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Date:   Wed, 5 Jun 2019 23:18:19 -0700
From:   Christoph Hellwig <>
Cc:     Dan Williams <>, Jan Kara <>,
        Theodore Ts'o <>,
        Jeff Layton <>,
        Dave Chinner <>,
        Matthew Wilcox <>,,
        Andrew Morton <>,
        John Hubbard <>,
        Jérôme Glisse <>,,,,,
Subject: Re: [PATCH RFC 03/10] mm/gup: Pass flags down to __gup_device_huge*

On Wed, Jun 05, 2019 at 06:45:36PM -0700, wrote:
> From: Ira Weiny <>
> In order to support checking for a layout lease on a FS DAX inode these
> calls need to know if FOLL_LONGTERM was specified.
> Prepare for this with this patch.

The GUP fast argument passing is a mess.  That is why I've come up
with this as part of the (not ready) get_user_pages_fast_bvec

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