linux-kernel - Re: [PATCH] string.h: work around for increased stack usage

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Message-ID: <CAK8P3a0Zi9B69Yhg9H8UqfnA5RHHk1RrGvx757ejwJcAupf1cg@mail.gmail.com>
Date:   Mon, 2 Oct 2017 11:02:19 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc:     David Laight <David.Laight@...lab.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-media @ vger . kernel . org" <linux-media@...r.kernel.org>,
        "linux-kernel @ vger . kernel . org" <linux-kernel@...r.kernel.org>,
        "kasan-dev @ googlegroups . com" <kasan-dev@...glegroups.com>,
        "linux-kbuild @ vger . kernel . org" <linux-kbuild@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] string.h: work around for increased stack usage

On Mon, Oct 2, 2017 at 10:40 AM, Arnd Bergmann <arnd@...db.de> wrote:
>
>  void fortify_panic(const char *name) __noreturn __cold;
> +
> +/* work around GCC PR82365 */
> +#if defined(CONFIG_KASAN) && !defined(__clang__) && GCC_VERSION <= 80000
> +#define fortify_panic(x) \
> +       do { \
> +               asm volatile(""); \
> +               fortify_panic(x); \
> +       } while (0)
> +#endif

This broke the build for the fortify_panic() definition in lib/string.c which
clashes with the macro. I've fixed it locally by renaming it to __fortify_panic,
but won't post the fixed version until I get some feedback on the basic
approach.

      Arnd