linux-kernel - Re: [PATCH V11 3/5] kbuild: Allow .dtso format for overlay source files

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Message-ID: <20210315064051.otcjt3x6vkfdrio6@vireshk-i7>
Date:   Mon, 15 Mar 2021 12:10:51 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Frank Rowand <frowand.list@...il.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        David Gibson <david@...son.dropbear.id.au>,
        Michal Simek <michal.simek@...inx.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Anmar Oueja <anmar.oueja@...aro.org>,
        Bill Mills <bill.mills@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V11 3/5] kbuild: Allow .dtso format for overlay source
 files

On 14-03-21, 20:16, Frank Rowand wrote:
> On 3/12/21 11:11 PM, Frank Rowand wrote:
> > On 3/12/21 1:13 AM, Viresh Kumar wrote:
> >> On 12-03-21, 01:09, Frank Rowand wrote:
> >>> I suggested having the .dtso files include the .dts file because that is a relatively
> >>> small and easy change to test.  What would probably make more sense is the rename
> >>> the existing overlay .dts files to be .dtso files and then for each overlay .dtso
> >>> file create a new .dts file that #includes the corresponding .dtso file.  This is
> >>> more work and churn, but easier to document that the .dts files are a hack that is
> >>> needed so that the corresponding .dtb.S files will be generated.
> >>
> >> What about creating links instead then ?
> >>
> > 
> > I don't really like the idea of using links here.
> > 
> > Maybe it is best to make the changes needed to allow the unittest
> > overlays to be .dtso instead of .dts.
> > 
> > Off the top of my head:
> > 
> >   scripts/Makefile.lib:
> >      The rule for %.dtb.S invokes cmd_dt_S_dtb, which puts the
> >      overlay data in section .dtb.init.rodata, with a label
> >      pointing to the beginning of the overlay __dtb_XXX_begin and
> >      a label pointing to the end of the overlay __dtb_XXX_end,
> >      for the overlay named XXX.  I _think_ that you could simply
> >      add a corresponding rule for %.dtbo.S using a new command
> >      cmd_dt_S_dtbo (the same as cmd_dt_S_dtb, except use labels
> >      __dtbo_XXX_begin and __dtbo_XXX_end).
> 
> If you do the above, please put it in drivers/of/unittest-data/Makefile
> instead of scripts/Makefile.lib because it is unittest.c specific and
> not meant to be anywhere else in the kernel.

What about doing this then in unittest's Makefile instead (which I
already suggested earlier), that will make everything work just fine
without any other changes ?

+# Required for of unittest files as they can't be renamed to .dtso
+$(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE
+       $(call if_changed_dep,dtc)

-- 
viresh