linux-kernel - Re: [PATCH 5/5] mm, hmm: mark hmm_devmem_{add, add_resource} EXPORT_SYMBOL

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Message-ID: <20180522063236.GE7925@lst.de>
Date:   Tue, 22 May 2018 08:32:36 +0200
From:   Christoph Hellwig <hch@....de>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     akpm@...ux-foundation.org, Christoph Hellwig <hch@....de>,
        Jérôme Glisse <jglisse@...hat.com>,
        Logan Gunthorpe <logang@...tatee.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] mm, hmm: mark hmm_devmem_{add, add_resource}
        EXPORT_SYMBOL_GPL

On Mon, May 21, 2018 at 03:35:40PM -0700, Dan Williams wrote:
> The routines hmm_devmem_add(), and hmm_devmem_add_resource() are small
> wrappers around devm_memremap_pages(). The devm_memremap_pages()
> interface is a subset of the hmm functionality which has more and deeper
> ties into the kernel memory management implementation. It was an
> oversight that these symbols were not marked EXPORT_SYMBOL_GPL from the
> outset due to how they originally copied (and now reuse)
> devm_memremap_pages().

If we end up keeping this code: absolutely.  Then again I think without
an actual user this should have never been merged, and should be removed
until one shows up.

Reviewed-by: Christoph Hellwig <hch@....de>