linux-kernel - Re: [PATCH 4/4] arm64: drop binutils version checks

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Message-Id: <f79695b7-f0c0-442f-963d-6ecae246ebf5@app.fastmail.com>
Date: Tue, 08 Apr 2025 15:10:57 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Will Deacon" <will@...nel.org>, "Arnd Bergmann" <arnd@...nel.org>
Cc: linux-kbuild@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
 "Ard Biesheuvel" <ardb@...nel.org>, "Borislav Petkov" <bp@...en8.de>,
 "Brian Gerst" <brgerst@...il.com>,
 "Catalin Marinas" <catalin.marinas@....com>,
 "Dave Hansen" <dave.hansen@...ux.intel.com>,
 "Herbert Xu" <herbert@...dor.apana.org.au>, "Ingo Molnar" <mingo@...hat.com>,
 "Jonathan Corbet" <corbet@....net>, "Marc Zyngier" <maz@...nel.org>,
 "Mark Rutland" <mark.rutland@....com>,
 "Masahiro Yamada" <masahiroy@...nel.org>,
 "Nathan Chancellor" <nathan@...nel.org>,
 "Nicolas Schier" <nicolas@...sle.eu>, "Takashi Iwai" <tiwai@...e.com>,
 "Thomas Gleixner" <tglx@...utronix.de>, "Uros Bizjak" <ubizjak@...il.com>,
 linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-raid@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH 4/4] arm64: drop binutils version checks

On Tue, Apr 8, 2025, at 10:46, Will Deacon wrote:
> Hi Arnd,
>
> On Mon, Apr 07, 2025 at 11:41:16AM +0200, Arnd Bergmann wrote:
>> From: Arnd Bergmann <arnd@...db.de>
>> 
>> Now that gcc-8 and binutils-2.30 are the minimum versions, a lot of
>> the individual feature checks can go away for simplification.
>> 
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>> ---
>>  arch/arm64/Kconfig              | 37 ++-------------------------------
>>  arch/arm64/Makefile             | 21 ++-----------------
>>  arch/arm64/include/asm/rwonce.h |  4 ----
>>  arch/arm64/kvm/Kconfig          |  1 -
>>  arch/arm64/lib/xor-neon.c       |  2 +-
>>  5 files changed, 5 insertions(+), 60 deletions(-)
>
> Since some of these checks are dynamic (i.e. they try passing various
> options to the tools to see if they barf), have you checked that the
> minimum supported version of clang implements them all?

I did some randconfig build testing with clang-13/lld-13, since that
is the oldest supported version, and checked that the options are
all supported. I'm pretty sure it's been there for a long time before
that already.

      Arnd