linux-kernel - Re: [PATCH v9 6/7] iommu/arm-smmu-v3: Add arm_smmu_invs based arm_smmu_domain_inv

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Message-ID: <20260128000522.GU1134360@nvidia.com>
Date: Tue, 27 Jan 2026 20:05:22 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: Pranjal Shrivastava <praan@...gle.com>, will@...nel.org,
	jean-philippe@...aro.org, robin.murphy@....com, joro@...tes.org,
	balbirs@...dia.com, miko.lenczewski@....com, peterz@...radead.org,
	kevin.tian@...el.com, linux-arm-kernel@...ts.infradead.org,
	iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 6/7] iommu/arm-smmu-v3: Add arm_smmu_invs based
 arm_smmu_domain_inv_range()

On Tue, Jan 27, 2026 at 12:14:37PM -0800, Nicolin Chen wrote:
> And I don't see any non-hackable way for CONFIG_QUEUED_RWLOCKS=n
> unless CONFIG_PREEMPT_RT=y, which would be a different ball game
> that I assume SMMUv3 might not be completely compatible with.

SMMUv3 should work with PREEMPT_RT=y

Preempt is a good point, I don't know what the rules are for preempt
at all. So it is OK to be conservative here, I doubt we could measure
the difference anyhow

Jason