linux-kernel - Re: [PATCH 08/25] memremap: move dev_pagemap callbacks into a separate structure

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Date:   Mon, 17 Jun 2019 21:55:26 +0200
From:   Christoph Hellwig <hch@....de>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     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>,
        Logan Gunthorpe <logang@...tatee.com>
Subject: Re: [PATCH 08/25] memremap: move dev_pagemap callbacks into a
 separate structure

On Mon, Jun 17, 2019 at 10:51:35AM -0700, Dan Williams wrote:
> > -       struct dev_pagemap *pgmap = _pgmap;
> 
> Whoops, needed to keep this line to avoid:
> 
> tools/testing/nvdimm/test/iomap.c:109:11: error: ‘pgmap’ undeclared
> (first use in this function); did you mean ‘_pgmap’?

So I really shouldn't be tripping over this anymore, but can we somehow
this mess?

 - at least add it to the normal build system and kconfig deps instead
   of stashing it away so that things like buildbot can build it?
 - at least allow building it (under COMPILE_TEST) if needed even when
   pmem.ko and friends are built in the kernel?