linux-kernel - Re: [PATCH net-next V2] net/mlx5: Improve write-combining test reliability for ARM64 Grace CPUs

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Message-ID: <cc0a6c0f-9aa3-45a5-bcd0-9c02e1b21a8f@nvidia.com>
Date: Tue, 16 Sep 2025 16:13:13 +0300
From: Patrisious Haddad <phaddad@...dia.com>
To: Jason Gunthorpe <jgg@...dia.com>
Cc: Arnd Bergmann <arnd@...db.de>, Nathan Chancellor <nathan@...nel.org>,
 Tariq Toukan <tariqt@...dia.com>, Catalin Marinas <catalin.marinas@....com>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew+netdev@...n.ch>,
 "David S . Miller" <davem@...emloft.net>, Saeed Mahameed
 <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>,
 Mark Bloch <mbloch@...dia.com>, Sabrina Dubroca <sd@...asysnail.net>,
 Netdev <netdev@...r.kernel.org>, linux-rdma@...r.kernel.org,
 linux-kernel@...r.kernel.org, Gal Pressman <gal@...dia.com>,
 Leon Romanovsky <leonro@...dia.com>, Michael Guralnik
 <michaelgur@...dia.com>, Moshe Shemesh <moshe@...dia.com>,
 Will Deacon <will@...nel.org>, Alexander Gordeev <agordeev@...ux.ibm.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Christian Borntraeger <borntraeger@...ux.ibm.com>,
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 Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
 Vasily Gorbik <gor@...ux.ibm.com>, Heiko Carstens <hca@...ux.ibm.com>,
 "H. Peter Anvin" <hpa@...or.com>, Justin Stitt <justinstitt@...gle.com>,
 linux-s390@...r.kernel.org, llvm@...ts.linux.dev,
 Ingo Molnar <mingo@...hat.com>, Bill Wendling <morbo@...gle.com>,
 Nick Desaulniers <ndesaulniers@...gle.com>,
 Salil Mehta <salil.mehta@...wei.com>, Sven Schnelle <svens@...ux.ibm.com>,
 Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
 Yisen Zhuang <yisen.zhuang@...wei.com>, Leon Romanovsky
 <leonro@...lanox.com>, Linux-Arch <linux-arch@...r.kernel.org>,
 linux-arm-kernel@...ts.infradead.org, Mark Rutland <mark.rutland@....com>,
 Michael Guralnik <michaelgur@...lanox.com>, patches@...ts.linux.dev,
 Niklas Schnelle <schnelle@...ux.ibm.com>, Jijie Shao <shaojijie@...wei.com>
Subject: Re: [PATCH net-next V2] net/mlx5: Improve write-combining test
 reliability for ARM64 Grace CPUs

On 9/16/2025 3:27 PM, Jason Gunthorpe wrote:
> On Tue, Sep 16, 2025 at 12:47:17PM +0300, Patrisious Haddad wrote:
>
>> Using the correct CC flags by itself is sufficient and correct - and I don't
>> see other neon users using the ".arch_extension simd" you mentioned , so why
>> do you think it is needed here ?
> If you do it as Arnd suggests then we don't need a another file,
> makefile changes and so on. You can just drop a 5 line inline right
> before it is used.
I see, thanks for clarifying that, will try it and test it locally, if 
that does work , and gives identical results then indeed that it is way 
better/cleaner, will send V3 as such after testing.
Patrisious.
>
> Jason