On Mon, 2017-04-10 at 17:09 +0200, gregkh@linuxfoundation.org wrote:
> This is a note to let you know that I've just added the patch titled
> 
>     mm/huge_memory.c: respect FOLL_FORCE/FOLL_COW for thp
> 
> to the 4.4-stable tree which can be found at:
>     http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
> 
> The filename of the patch is:
>      mm-huge_memory.c-respect-foll_force-foll_cow-for-thp.patch
> and it can be found in the queue-4.4 subdirectory.
> 
> If you, or anyone else, feels it should not be added to the stable tree,
> please let <stable@vger.kernel.org> know about it.
> 
> 
> From 303681d5d538d81b5e23754515202b5b9febd2e9 Mon Sep 17 00:00:00 2001
> From: Keno Fischer <keno@juliacomputing.com>
> Date: Tue, 24 Jan 2017 15:17:48 -0800
> Subject: mm/huge_memory.c: respect FOLL_FORCE/FOLL_COW for thp
> 
> From: Keno Fischer <keno@juliacomputing.com>
> 
> commit 8310d48b125d19fcd9521d83b8293e63eb1646aa upstream.
[...]
>  - Drop change to follow_devmap_pmd()
>  - pmd_dirty() is not available; check the page flags as in older
>    backports of can_follow_write_pte()
>  - Adjust context]
[...]

Aside from the fact that I got this backport wrong, I don't think you
need the main change here.  In 4.4, all arches that define
CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE also define pmd_dirty().

Ben.

-- 
Ben Hutchings
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