linux-kernel - Re: [PATCH] [v2] Kbuild: move to -std=gnu11

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Message-ID: <CAK8P3a2ZBOdEWTB1K9wA0v657VTZc-BC4LkDoQ0uw8Hw8FfSyg@mail.gmail.com>
Date:   Tue, 1 Mar 2022 15:45:51 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Fangrui Song <maskray@...gle.com>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Masahiro Yamada <masahiroy@...nel.org>, llvm@...ts.linux.dev,
        Jonathan Corbet <corbet@....net>,
        Federico Vaga <federico.vaga@...a.pv.it>,
        Alex Shi <alexs@...nel.org>, Hu Haowen <src.res@...il.cn>,
        Michal Marek <michal.lkml@...kovi.net>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-doc-tw-discuss@...ts.sourceforge.net,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Intel Graphics <intel-gfx@...ts.freedesktop.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        greybus-dev@...ts.linaro.org, linux-staging@...ts.linux.dev,
        linux-btrfs <linux-btrfs@...r.kernel.org>
Subject: Re: [PATCH] [v2] Kbuild: move to -std=gnu11

On Mon, Feb 28, 2022 at 10:41 PM Fangrui Song <maskray@...gle.com> wrote:
> >
> >More precisely, the semantics of "extern inline" functions changed
> >between ISO C90 and ISO C99.
>
> Perhaps a clearer explanation to readers is: "extern inline" and "inline" swap
> semantics with gnu_inline (-fgnu89-inline or __attribute__((__gnu_inline__))).
>
> >That's the only concern I have, which I doubt is an issue. The kernel
> >is already covered by the function attribute as you note.
> >
> >Just to have some measure:
> >$ git grep -rn "extern inline" | wc -l
> >116
>
> "^inline" behaves like C99+ "extern inline"
>
> Agree this is handled by
>
>      #define inline inline __gnu_inline __inline_maybe_unused notrace
>

Ok, I've reworded it again, but kept it a bit shorter, I don't think we
need the full explanation in this patch description in the end.

Thanks,

      Arnd