Received-SPF: pass (google.com: domain of linux-wireless-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Jes Sorensen <jes.sorensen@gmail.com>
Subject: Re: [PATCH RESEND][next] rtl8xxxu: Fix fall-through warnings for
 Clang
To:     Kees Cook <keescook@chromium.org>,
        Kalle Valo <kvalo@codeaurora.org>
Cc:     "Gustavo A. R. Silva" <gustavoars@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org
References: <20210305094850.GA141221@embeddedor>
 <871rct67n2.fsf@codeaurora.org> <202103101107.BE8B6AF2@keescook>
Message-ID: <2e425bd8-2722-b8a8-3745-4a3f77771906@gmail.com>
Date:   Wed, 10 Mar 2021 14:31:57 -0500
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101
 Thunderbird/78.6.0
MIME-Version: 1.0
In-Reply-To: <202103101107.BE8B6AF2@keescook>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Precedence: bulk

On 3/10/21 2:14 PM, Kees Cook wrote:
> On Fri, Mar 05, 2021 at 03:40:33PM +0200, Kalle Valo wrote:
>> "Gustavo A. R. Silva" <gustavoars@kernel.org> writes:
>>
>>> In preparation to enable -Wimplicit-fallthrough for Clang, fix
>>> multiple warnings by replacing /* fall through */ comments with
>>> the new pseudo-keyword macro fallthrough; instead of letting the
>>> code fall through to the next case.
>>>
>>> Notice that Clang doesn't recognize /* fall through */ comments as
>>> implicit fall-through markings.
>>>
>>> Link: https://github.com/KSPP/linux/issues/115
>>> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
>>
>> It's not cool that you ignore the comments you got in [1], then after a
>> while mark the patch as "RESEND" and not even include a changelog why it
>> was resent.
>>
>> [1] https://patchwork.kernel.org/project/linux-wireless/patch/d522f387b2d0dde774785c7169c1f25aa529989d.1605896060.git.gustavoars@kernel.org/
> 
> Hm, this conversation looks like a miscommunication, mainly? I see
> Gustavo, as requested by many others[1], replacing the fallthrough
> comments with the "fallthrough" statement. (This is more than just a
> "Clang doesn't parse comments" issue.)
> 
> This could be a tree-wide patch and not bother you, but Greg KH has
> generally advised us to send these changes broken out. Anyway, this
> change still needs to land, so what would be the preferred path? I think
> Gustavo could just carry it for Linus to merge without bothering you if
> that'd be preferred?

I'll respond with the same I did last time, fallthrough is not C and
it's ugly.

Instead of mutilating the kernel, Gustavo should invest in fixing the
broken clang compiler.

Thanks,
Jes