linux-kernel - Re: [RFC PATCH v2 1/4] scripts: Add script to generate dtb build information

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Date:   Mon, 24 Feb 2020 08:59:36 +1100
From:   David Gibson <david@...son.dropbear.id.au>
To:     Frank Rowand <frowand.list@...il.com>
Cc:     Alexandre Torgue <alexandre.torgue@...com>, robh+dt@...nel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>, sjg@...omium.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org, devicetree-compiler@...r.kernel.org,
        Ian Lepore <ian@...ebsd.org>
Subject: Re: [RFC PATCH v2 1/4] scripts: Add script to generate dtb build
 information

On Fri, Feb 21, 2020 at 11:52:34AM -0600, Frank Rowand wrote:
> On 2/21/20 10:14 AM, Alexandre Torgue wrote:
> > This commit adds a new script to create a file (in dts file directory) with
> > some information (date, Linux version, user). This file could then be used
> > to populate "build-info" property in every dts file that would use this
> > build information:
> > 
> > Example:
> > 
> > / {
> > 	...
> > 	build-info = /incbin/("dtb-build.txt");
> 
> s/.txt/.dtsi/

I don't think that makes sense.  This is an /incbin/ not an /include/
so the text file is *not* dts information.

> and same wherever the file name is used.
> 
> 
> > 	...
> > };
> > 
> > Signed-off-by: Alexandre Torgue <alexandre.torgue@...com>
> > 
> > diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> > index bae62549e3d2..a5af84ef4ffc 100644
> > --- a/scripts/Makefile.lib
> > +++ b/scripts/Makefile.lib
> > @@ -246,6 +246,7 @@ quiet_cmd_gzip = GZIP    $@
> >  # DTC
> >  # ---------------------------------------------------------------------------
> >  DTC ?= $(objtree)/scripts/dtc/dtc
> > +DTB_GEN_INFO ?= $(objtree)/scripts/gen_dtb_build_info.sh
> >  
> >  # Disable noisy checks by default
> >  ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
> > @@ -286,6 +287,7 @@ $(obj)/%.dtb.S: $(obj)/%.dtb FORCE
> >  
> >  quiet_cmd_dtc = DTC     $@
> >  cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
> > +	$(DTB_GEN_INFO) $(src) ; \
> >  	$(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
> >  	$(DTC) -O $(2) -o $@ -b 0 \
> >  		$(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
> > diff --git a/scripts/gen_dtb_build_info.sh b/scripts/gen_dtb_build_info.sh
> > new file mode 100755
> > index 000000000000..0cd8bd98e410
> > --- /dev/null
> > +++ b/scripts/gen_dtb_build_info.sh
> > @@ -0,0 +1,10 @@
> > +#!/bin/bash
> > +# SPDX-License-Identifier: GPL-2.0
> > +
> > +set -o nounset
> > +
> > +DTB_DIR=$1
> > +DTB_COMPILE_BY=$(whoami | sed 's/\\/\\\\/')
> > +DTB_INFO="From Linux $KERNELRELEASE by $DTB_COMPILE_BY the $(date).\0"
> 
> I would remove the filler words "From", "by", "the", and the trailing
> period ('.').
> 
> <bikeshed>
> You might consider using a format more like the Linux
> kernel version line, which puts parenthesis around the
> compiled by info.
> </bikeshed>
> 
> -Frank
> 
> > +
> > +printf "$DTB_INFO" > "$DTB_DIR/dtb-build.txt"
> > 
> 

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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