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

[Laurent Pinchart]

Hi Arnd,

On Friday, 16 March 2018 10:25:25 EET Arnd Bergmann wrote:
> 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 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
> 
> Yes, that works and looks much better than my version.

Thank you for your patch, and sorry for breaking the build. Do you plan to 
submit a new version based on Frank's approach ?

-- 
Regards,

Laurent Pinchart