Hi Daniel, On Mon, 17 May 2021 17:29:35 +0200 Daniel Vetter <daniel.vetter@xxxxxxxx> wrote: > > On Mon, May 10, 2021 at 9:30 AM Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote: > > > > On Mon, May 10, 2021 at 09:16:58AM +0200, Daniel Vetter wrote: > > > > End result: not pulling it, unless somebody can explain to me in small > > > > words why I'm wrong and have the mental capacity of a damaged rodent. > > > > > > No rodents I think, just more backstory of how this all fits. tldr; > > > pin_user_pages is the only safe use of this vb2 userptr thing. > > > > Yes, which is why I advocate for just ripping the follow_pfn path > > out entirely. It could have been used for crazy ad dangerous peer to > > peer transfers outside of any infrastructure making it safe, or for > > pre-CMA kernel memory carveouts for lage contiguous memory allocations > > (which are pretty broken by design as well). So IMHO the only sensible > > thing is to remove this cruft entirely, and if it breaks a currently > > working setup (which I think is unlikely) we'll have to make sure it > > can work the proper way. > > Since I'm not getting any cozy consenus vibes here on any option I > think I'll just drop this. > > Stephen, can you pls drop > > git://anongit.freedesktop.org/drm/drm topic/iomem-mmap-vs-gup > > from linux-next? It's not going anywhere. I'll also go ahead and > delete the branch, to make sure you catch this update :-) I have dropped this now. Thanks for letting me know. -- Cheers, Stephen Rothwell
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