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

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Date:   Fri, 16 Mar 2018 09:25:25 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Frank.Rowand@...y.com
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.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

On Fri, Mar 16, 2018 at 2:39 AM,  <Frank.Rowand@...y.com> wrote:
> On Thursday, March 15, 2018 8:37 AM, Arnd Bergmann [mailto:arnd@...db.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

Yes, that works and looks much better than my version.

      Arnd