linux-kernel - Re: [PATCH rfcv2 5/8] iommu/arm-smmu-v3: Pre-allocate a per-master invalidation array

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Message-ID: <20250930115540.GF2942991@nvidia.com>
Date: Tue, 30 Sep 2025 08:55:40 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: will@...nel.org, robin.murphy@....com, joro@...tes.org,
	jean-philippe@...aro.org, miko.lenczewski@....com,
	balbirs@...dia.com, peterz@...radead.org, smostafa@...gle.com,
	kevin.tian@...el.com, praan@...gle.com,
	linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, patches@...ts.linux.dev
Subject: Re: [PATCH rfcv2 5/8] iommu/arm-smmu-v3: Pre-allocate a per-master
 invalidation array

On Mon, Sep 29, 2025 at 12:11:47PM -0700, Nicolin Chen wrote:
 
> Hmm, I am not sure how it insures against anything concurrent.

Yes, not concurrent, just if someone is later looking at the IDs list
and expecting it to be in a certain order. I could not find such a
thing so I think it is safe.

Jason