linux-kernel - Re: [PATCH] Kconfig: eradicate CC_HAS_ASM

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Message-ID: <Yv/EWqYy0HzrpO2u@zn.tnic>
Date:   Fri, 19 Aug 2022 19:11:54 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        linux-kbuild@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-um@...ts.infradead.org,
        kvm@...r.kernel.org, llvm@...ts.linux.dev,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: Re: [PATCH] Kconfig: eradicate CC_HAS_ASM_GOTO

On Fri, Aug 19, 2022 at 10:00:53AM -0700, Nick Desaulniers wrote:
> GCC has supported asm goto since 4.5, and Clang has since version 9.0.0.
> The minimum supported versions of these tools for the build according to
> Documentation/process/changes.rst are 5.1 and 11.0.0 respectively.
> 
> Remove the feature detection script, Kconfig option, and clean up some
> fallback code that is no longer supported.
> 
> The removed script was also testing for a GCC specific bug that was
> fixed in the 4.7 release.
> 
> The script was also not portable; users of Dash shell reported errors
> when it was invoked.
> 
> Link: https://lore.kernel.org/lkml/CAK7LNATSr=BXKfkdW8f-H5VT_w=xBpT2ZQcZ7rm6JfkdE+QnmA@mail.gmail.com/
> Link: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48637
> Reported-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
> Suggested-by: Masahiro Yamada <masahiroy@...nel.org>
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
> ---
>  Documentation/kbuild/kconfig-language.rst |  4 ++--
>  arch/Kconfig                              |  3 +--
>  arch/um/include/asm/cpufeature.h          |  4 ++--
>  arch/x86/Makefile                         |  4 ----
>  arch/x86/include/asm/cpufeature.h         |  4 ++--
>  arch/x86/include/asm/rmwcc.h              | 19 +------------------
>  arch/x86/kvm/emulate.c                    |  2 +-
>  init/Kconfig                              |  4 ----
>  scripts/gcc-goto.sh                       | 22 ----------------------
>  tools/arch/x86/include/asm/rmwcc.h        | 21 ---------------------
>  10 files changed, 9 insertions(+), 78 deletions(-)
>  delete mode 100755 scripts/gcc-goto.sh

Nice and good riddance.

Acked-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette