linux-kernel - Re: [PATCH] xen, fbfront: mark expected switch fall-through

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Message-ID: <ca45f983-9a42-6326-3c9a-5e239ddc4e46@samsung.com>
Date:   Thu, 21 Mar 2019 12:03:09 +0100
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Oleksandr Andrushchenko <andr2000@...il.com>,
        Kees Cook <keescook@...omium.org>, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        xen-devel <xen-devel@...ts.xenproject.org>
Subject: Re: [PATCH] xen, fbfront: mark expected switch fall-through


Hi,

On 03/20/2019 09:08 PM, Gustavo A. R. Silva wrote:
> Hi all,
> 
> Friendly ping:
> 
> Who can take this?

I'll take this for v5.2.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

> Thanks
> --
> Gustavo
> 
> On 2/28/19 5:51 AM, Oleksandr Andrushchenko wrote:
>> +Xen-devel list
>>
>> On 2/27/19 10:53 PM, 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/video/fbdev/xen-fbfront.c: In function ‘xenfb_backend_changed’:
>>> drivers/video/fbdev/xen-fbfront.c:678:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
>>>     if (dev->state == XenbusStateClosed)
>>>        ^
>>> drivers/video/fbdev/xen-fbfront.c:681:2: note: here
>>>    case XenbusStateClosing:
>>>    ^~~~
>>>
>>> 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>
>>> ---
>>>   drivers/video/fbdev/xen-fbfront.c | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/video/fbdev/xen-fbfront.c b/drivers/video/fbdev/xen-fbfront.c
>>> index 6a4bbc9e1fb0..a3d6b6db221b 100644
>>> --- a/drivers/video/fbdev/xen-fbfront.c
>>> +++ b/drivers/video/fbdev/xen-fbfront.c
>>> @@ -677,7 +677,7 @@ static void xenfb_backend_changed(struct xenbus_device *dev,
>>>       case XenbusStateClosed:
>>>           if (dev->state == XenbusStateClosed)
>>>               break;
>>> -        /* Missed the backend's CLOSING state -- fallthrough */
>>> +        /* fall through - Missed the backend's CLOSING state. */
>>>       case XenbusStateClosing:
>>>           xenbus_frontend_closed(dev);
>>>           break;