linux-kernel - RE: [PATCH v2 08/12] iommu/vt-d: Replace spin_lock_irqsave() with spin

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Date:   Tue, 14 Jun 2022 06:56:04 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        "Jason Gunthorpe" <jgg@...dia.com>
CC:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 08/12] iommu/vt-d: Replace spin_lock_irqsave() with
 spin_lock()

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Tuesday, June 14, 2022 10:52 AM
> 
> The iommu->lock is used to protect changes in root/context/pasid tables
> and domain ID allocation. There's no use case to change these resources
> in any interrupt context. Hence there's no need to disable interrupts
> when helding the spinlock.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>

with this as one-place to changing irqsave for all previous patches:

Reviewed-by: Kevin Tian <kevin.tian@...el.com>