linux-kernel - Re: [PATCH v2 03/12] of: overlay: rename identifiers to more reflect what they do

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Date:   Tue, 17 Oct 2017 09:38:26 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Frank Rowand <frowand.list@...il.com>
Cc:     Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        David Airlie <airlied@...ux.ie>, Jyri Sarha <jsarha@...com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v2 03/12] of: overlay: rename identifiers to more reflect
 what they do

On Mon, Oct 16, 2017 at 8:17 PM,  <frowand.list@...il.com> wrote:
> From: Frank Rowand <frank.rowand@...y.com>
>
> This patch is aimed primarily at drivers/of/overlay.c, but those
> changes also have a small impact in a few other files.
>
> overlay.c is difficult to read and maintain.  Improve readability:
>   - Rename functions, types and variables to better reflect what
>     they do and to be consistent with names in other places,
>     such as the device tree overlay FDT (flattened device tree),
>     and make the algorithms more clear
>   - Use the same names consistently throughout the file
>   - Update comments for name changes
>   - Fix incorrect comments
>
> This patch is intended to not introduce any functional change.
>
> Signed-off-by: Frank Rowand <frank.rowand@...y.com>
> ---
>  Documentation/devicetree/overlay-notes.txt   |  12 +-
>  drivers/gpu/drm/tilcdc/tilcdc_slave_compat.c |   5 +-
>  drivers/of/dynamic.c                         |   2 +-
>  drivers/of/overlay.c                         | 506 ++++++++++++++-------------
>  drivers/of/unittest.c                        |  20 +-
>  include/linux/of.h                           |  12 +-
>  6 files changed, 294 insertions(+), 263 deletions(-)

Doesn't build:

../drivers/of/overlay.c:397:41: warning: ‘struct of_overlay_info’
declared inside parameter list will not be visible outside of this
definition or declaration
   struct device_node *info_node, struct of_overlay_info *ovinfo)
                                         ^~~~~~~~~~~~~~~
../drivers/of/overlay.c:396:40: warning: ‘struct of_overlay’ declared
inside parameter list will not be visible outside of this definition
or declaration
 static int of_fill_overlay_info(struct of_overlay *ov,
                                        ^~~~~~~~~~
../drivers/of/overlay.c: In function ‘of_fill_overlay_info’:
../drivers/of/overlay.c:399:8: error: dereferencing pointer to
incomplete type ‘struct of_overlay_info’
  ovinfo->overlay = of_get_child_by_name(info_node, "__overlay__");
        ^~
../drivers/of/overlay.c: In function ‘init_overlay_changeset’:
../drivers/of/overlay.c:450:30: error: passing argument 1 of
‘of_fill_overlay_info’ from incompatible pointer type
[-Werror=incompatible-pointer-types]
   ret = of_fill_overlay_info(ovcs, node, &fragments[cnt]);
                              ^~~~
../drivers/of/overlay.c:396:12: note: expected ‘struct of_overlay *’
but argument is of type ‘struct overlay_changeset *’
 static int of_fill_overlay_info(struct of_overlay *ov,
            ^~~~~~~~~~~~~~~~~~~~
../drivers/of/overlay.c:450:42: error: passing argument 3 of
‘of_fill_overlay_info’ from incompatible pointer type
[-Werror=incompatible-pointer-types]
   ret = of_fill_overlay_info(ovcs, node, &fragments[cnt]);
                                          ^
../drivers/of/overlay.c:396:12: note: expected ‘struct of_overlay_info
*’ but argument is of type ‘struct fragment *’
 static int of_fill_overlay_info(struct of_overlay *ov,
            ^~~~~~~~~~~~~~~~~~~~


I could have messed something up as every commit so far conflicts with
"of: overlay: fix memory leak related to duplicated property". Can you
rebase on to my dt/next branch too.

Rob