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

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Date:   Sun, 23 Feb 2020 18:57:25 -0600
From:   Frank Rowand <frowand.list@...il.com>
To:     David Gibson <david@...son.dropbear.id.au>
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 2/23/20 3:59 PM, David Gibson wrote:
> 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.

You are right, thanks for catching that.

-Frank

> 
>> 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"
>>>
>>
>