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

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Date:   Tue, 20 Mar 2018 15:15:37 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Frank.Rowand@...y.com, David Airlie <airlied@...ux.ie>,
        niklas.soderlund+renesas@...natech.se,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Frank Rowand <frowand.list@...il.com>
Subject: Re: [PATCH] [RFC] drm: rcar-du: keep temporary dtb files around during build

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@...y.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