[PATCH] [RFC] drm: rcar-du: keep temporary dtb files around during build

[Frank Rowand]

Hi Geert,

On 03/22/18 07:26, Geert Uytterhoeven wrote:
> Hi Frank,
> 
> On Fri, Mar 16, 2018 at 2:39 AM,  <Frank.Rowand at sony.com> wrote:
>> On Thursday, March 15, 2018 8:37 AM, Arnd Bergmann [mailto:arnd at arndb.de]  wrote:
>>>
>>> The *.dtb and *.dtb.S files get removed by 'make' during the build
>>> process,
>>> and later seem to be missed during the 'modpost' stage:
>>>
>>> rm drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7795.dtb
>>> drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7791.dtb
>>> drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7791.dtb.S
>>> drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7795.dtb.S
>>> drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7790.dtb.S
>>> drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7793.dtb
>>> drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7796.dtb
>>> drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7790.dtb
>>> drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7796.dtb.S
>>> drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7793.dtb.S
>>> WARNING: could not open
>>> drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7790.dtb.S: No such file or
>>> directory
>>>
>>> As a workaround, this adds all those files to the 'extra-y' target list,
>>> but that's really ugly. Any ideas for a better fix?
>>
>> Does this work for you (untested, but the way it is done in
>> drivers/of/unittest-data/Makefile):
>>
>> .PRECIOUS: \
>>         $(obj)/%.dtb.S \
>>         $(obj)/%.dtb
> 
> Shouldn't that just be moved to scripts/Makefile.lib, just above the rule
> to make dtb.S, like is done for other precious objects?
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 

Thank you for adding Yamada-san (later in this thread).

I acked his patch series that does what you suggest.

-Frank