linux-kernel - Re: [PATCH v11 01/12] iova: Export alloc_iova_fast() and free_iova

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Date:   Wed, 25 Aug 2021 10:55:41 +0100
From:   Will Deacon <will@...nel.org>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Xie Yongji <xieyongji@...edance.com>, jasowang@...hat.com,
        stefanha@...hat.com, sgarzare@...hat.com, parav@...dia.com,
        hch@...radead.org, christian.brauner@...onical.com,
        rdunlap@...radead.org, willy@...radead.org,
        viro@...iv.linux.org.uk, axboe@...nel.dk, bcrl@...ck.org,
        corbet@....net, mika.penttila@...tfour.com,
        dan.carpenter@...cle.com, joro@...tes.org,
        gregkh@...uxfoundation.org, zhe.he@...driver.com,
        xiaodong.liu@...el.com, joe@...ches.com, robin.murphy@....com,
        songmuchun@...edance.com,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 01/12] iova: Export alloc_iova_fast() and
 free_iova_fast()

On Tue, Aug 24, 2021 at 02:08:33PM -0400, Michael S. Tsirkin wrote:
> On Wed, Aug 18, 2021 at 08:06:31PM +0800, Xie Yongji wrote:
> > Export alloc_iova_fast() and free_iova_fast() so that
> > some modules can make use of the per-CPU cache to get
> > rid of rbtree spinlock in alloc_iova() and free_iova()
> > during IOVA allocation.
> > 
> > Signed-off-by: Xie Yongji <xieyongji@...edance.com>
> 
> 
> This needs ack from iommu maintainers. Guys?

Looks fine to me:

Acked-by: Will Deacon <will@...nel.org>

Will