linux-kernel - Re: [PATCH rfcv1 4/8] iommu/arm-smmu-v3: Introduce a per-domain arm_smmu

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Message-ID: <20250908155149.GD789684@nvidia.com>
Date: Mon, 8 Sep 2025 12:51:49 -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, zhangzekun11@...wei.com,
	linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, patches@...ts.linux.dev
Subject: Re: [PATCH rfcv1 4/8] iommu/arm-smmu-v3: Introduce a per-domain
 arm_smmu_invs array

On Sat, Sep 06, 2025 at 01:16:45AM -0700, Nicolin Chen wrote:
> > 	/*
> > 	 * A sorted array allows batching invalidations together for fewer SYNCs.
> > 	 * Also, ATS must follow the ASID/VMID invalidation SYNC.
> > 	 */
> > 	sort_nonatomic(new_invs->inv, new_invs->num_invs,
> > 		       sizeof(add_invs->inv[0]), arm_smmu_invs_cmp, NULL);
> > 	return new_invs;

This should be deleted, merge sort always makes sorted lists.

Jason