Re: [PATCH RFC 03/10] mm/gup: Pass flags down to __gup_device_huge* calls

[Christoph Hellwig]

On Wed, Jun 05, 2019 at 06:45:36PM -0700, ira.weiny@xxxxxxxxx wrote:
> From: Ira Weiny <ira.weiny@xxxxxxxxx>
> 
> 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
implementation:

http://git.infradead.org/users/hch/misc.git/commitdiff/c3d019802dbde5a4cc4160e7ec8ccba479b19f97