linux-ext4 - Re: [PATCH 0/2] Compiler Attributes: _

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Message-ID: <CANiq72ktOU91ghnT4eRPvBzO-xq3_Kq-RCyCB1_VSf2b+17YXw@mail.gmail.com>
Date:   Mon, 22 Oct 2018 23:23:45 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Dan <dan.carpenter@...cle.com>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Olof Johansson <olof@...m.net>,
        Konstantin Ryabitsev <konstantin@...uxfoundation.org>,
        David Miller <davem@...emloft.net>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Paul Lawrence <paullawrence@...gle.com>,
        Sandipan Das <sandipan@...ux.vnet.ibm.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Will Deacon <will.deacon@....com>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Paul Burton <paul.burton@...s.com>,
        David Rientjes <rientjes@...gle.com>, Willy Tarreau <w@....eu>,
        Martin Sebor <msebor@...il.com>,
        Christopher Li <sparse@...isli.org>,
        Jonathan Corbet <corbet@....net>, "Ted Ts'o" <tytso@....edu>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Joe Perches <joe@...ches.com>, Arnd Bergmann <arnd@...db.de>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Stefan Agner <stefan@...er.ch>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        linux-sparse@...r.kernel.org, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH 0/2] Compiler Attributes: __fallthrough

On Mon, Oct 22, 2018 at 6:54 PM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
>
> On Mon, Oct 22, 2018 at 2:48 AM Miguel Ojeda
> <miguel.ojeda.sandonis@...il.com> wrote:
> >
> > On Sun, Oct 21, 2018 at 8:29 PM Greg Kroah-Hartman
> > <gregkh@...uxfoundation.org> wrote:
> > >
> > > Will this work with all of the static tools that are currently looking
> > > for the comment instead?  I know coverity handles that, what about
> > > others?
> >
> > I will also contact the different tools about this.
>
> Let's contact the authors of these tools if they don't parse the
> attribute.  I prefer to have the attributes rather than specifically
> formatted comments.

Sorry, not sure what you mean -- isn't that what I said? Greg was
asking whether tools would support the attribute equally well compared
to the comment parsing; not the comments.

>
> I do think this may be tricky to provide backwards support for though;
> Miguel, do you have info on which versions of GCC support comments vs
> attribute?

It is in the commit message:

    """
    In C mode, GCC supports the __fallthrough__ attribute since 7.1,
    the same time the warning and the comment parsing were introduced.
    """

Cheers,
Miguel