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

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Date:   Wed, 21 Mar 2018 11:58:57 +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 Wednesday, 21 March 2018 09:38:35 EET Arnd Bergmann wrote:
> On Tue, Mar 20, 2018 at 9:15 PM, Laurent Pinchart wrote:
> > 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 ?
> 
> I'm currently at Linaro Connect and won't be able to send a tested patch
> before mid next week. If you want it earlier, feel free to apply that patch
> with my original description and 'Reported-by: Arnd Bergmann
> <arnd@...db.de>'.

I was about to do so, but realized I can't reproduce the problem here. If you 
don't mind I'll let you submit a v2. Alternatively I can work on it if you 
give me instruction to reproduce the issue.

-- 
Regards,

Laurent Pinchart