linux-kernel - Re: [PATCH v9 3/7] iommu/arm-smmu-v3: Introduce a per-domain arm_smmu

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Message-ID: <20260126152159.GL1134360@nvidia.com>
Date: Mon, 26 Jan 2026 11:21:59 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: Will Deacon <will@...nel.org>
Cc: Nicolin Chen <nicolinc@...dia.com>, jean-philippe@...aro.org,
	robin.murphy@....com, joro@...tes.org, balbirs@...dia.com,
	miko.lenczewski@....com, peterz@...radead.org, kevin.tian@...el.com,
	praan@...gle.com, linux-arm-kernel@...ts.infradead.org,
	iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 3/7] iommu/arm-smmu-v3: Introduce a per-domain
 arm_smmu_invs array

On Mon, Jan 26, 2026 at 02:54:38PM +0000, Will Deacon wrote:
> There's the usual scary ordering worries with this stuff, but they exist
> with refcount_read() too. We're ok because cur->users is address dependent
> on the read of the invalidation array pointer, which is RCU protected.
> 
> (I think!)

This has been my understanding at least :\

Jason