linux-kernel - Re: [PATCH 05/22] mm: export alloc_pages

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Date:   Tue, 25 Jun 2019 09:23:17 +0200
From:   Christoph Hellwig <hch@....de>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Michal Hocko <mhocko@...nel.org>, Christoph Hellwig <hch@....de>,
        Jérôme Glisse <jglisse@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Ben Skeggs <bskeggs@...hat.com>, Linux MM <linux-mm@...ck.org>,
        nouveau@...ts.freedesktop.org,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        linux-pci@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 05/22] mm: export alloc_pages_vma

On Mon, Jun 24, 2019 at 11:24:48AM -0700, Dan Williams wrote:
> I asked for this simply because it was not exported historically. In
> general I want to establish explicit export-type criteria so the
> community can spend less time debating when to use EXPORT_SYMBOL_GPL
> [1].
> 
> The thought in this instance is that it is not historically exported
> to modules and it is safer from a maintenance perspective to start
> with GPL-only for new symbols in case we don't want to maintain that
> interface long-term for out-of-tree modules.
> 
> Yes, we always reserve the right to remove / change interfaces
> regardless of the export type, but history has shown that external
> pressure to keep an interface stable (contrary to
> Documentation/process/stable-api-nonsense.rst) tends to be less for
> GPL-only exports.

Fully agreed.  In the end the decision is with the MM maintainers,
though, although I'd prefer to keep it as in this series.