linux-kernel - Re: [PATCH v6 00/17] follow

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Date:   Fri, 27 Nov 2020 09:12:25 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Daniel Vetter <daniel.vetter@...ll.ch>
Cc:     DRI Development <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>, kvm@...r.kernel.org,
        linux-mm@...ck.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: [PATCH v6 00/17] follow_pfn and other iomap races

On Thu, Nov 19, 2020 at 03:41:29PM +0100, Daniel Vetter wrote:
> I feel like this is ready for some wider soaking. Since the remaining bits
> are all kinda connnected probably simplest if it all goes through -mm.

Did you figure out a sumbission plan for this stuff?

> Daniel Vetter (17):
>   drm/exynos: Stop using frame_vector helpers
>   drm/exynos: Use FOLL_LONGTERM for g2d cmdlists
>   misc/habana: Stop using frame_vector helpers
>   misc/habana: Use FOLL_LONGTERM for userptr
>   mm/frame-vector: Use FOLL_LONGTERM
>   media: videobuf2: Move frame_vector into media subsystem

At the very least it would be good to get those in right away.

>   mm: Add unsafe_follow_pfn
>   media/videbuf1|2: Mark follow_pfn usage as unsafe
>   vfio/type1: Mark follow_pfn as unsafe

I'm surprised nobody from VFIO has remarked on this, I think thety
won't like it

>   mm: Close race in generic_access_phys
>   PCI: Obey iomem restrictions for procfs mmap
>   /dev/mem: Only set filp->f_mapping
>   resource: Move devmem revoke code to resource framework
>   sysfs: Support zapping of binary attr mmaps
>   PCI: Revoke mappings like devmem

This sequence seems fairly stand alone, and in good shape as well

My advice is to put the done things on a branch and get Stephen to put
them in linux-next. You can send a PR to Lins. There is very little mm
stuff in here, and cross subsystem stuff works better in git land,
IMHO.

Jason