Re: [PATCH] userfaultfd: change src_folio after ensuring it's unpinned in UFFDIO_MOVE

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To: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Subject: Re: [PATCH] userfaultfd: change src_folio after ensuring it's unpinned in UFFDIO_MOVE
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Date: Thu, 4 Apr 2024 13:37:29 -0700
Cc: David Hildenbrand <david@xxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Lokesh Gidra <lokeshgidra@xxxxxxxxxx>, linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, kernel-team@xxxxxxxxxxx, aarcange@xxxxxxxxxx, peterx@xxxxxxxxxx, zhengqi.arch@xxxxxxxxxxxxx, kaleshsingh@xxxxxxxxxx, ngeoffray@xxxxxxxxxx
In-reply-to: <CAJuCfpEyb5tWGFUGMREj1zUBSiE3HNueHSPxGcPFnAwdfw6qmA@mail.gmail.com>
References: <20240404171726.2302435-1-lokeshgidra@google.com> <Zg7hrt5HudXLBUn_@casper.infradead.org> <CAJuCfpHvb5Jt6J1P9aHVdRWYUHmBL1edfp7QHn=jF88gJRD7RA@mail.gmail.com> <adce9a6f-fccf-4c9b-8ca3-3140a6a3d326@redhat.com> <CAJuCfpEyb5tWGFUGMREj1zUBSiE3HNueHSPxGcPFnAwdfw6qmA@mail.gmail.com>

On Thu, 4 Apr 2024 13:23:08 -0700 Suren Baghdasaryan <surenb@xxxxxxxxxx> wrote:

> > Agreed, I don't think it is required for ->index. (I also don't spot any
> > corresponding READ_ONCE)
> 
> Since this patch just got Ack'ed, I'll wait for Andrew to take it into
> mm-unstable and then will send a fix removing those WRITE_ONCE(). That
> way we won't have merge conflicts,

Yes please, it's an unrelated thing.

References:
- [PATCH] userfaultfd: change src_folio after ensuring it's unpinned in UFFDIO_MOVE
  - From: Lokesh Gidra
- Re: [PATCH] userfaultfd: change src_folio after ensuring it's unpinned in UFFDIO_MOVE
  - From: Matthew Wilcox
- Re: [PATCH] userfaultfd: change src_folio after ensuring it's unpinned in UFFDIO_MOVE
  - From: Suren Baghdasaryan
- Re: [PATCH] userfaultfd: change src_folio after ensuring it's unpinned in UFFDIO_MOVE
  - From: Suren Baghdasaryan

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