linux-kernel - Re: [PATCH net-next V6] net/mlx5: Improve write-combining test reliability for ARM64 Grace CPUs

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Message-ID: <20251001145514.GC3024065@nvidia.com>
Date: Wed, 1 Oct 2025 11:55:14 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Paolo Abeni <pabeni@...hat.com>
Cc: Tariq Toukan <tariqt@...dia.com>, Saeed Mahameed <saeedm@...dia.com>,
	Leon Romanovsky <leon@...nel.org>, Mark Bloch <mbloch@...dia.com>,
	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>,
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	Alexander Gordeev <agordeev@...ux.ibm.com>,
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	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
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	Catalin Marinas <catalin.marinas@....com>,
	Jakub Kicinski <kuba@...nel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next V6] net/mlx5: Improve write-combining test
 reliability for ARM64 Grace CPUs

On Wed, Oct 01, 2025 at 11:28:09AM +0200, Paolo Abeni wrote:

> > +static void mlx5_iowrite64_copy(struct mlx5_wc_sq *sq, __be32 mmio_wqe[16],
> > +				size_t mmio_wqe_size, unsigned int offset)
> > +{
> > +#if IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && IS_ENABLED(CONFIG_ARM64)
> > +	if (cpu_has_neon()) {
> > +		kernel_neon_begin();
> > +		asm volatile
> > +		(".arch_extension simd;\n\t"
> 
> Here I'm observing build errors with aarch64-linux-gnu-gcc 12.1.1
> 20220507 (Red Hat Cross 12.1.1-1):

> /tmp/cchqHdeI.s: Assembler messages:
> /tmp/cchqHdeI.s:746: Error: unknown architectural extension `simd;'

This is a binutils error not gcc.. What is the binutils version?

2.30 is the lowest that v6.16 supports..

Jason