linux-kernel - Re: [PATCH v10 0/8] iommu/arm-smmu-v3: Introduce an RCU-protected invalidation array

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Message-ID: <aXi_qqx8oNn44UbS@willie-the-truck>
Date: Tue, 27 Jan 2026 13:37:46 +0000
From: Will Deacon <will@...nel.org>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: jean-philippe@...aro.org, robin.murphy@....com, joro@...tes.org,
	jgg@...dia.com, 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 v10 0/8] iommu/arm-smmu-v3: Introduce an RCU-protected
 invalidation array

On Mon, Jan 26, 2026 at 07:09:11PM -0800, Nicolin Chen wrote:
> Changelog
> v10:
>  * Rebase on arm/smmu/updates
>  * Add Reviewed-by from Pranjal
>  * Fix typo in kdoc and update comments
>  * Add dma_wmb() in arm_smmu_write_entry()
>  * Drop free_fn from arm_smmu_invs_unref()
>  * Replace refcount_t users with WRITE_ONCE/READ_ONCE()
>  * Verify num_trashes in arm_smmu_v3_invs_test_verify()

I think it probably just slipped through the cracks, but Pranjal had a
concern in v9 about the rwlock not being irqsafe:

https://lore.kernel.org/r/aXND9YJTwm6om689@google.com

Did that get discussed someplace that I missed?

Will