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

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Message-ID: <1b6b83f7-c749-6e0a-0001-2febbf01b603@linuxfoundation.org>
Date:   Wed, 8 Jul 2020 08:35:02 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Joe Perches <joe@...ches.com>,
        "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>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH] usbip: Use fallthrough pseudo-keyword

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.

thanks,
-- Shuah