linux-kernel - Re: [PATCH 1/3] drm: msm: a6xx: Mark expected switch fall-through

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Date:   Thu, 1 Aug 2019 10:24:10 -0400
From:   Sean Paul <sean@...rly.run>
To:     Anders Roxell <anders.roxell@...aro.org>
Cc:     robdclark@...il.com, sean@...rly.run, airlied@...ux.ie,
        daniel@...ll.ch, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] drm: msm: a6xx: Mark expected switch fall-through

On Fri, Jul 26, 2019 at 01:27:46PM +0200, Anders Roxell wrote:
> When fall-through warnings was enabled by default the following warning
> was starting to show up:
> 
> ../drivers/gpu/drm/msm/adreno/a6xx_gpu.c: In function ‘a6xx_submit’:
> ../drivers/gpu/drm/msm/adreno/a6xx_gpu.c:116:7: warning: this statement may fall
>  through [-Wimplicit-fallthrough=]
>     if (priv->lastctx == ctx)
>        ^
> ../drivers/gpu/drm/msm/adreno/a6xx_gpu.c:118:3: note: here
>    case MSM_SUBMIT_CMD_BUF:
>    ^~~~
> 
> Rework so that the compiler doesn't warn about fall-through.
> 
> Fixes: d93512ef0f0e ("Makefile: Globally enable fall-through warning")
> Signed-off-by: Anders Roxell <anders.roxell@...aro.org>

Hi Anders,
Thank you for your patches. Jordan had previously sent the same fixes in
"drm/msm: Annotate intentional switch statement fall throughs" one day earlier
than yours, so I'll pick up that patch.

Thanks again!

Sean

> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index be39cf01e51e..644a6ee53f05 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -115,6 +115,7 @@ static void a6xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
>  		case MSM_SUBMIT_CMD_CTX_RESTORE_BUF:
>  			if (priv->lastctx == ctx)
>  				break;
> +			/* Fall through */
>  		case MSM_SUBMIT_CMD_BUF:
>  			OUT_PKT7(ring, CP_INDIRECT_BUFFER_PFE, 3);
>  			OUT_RING(ring, lower_32_bits(submit->cmd[i].iova));
> -- 
> 2.20.1
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS