linux-kernel - Re: [PATCH v10 01/16] iommu: Move iommu fault data to linux/iommu.h

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Date: Fri, 26 Jan 2024 15:26:26 +0100
From: Joel Granados <j.granados@...sung.com>
To: Baolu Lu <baolu.lu@...ux.intel.com>
CC: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>, Robin
	Murphy <robin.murphy@....com>, Jason Gunthorpe <jgg@...pe.ca>, Kevin Tian
	<kevin.tian@...el.com>, Jean-Philippe Brucker <jean-philippe@...aro.org>,
	Nicolin Chen <nicolinc@...dia.com>, Yi Liu <yi.l.liu@...el.com>, Jacob Pan
	<jacob.jun.pan@...ux.intel.com>, Longfang Liu <liulongfang@...wei.com>, Yan
	Zhao <yan.y.zhao@...el.com>, <iommu@...ts.linux.dev>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Jason Gunthorpe <jgg@...dia.com>
Subject: Re: [PATCH v10 01/16] iommu: Move iommu fault data to linux/iommu.h

On Thu, Jan 25, 2024 at 07:21:53PM +0800, Baolu Lu wrote:
> On 2024/1/25 17:17, Joel Granados wrote:
> > On Mon, Jan 22, 2024 at 01:42:53PM +0800, Lu Baolu wrote:
> >> The iommu fault data is currently defined in uapi/linux/iommu.h, but is
> >> only used inside the iommu subsystem. Move it to linux/iommu.h, where it
> >> will be more accessible to kernel drivers.
> >>
> >> With this done, uapi/linux/iommu.h becomes empty and can be removed from
> >> the tree.
> > The reason for removing this [1] is that it is only being used by
> > internal code in the kernel. What happens with usespace code that have
> > used these definitions? Should we deprecate instead of just removing?
> 
> The interfaces to deliver I/O page faults to user space have never been
> implemented in the Linux kernel before. Therefore, from a uAPI point of
> view, this definition is actually dead code.
thx for the explanation.
I was thinking it was something like that. Just wanted to make sure.

Best

-- 

Joel Granados

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