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

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Date:   Mon, 17 Jun 2019 10:51:35 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Christoph Hellwig <hch@....de>
Cc:     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 5:27 AM Christoph Hellwig <hch@....de> wrote:
>
> The dev_pagemap is a growing too many callbacks.  Move them into a
> separate ops structure so that they are not duplicated for multiple
> instances, and an attacker can't easily overwrite them.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> Reviewed-by: Logan Gunthorpe <logang@...tatee.com>
> Reviewed-by: Jason Gunthorpe <jgg@...lanox.com>
> ---
>  drivers/dax/device.c              | 11 ++++++----
>  drivers/dax/pmem/core.c           |  2 +-
>  drivers/nvdimm/pmem.c             | 19 +++++++++-------
>  drivers/pci/p2pdma.c              |  9 +++++---
>  include/linux/memremap.h          | 36 +++++++++++++++++--------------
>  kernel/memremap.c                 | 18 ++++++++--------
>  mm/hmm.c                          | 10 ++++++---
>  tools/testing/nvdimm/test/iomap.c |  9 ++++----
>  8 files changed, 65 insertions(+), 49 deletions(-)
>
[..]
> diff --git a/tools/testing/nvdimm/test/iomap.c b/tools/testing/nvdimm/test/iomap.c
> index 219dd0a1cb08..a667d974155e 100644
> --- a/tools/testing/nvdimm/test/iomap.c
> +++ b/tools/testing/nvdimm/test/iomap.c
> @@ -106,11 +106,10 @@ EXPORT_SYMBOL(__wrap_devm_memremap);
>
>  static void nfit_test_kill(void *_pgmap)
>  {
> -       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’?