linux-kernel - Re: [PATCH] usbip: Use fallthrough pseudo-keyword

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Message-ID: <dd532813cc28b6f27b2d0ed6bd3529f2@perches.com>
Date:   Wed, 08 Jul 2020 08:39:59 -0700
From:   Joe Perches <joe@...ches.com>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Valentina Manea <valentina.manea.m@...il.com>,
        Shuah Khan <shuah@...nel.org>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH] usbip: Use fallthrough pseudo-keyword

On 2020-07-08 07:35, Shuah Khan wrote:
> On 7/7/20 7:56 PM, Joe Perches wrote:
>> On Tue, 2020-07-07 at 14:06 -0600, Shuah Khan wrote:
>>> On 7/7/20 1:52 PM, Gustavo A. R. Silva wrote:
>>>> Replace the existing /* fall through */ comments and its variants 
>>>> with
>>>> the new pseudo-keyword macro fallthrough[1]. Also, remove 
>>>> unnecessary
>>>> fall-through markings when it is the case.
>>>> 
>>>> [1] 
>>>> https://www.kernel.org/doc/html/latest/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through
>>>> 
>>> 
>>> Is fallthrough syntax supported on our min gcc version?
>> 
>> No.  Introduced in gcc 7.
>> 
> 
> Gustavo,
> 
> In which case, this patch would break usbip build on older gcc
> revisions.

No it will not.  Comment fall through was introduced in gcc 7 and this 
devolved into a do while 0
> thanks,
> -- Shuah