linux-kernel - Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging

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Date:   Mon, 6 Mar 2017 11:40:41 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Laura Abbott <labbott@...hat.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Riley Andrews <riandrews@...roid.com>, arve@...roid.com,
        romlem@...gle.com, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Brian Starkey <brian.starkey@....com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Mark Brown <broonie@...nel.org>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        linux-mm@...ck.org
Subject: Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of
 staging

On Mon, Mar 06, 2017 at 08:42:59AM +0100, Michal Hocko wrote:
> On Fri 03-03-17 09:37:55, Laura Abbott wrote:
> > On 03/03/2017 05:29 AM, Michal Hocko wrote:
> > > On Thu 02-03-17 13:44:32, Laura Abbott wrote:
> > >> Hi,
> > >>
> > >> There's been some recent discussions[1] about Ion-like frameworks. There's
> > >> apparently interest in just keeping Ion since it works reasonablly well.
> > >> This series does what should be the final clean ups for it to possibly be
> > >> moved out of staging.
> > >>
> > >> This includes the following:
> > >> - Some general clean up and removal of features that never got a lot of use
> > >>   as far as I can tell.
> > >> - Fixing up the caching. This is the series I proposed back in December[2]
> > >>   but never heard any feedback on. It will certainly break existing
> > >>   applications that rely on the implicit caching. I'd rather make an effort
> > >>   to move to a model that isn't going directly against the establishement
> > >>   though.
> > >> - Fixing up the platform support. The devicetree approach was never well
> > >>   recieved by DT maintainers. The proposal here is to think of Ion less as
> > >>   specifying requirements and more of a framework for exposing memory to
> > >>   userspace.
> > >> - CMA allocations now happen without the need of a dummy device structure.
> > >>   This fixes a bunch of the reasons why I attempted to add devicetree
> > >>   support before.
> > >>
> > >> I've had problems getting feedback in the past so if I don't hear any major
> > >> objections I'm going to send out with the RFC dropped to be picked up.
> > >> The only reason there isn't a patch to come out of staging is to discuss any
> > >> other changes to the ABI people might want. Once this comes out of staging,
> > >> I really don't want to mess with the ABI.
> > > 
> > > Could you recapitulate concerns preventing the code being merged
> > > normally rather than through the staging tree and how they were
> > > addressed?
> > > 
> > 
> > Sorry, I'm really not understanding your question here, can you
> > clarify?
> 
> There must have been a reason why this code ended up in the staging
> tree, right? So my question is what those reasons were and how they were
> handled in order to move the code from the staging subtree.

No one gave a thing about android in upstream, so Greg KH just dumped it
all into staging/android/. We've discussed ION a bunch of times, recorded
anything we'd like to fix in staging/android/TODO, and Laura's patch
series here addresses a big chunk of that.

This is pretty much the same approach we (gpu folks) used to de-stage the
syncpt stuff.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch