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

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Message-ID: <20201127153657.GJ401619@phenom.ffwll.local>
Date:   Fri, 27 Nov 2020 16:36:57 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        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 Fri, Nov 27, 2020 at 09:12:25AM -0400, Jason Gunthorpe wrote:
> 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?

I was kinda hoping Andrew would pick it all up.

> > 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

Same here tbh :-)

> >   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

Yeah your split makes sense. I'll reorder them for the next round (which
I'm prepping right now).
> 
> 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.

Yeah could do. Andrew, any preferences?
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch