linux-kernel - Re: [PATCH] Replace use of perl with sed and tr in s390x build.

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Message-ID: <91e7a6bd-847b-3cbc-9ebf-b73921d456f0@landley.net>
Date:   Tue, 1 Jun 2021 13:19:35 -0500
From:   Rob Landley <rob@...dley.net>
To:     Vasily Gorbik <gor@...ux.ibm.com>
Cc:     Heiko Carstens <hca@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Alexander Egorenkov <egorenar@...ux.ibm.com>,
        Philipp Rudo <prudo@...ux.ibm.com>, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Replace use of perl with sed and tr in s390x build.

On 5/31/21 4:55 PM, Vasily Gorbik wrote:
> On Mon, May 17, 2021 at 11:46:44PM -0500, Rob Landley wrote:
>> From: Rob Landley <rob@...dley.net>
>>
>> Commit 246218962e21 in November added a perl dependency to the s390x vmlinux
>> build, complicating the "countering trusting trust" build approach ala
>> http://lists.landley.net/pipermail/toybox-landley.net/2020-July/011898.html
>>
>> Signed-off-by: Rob Landley <rob@...dley.net>
>> ---
>>
>>  arch/s390/boot/compressed/Makefile |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/s390/boot/compressed/Makefile b/arch/s390/boot/compressed/Makefile
>> index de18dab518bb..e941b165bd4f 100644
>> --- a/arch/s390/boot/compressed/Makefile
>> +++ b/arch/s390/boot/compressed/Makefile
>> @@ -33,7 +33,7 @@ $(obj)/vmlinux.syms: $(obj)/vmlinux.lds $(objtree)/arch/s390/boot/startup.a $(OB
>>  
>>  quiet_cmd_dumpsyms = DUMPSYMS $<
>>  define cmd_dumpsyms
>> -	$(NM) -n -S --format=bsd "$<" | $(PERL) -ne '/(\w+)\s+(\w+)\s+[tT]\s+(\w+)/ and printf "%x %x %s\0",hex $$1,hex $$2,$$3' > "$@"
>> +	$(NM) -n -S --format=bsd "$<" | sed -nE 's/^0*([0-9a-fA-F]+) 0*([0-9a-fA-F]+) [tT] ([^ ]*)$$/\1 \2 \3/p' | tr '\n' '\0' > "$@"
>>  endef
> 
> The change itself is fine. Yields the same result as before with
> binutils/llvm/elfutils versions of nm.

...

> So, would you mind if I pick your patch changing the commit message
> like the following?
> """
> s390/decompressor: replace use of perl with simple sed/tr
> 
> Use simple sed/tr instead of perl to generate decompressor symbols
> file with the same result.

Works for me.

> Signed-off-by: Rob Landley <rob@...dley.net>
> """

Thanks,

Rob