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From: Aneesh Kumar K.V <aneesh.kumar@kernel.org>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev,
	Robin Murphy <robin.murphy@arm.com>,
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	Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
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Subject: Re: [PATCH v7 20/22] dma: swiotlb: free dynamic pools from process
 context
In-Reply-To: <20260713194131.GZ3133966@ziepe.ca>
References: <20260701054926.825925-1-aneesh.kumar@kernel.org>
 <20260701054926.825925-21-aneesh.kumar@kernel.org>
 <20260713194131.GZ3133966@ziepe.ca>
Date: Tue, 14 Jul 2026 10:33:49 +0530
Message-ID: <yq5ao6gamabu.fsf@kernel.org>
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Jason Gunthorpe <jgg@ziepe.ca> writes:

> On Wed, Jul 01, 2026 at 11:19:24AM +0530, Aneesh Kumar K.V (Arm) wrote:
>
>> @@ -840,7 +843,7 @@ static void swiotlb_del_pool(struct device *dev, struct io_tlb_pool *pool)
>>  	list_del_rcu(&pool->node);
>>  	spin_unlock_irqrestore(&dev->dma_io_tlb_lock, flags);
>>  
>> -	call_rcu(&pool->rcu, swiotlb_dyn_free);
>> +	swiotlb_schedule_dyn_free(pool);
>
> This knows if the pool has cc_shared memory in it since there is now a
> flag tracking that? So should the work queue version be conditional on
> that flag?
>

We could definitely do that. I was not sure whether it was worth it,
considering that it would add two paths for SWIOTLB dynamic free.

-aneesh