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Subject: Re: [PATCH 1/2] Compiler Attributes: add support for __fallthrough
 (gcc >= 7.1)
To:     "Theodore Y. Ts'o" <tytso@mit.edu>,
        Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org,
        Dan Carpenter <dan.carpenter@oracle.com>,
        Andreas Dilger <adilger.kernel@dilger.ca>,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        Michal Marek <michal.lkml@markovi.net>,
        Steven Rostedt <rostedt@goodmis.org>,
        Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
        Olof Johansson <olof@lxom.net>,
        Konstantin Ryabitsev <konstantin@linuxfoundation.org>,
        "David S . Miller" <davem@davemloft.net>,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Kees Cook <keescook@chromium.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@kernel.org>,
        Paul Lawrence <paullawrence@google.com>,
        Sandipan Das <sandipan@linux.vnet.ibm.com>,
        Andrey Konovalov <andreyknvl@google.com>,
        David Woodhouse <dwmw2@infradead.org>,
        Will Deacon <will.deacon@arm.com>,
        Philippe Ombredanne <pombredanne@nexb.com>,
        Paul Burton <paul.burton@mips.com>,
        David Rientjes <rientjes@google.com>, Willy Tarreau <w@1wt.eu>,
        Martin Sebor <msebor@gmail.com>,
        Christopher Li <sparse@chrisli.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Rasmus Villemoes <linux@rasmusvillemoes.dk>,
        Joe Perches <joe@perches.com>, Arnd Bergmann <arnd@arndb.de>,
        Dominique Martinet <asmadeus@codewreck.org>,
        Stefan Agner <stefan@agner.ch>,
        Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-doc@vger.kernel.org, linux-ext4@vger.kernel.org,
        linux-sparse@vger.kernel.org, linux-kbuild@vger.kernel.org
References: <20181021171414.22674-1-miguel.ojeda.sandonis@gmail.com>
 <20181021171414.22674-2-miguel.ojeda.sandonis@gmail.com>
 <20181021222712.GI1617@thunk.org>
From:   Bernd Petrovitsch <bernd@petrovitsch.priv.at>
Message-ID: <8fb78062-b6d4-6f2d-d943-44bec6b95ff0@petrovitsch.priv.at>
Date:   Mon, 22 Oct 2018 11:41:56 +0200
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On 22/10/2018 00:27, Theodore Y. Ts'o wrote:
> On Sun, Oct 21, 2018 at 07:14:13PM +0200, Miguel Ojeda wrote:
>> From the GCC manual:
>>
>>   fallthrough
>>
>>     The fallthrough attribute with a null statement serves as a
>>     fallthrough statement. It hints to the compiler that a statement
>>     that falls through to another case label, or user-defined label
>>     in a switch statement is intentional and thus the -Wimplicit-fallthrough
>>     warning must not trigger. The fallthrough attribute may appear
>>     at most once in each attribute list, and may not be mixed with
>>     other attributes. It can only be used in a switch statement
>>     (the compiler will issue an error otherwise), after a preceding
>>     statement and before a logically succeeding case label,
>>     or user-defined label.
>>
>>   https://gcc.gnu.org/onlinedocs/gcc/Statement-Attributes.html
> 
> Do we know if coverity understands the fallthrough attribute?  One of
> the reasons why I started using /* fallthrough */ is because it kept
> Coverity happy.

FWIW, current "eclipse" has the same "problem".

> If the conversion from /* fallthrough */ to the __fallthrough__
> attribute means that we start gethting a lot of Coverity warnings,

We could keep both.

MfG,
	Bernd
-- 
Bernd Petrovitsch                  Email : bernd@petrovitsch.priv.at
                     LUGA : http://www.luga.at