Re: [PATCH 0/7] x86: remove always-defined CONFIG_AS_* options

From: Nick Desaulniers <ndesaulniers@google.com>
To: Masahiro Yamada <masahiroy@kernel.org>
Cc: "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
	<x86@kernel.org>, Ingo Molnar <mingo@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bp@alien8.de>, "H . Peter Anvin" <hpa@zytor.com>,
	LKML <linux-kernel@vger.kernel.org>,
	"Jason A . Donenfeld" <Jason@zx2c4.com>,
	Allison Randal <allison@lohutok.net>,
	Armijn Hemel <armijn@tjaldur.nl>,
	"David S. Miller" <davem@davemloft.net>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	Ingo Molnar <mingo@redhat.com>,
	Kate Stewart <kstewart@linuxfoundation.org>,
	Song Liu <songliubraving@fb.com>,
	Zhengyuan Liu <liuzhengyuan@kylinos.cn>,
	clang-built-linux <clang-built-linux@googlegroups.com>,
	"open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
	<linux-crypto@vger.kernel.org>
Subject: Re: [PATCH 0/7] x86: remove always-defined CONFIG_AS_* options
Date: Mon, 23 Mar 2020 12:45:56 -0700	[thread overview]
Message-ID: <CAKwvOdm1B=Wc6zcxpapcbeReX0_2V3AiqxGUgikL4ypztZkUEg@mail.gmail.com> (raw)
In-Reply-To: <20200323020844.17064-1-masahiroy@kernel.org>

On Sun, Mar 22, 2020 at 7:09 PM Masahiro Yamada <masahiroy@kernel.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