linux-kernel - Re: [PATCH v1 2/9] iommu/arm-smmu-v3: Add alloc_id/free_id functions to arm_smmu

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Message-ID: <20260102155415.GB125162@nvidia.com>
Date: Fri, 2 Jan 2026 11:54:15 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: will@...nel.org, robin.murphy@....com, joro@...tes.org, jpb@...nel.org,
	praan@...gle.com, miko.lenczewski@....com,
	linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, patches@...ts.linux.dev
Subject: Re: [PATCH v1 2/9] iommu/arm-smmu-v3: Add alloc_id/free_id functions
 to arm_smmu_invs

On Fri, Dec 19, 2025 at 12:56:17PM -0800, Nicolin Chen wrote:
> Again, my intention is to avoid iterating the array since merge
> and unref functions are already doing that in their first loops.

It is not a performance path, and double iterating like this is much
easier to implement with clearer error flows.

Jason