linux-kernel - Re: [PATCH v3 3/5] iommu/sva: Stop using ioasid

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Date:   Tue, 21 Feb 2023 22:19:05 -0800
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        Jason Gunthorpe <jgg@...dia.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "Jean-Philippe Brucker" <jean-philippe@...aro.com>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will@...nel.org>,
        "David Woodhouse" <dwmw2@...radead.org>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "X86 Kernel" <x86@...nel.org>,
        "Jiang, Dave" <dave.jiang@...el.com>, jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH v3 3/5] iommu/sva: Stop using ioasid_set for SVA

Hi Kevin,

On Wed, 22 Feb 2023 02:22:48 +0000, "Tian, Kevin" <kevin.tian@...el.com>
wrote:

> > From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> > Sent: Friday, February 17, 2023 8:00 AM
> >
> > +	ret = ida_alloc_range(&iommu_global_pasid_ida, min, max,
> > GFP_KERNEL);
> > +	if (ret < min)
> > +		goto out;  
> 
> ioasid_alloc() currently uses GFP_ATOMIC.
> 
> since this is kind of a replacement w/o functional impact, it'd be cleaner
> from bisect p.o.v. to have a separate patch changing GFP_ATOMIC
> to GFP_KERNEL in ioasid_alloc() and then this patch.
> 
makes sense,

Thanks,

Jacob