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

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Message-ID: <20250916122715.GA1086830@nvidia.com>
Date: Tue, 16 Sep 2025 09:27:15 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Patrisious Haddad <phaddad@...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>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	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 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.

Jason