(struct amdgpu_device *adev, bool enable)
>   	u32 data, orig, tmp = 0;
>   
>   	if (enable && (adev->cg_flags & AMD_CG_SUPPORT_GFX_MGCG)) {
> -		orig = data = RREG32(mmCGTS_SM_CTRL_REG);
> +		orig = RREG32(mmCGTS_SM_CTRL_REG);
>   		data = 0x96940200;
>   		if (orig != data)
>   			WREG32(mmCGTS_SM_CTRL_REG, data);
> @@ -2617,7 +2617,7 @@ static void gfx_v6_0_enable_mgcg(struct amdgpu_device *adev, bool enable)
>   				WREG32(mmCP_MEM_SLP_CNTL, data);
>   		}
>   
> -		orig = data = RREG32(mmRLC_CGTT_MGCG_OVERRIDE);
> +		orig = RREG32(mmRLC_CGTT_MGCG_OVERRIDE);
>   		data &= 0xffffffc0;
                      ^^
but you also change here where it is used.

>   		if (orig != data)
>   			WREG32(mmRLC_CGTT_MGCG_OVERRIDE, data);
> 

CJ