linux-kernel - Re: [PATCH] virt: vbox: Mark expected switch fall-through

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Message-ID: <0e90b0f5-41a3-1a46-daca-1f3f02b1c903@redhat.com>
Date:   Tue, 26 Feb 2019 22:04:31 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] virt: vbox: Mark expected switch fall-through

Hi,

On 26-02-19 20:23, Gustavo A. R. Silva wrote:
> In preparation to enabling -Wimplicit-fallthrough, mark switch
> cases where we are expecting to fall through.
> 
> This patch fixes the following warning:
> 
> drivers/virt/vboxguest/vboxguest_core.c: In function ‘vbg_core_ioctl’:
> drivers/virt/vboxguest/vboxguest_core.c:1486:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
>     f32bit = true;
>     ~~~~~~~^~~~~~
> drivers/virt/vboxguest/vboxguest_core.c:1489:2: note: here
>    case VBG_IOCTL_HGCM_CALL(0):
>    ^~~~
> 
> 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>

Thank you the patch, patch looks good to me:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans



> ---
>   drivers/virt/vboxguest/vboxguest_core.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/virt/vboxguest/vboxguest_core.c b/drivers/virt/vboxguest/vboxguest_core.c
> index 1475ed5ffcde..df7d09409efe 100644
> --- a/drivers/virt/vboxguest/vboxguest_core.c
> +++ b/drivers/virt/vboxguest/vboxguest_core.c
> @@ -1484,8 +1484,8 @@ int vbg_core_ioctl(struct vbg_session *session, unsigned int req, void *data)
>   #ifdef CONFIG_COMPAT
>   	case VBG_IOCTL_HGCM_CALL_32(0):
>   		f32bit = true;
> -		/* Fall through */
>   #endif
> +		/* Fall through */
>   	case VBG_IOCTL_HGCM_CALL(0):
>   		return vbg_ioctl_hgcm_call(gdev, session, f32bit, data);
>   	case VBG_IOCTL_LOG(0):
>