linux-kernel - Re: [PATCH 0/7] x86: remove always-defined CONFIG_AS

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Date:   Mon, 23 Mar 2020 12:45:56 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "Jason A . Donenfeld" <Jason@...c4.com>,
        Allison Randal <allison@...utok.net>,
        Armijn Hemel <armijn@...ldur.nl>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Ingo Molnar <mingo@...hat.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Song Liu <songliubraving@...com>,
        Zhengyuan Liu <liuzhengyuan@...inos.cn>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
        <linux-crypto@...r.kernel.org>
Subject: Re: [PATCH 0/7] x86: remove always-defined CONFIG_AS_* options

On Sun, Mar 22, 2020 at 7:09 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> arch/x86/Makefile tests instruction code by $(call as-instr, ...)
>
> Some of them are very old.
> For example, the check for CONFIG_AS_CFI dates back to 2006.
>
> We raise GCC versions from time to time, and we clean old code away.
> The same policy applied to binutils.
>
> The current minimal supported version of binutils is 2.21
>
> This is new enough to recognize the instruction in most of
> as-instr calls.

I'm quite happy to see this series; a few weekends ago I was playing
around with adding dwarf-5 support to the Linux kernel, and was
looking at these noticing there was quite a bit of cruft.
Unfortunately, I got detoured filing bugs against GNU as for dwarf-5
bugs, but the developers were very responsive and fixed them all.  I
should go find and dust off that patchset.  In the meantime, I'll try
to help review these patches. Thank you for sending them.

>
>
>
> Masahiro Yamada (7):
>   x86: remove unneeded defined(__ASSEMBLY__) check from asm/dwarf2.h
>   x86: remove always-defined CONFIG_AS_CFI
>   x86: remove always-defined CONFIG_AS_CFI_SIGNAL_FRAME
>   x86: remove always-defined CONFIG_AS_CFI_SECTIONS
>   x86: remove always-defined CONFIG_AS_SSSE3
>   x86: remove always-defined CONFIG_AS_AVX
>   x86: add comments about the binutils version to support code in
>     as-instr
>
>  arch/x86/Makefile                             | 21 +++------
>  arch/x86/crypto/Makefile                      | 32 ++++++--------
>  arch/x86/crypto/aesni-intel_avx-x86_64.S      |  3 --
>  arch/x86/crypto/aesni-intel_glue.c            | 14 +-----
>  arch/x86/crypto/blake2s-core.S                |  2 -
>  arch/x86/crypto/poly1305-x86_64-cryptogams.pl |  8 ----
>  arch/x86/crypto/poly1305_glue.c               |  6 +--
>  arch/x86/crypto/sha1_ssse3_asm.S              |  4 --
>  arch/x86/crypto/sha1_ssse3_glue.c             |  9 +---
>  arch/x86/crypto/sha256-avx-asm.S              |  3 --
>  arch/x86/crypto/sha256_ssse3_glue.c           |  8 +---
>  arch/x86/crypto/sha512-avx-asm.S              |  2 -
>  arch/x86/crypto/sha512_ssse3_glue.c           |  7 +--
>  arch/x86/include/asm/dwarf2.h                 | 43 -------------------
>  arch/x86/include/asm/xor_avx.h                |  9 ----
>  lib/raid6/algos.c                             |  2 -
>  lib/raid6/recov_ssse3.c                       |  6 ---
>  lib/raid6/test/Makefile                       |  3 --
>  18 files changed, 26 insertions(+), 156 deletions(-)
>
> --
> 2.17.1
>
> --
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-- 
Thanks,
~Nick Desaulniers