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

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Message-ID: <aXjhfKEiPUWX58Gg@Asurada-Nvidia>
Date: Tue, 27 Jan 2026 08:02:04 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: Will Deacon <will@...nel.org>
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 Tue, Jan 27, 2026 at 01:37:46PM +0000, Will Deacon wrote:
> 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?

My bad. I missed it. I'll reply there.

Nicolin