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    Subject[PATCH 0/2] do not squash mapping flags and gfp_mask together (was: Re: [PATCH -v2] mm: Don't use radix tree writeback tags for pages in)
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    On Thu 01-09-16 11:13:47, Michal Hocko wrote:
    > On Wed 31-08-16 14:30:31, Andrew Morton wrote:
    > > On Wed, 31 Aug 2016 10:14:59 +0100 Mel Gorman <mgorman@techsingularity.net> wrote:
    [...]
    > > > I didn't see anything wrong with the patch but it's worth highlighting
    > > > that this hunk means we are now out of GFP bits.
    > >
    > > Well ugh. What are we to do about that?
    >
    > Can we simply give these AS_ flags their own word in mapping rather than
    > squash them together with gfp flags and impose the restriction on the
    > number of gfp flags. There was some demand for new gfp flags already and
    > mapping flags were in the way.

    OK, it seems this got unnoticed. What do you think about the following
    two patches? I have only compile tested them and git grep suggests
    nobody else should be relying on storing gfp_mask into flags directly.
    So either I my grep-foo fools me or this should be safe. The two patches
    will come as a reply to this email.

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