linux-kernel - Re: next-20251002: arm64: gcc-8-defconfig: Assembler messages: Error: unknown architectural extension `simd;'

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Message-Id: <a2357b92-8a8a-4d79-afb8-0bb8aee244ac@app.fastmail.com>
Date: Mon, 06 Oct 2025 13:58:41 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Naresh Kamboju" <naresh.kamboju@...aro.org>,
 Netdev <netdev@...r.kernel.org>,
 "Linux ARM" <linux-arm-kernel@...ts.infradead.org>,
 "open list" <linux-kernel@...r.kernel.org>, lkft-triage@...ts.linaro.org,
 "Linux Regressions" <regressions@...ts.linux.dev>, linux-rdma@...r.kernel.org
Cc: "Ard Biesheuvel" <ardb@...nel.org>,
 "Patrisious Haddad" <phaddad@...dia.com>,
 "Michael Guralnik" <michaelgur@...dia.com>,
 "Moshe Shemesh" <moshe@...dia.com>, "Tariq Toukan" <tariqt@...dia.com>,
 "Jakub Kicinski" <kuba@...nel.org>,
 "Dan Carpenter" <dan.carpenter@...aro.org>,
 "Anders Roxell" <anders.roxell@...aro.org>,
 "Benjamin Copeland" <benjamin.copeland@...aro.org>,
 "Nathan Chancellor" <nathan@...nel.org>
Subject: Re: next-20251002: arm64: gcc-8-defconfig: Assembler messages: Error: unknown
 architectural extension `simd;'

On Mon, Oct 6, 2025, at 13:31, Naresh Kamboju wrote:
> + linux-rdma@...r.kernel.org
>
> On Mon, 6 Oct 2025 at 17:00, Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
>> ### Build error log
>> /tmp/cclfMnj9.s: Assembler messages:
>> /tmp/cclfMnj9.s:656: Error: unknown architectural extension `simd;'
>> make[8]: *** [scripts/Makefile.build:287:
>> drivers/net/ethernet/mellanox/mlx5/core/wc.o] Error 1
>>
>> Suspecting commit,
>> $ git blame -L 269 drivers/net/ethernet/mellanox/mlx5/core/wc.c
>> fd8c8216648cd8 (Patrisious Haddad 2025-09-29 00:08:08 +0300 269)
>>          (".arch_extension simd;\n\t"
>> fd8c8216648cd net/mlx5: Improve write-combining test reliability for
>> ARM64 Grace CPUs
>>
>> ## Source
>> * Kernel version: 6.17.0
>> * Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git
>> * Git commit: 47a8d4b89844f5974f634b4189a39d5ccbacd81c
>> * Architectures: arm64
>> * Toolchains: gcc-8
>> * Kconfigs: defconfig
>>

Nathan already analyzed the problem and suggested a fix, but I could
not find a patch on the mailing list so far and sent his suggestion
now. Please check

https://lore.kernel.org/all/20251006115640.497169-1-arnd@kernel.org/

    Arnd