linux-kernel - Re: [PATCH] drm/drm_vm: Mark expected switch fall-throughs

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Date:   Mon, 18 Feb 2019 09:57:01 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] drm/drm_vm: Mark expected switch fall-throughs

On Fri, Feb 15, 2019 at 11:05:46AM -0600, Gustavo A. R. Silva wrote:
> In preparation to enabling -Wimplicit-fallthrough, mark switch
> cases where we are expecting to fall through.
> 
> Warning level 3 was used: -Wimplicit-fallthrough=3
> 
> Notice that, in this particular case, the code comment is modified
> in accordance with what GCC is expecting to find.
> 
> This patch is part of the ongoing efforts to enable
> -Wimplicit-fallthrough.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Queued for 5.2, thanks for your patch.
-Daniel

> ---
>  drivers/gpu/drm/drm_vm.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_vm.c b/drivers/gpu/drm/drm_vm.c
> index c3301046dfaa..8987501f53b2 100644
> --- a/drivers/gpu/drm/drm_vm.c
> +++ b/drivers/gpu/drm/drm_vm.c
> @@ -584,8 +584,8 @@ static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
>  			vma->vm_ops = &drm_vm_ops;
>  			break;
>  		}
> -		/* fall through to _DRM_FRAME_BUFFER... */
>  #endif
> +		/* fall through - to _DRM_FRAME_BUFFER... */
>  	case _DRM_FRAME_BUFFER:
>  	case _DRM_REGISTERS:
>  		offset = drm_core_get_reg_ofs(dev);
> @@ -610,7 +610,7 @@ static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
>  		    vma->vm_end - vma->vm_start, vma->vm_page_prot))
>  			return -EAGAIN;
>  		vma->vm_page_prot = drm_dma_prot(map->type, vma);
> -	/* fall through to _DRM_SHM */
> +		/* fall through - to _DRM_SHM */
>  	case _DRM_SHM:
>  		vma->vm_ops = &drm_vm_shm_ops;
>  		vma->vm_private_data = (void *)map;
> -- 
> 2.20.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch