From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michal Hocko <mhocko@kernel.org>
Subject: Re: [PATCH 4/6] mm: introduce page->dma_pinned_flags, _count
Date: Wed, 17 Oct 2018 13:09:52 +0200
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On Tue 16-10-18 18:48:23, John Hubbard wrote:
[...]
> It's hard to say exactly what the active/inactive/unevictable list should
> be when DMA is done and put_user_page*() is called, because we don't know
> if some device read, wrote, or ignored any of those pages. Although if 
> put_user_pages_dirty() is called, that's an argument for "active", at least.

Any reason to not use putback_lru_page?

Please note I haven't really got through your patches to have a wider
picture of the change so this is just hint for the LRU part of the
issue.
-- 
Michal Hocko
SUSE Labs