linux-kernel - Re: [kbuild-all] Re: powerpc-linux-objdump: Warning: Unrecognized form: 0x23

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Date:   Thu, 1 Sep 2022 13:52:42 +0800
From:   "Chen, Rong A" <rong.a.chen@...el.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Nathan Chancellor <nathan@...nel.org>
Cc:     kernel test robot <lkp@...el.com>,
        Kees Cook <keescook@...omium.org>,
        "llvm@...ts.linux.dev" <llvm@...ts.linux.dev>,
        "kbuild-all@...ts.01.org" <kbuild-all@...ts.01.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [kbuild-all] Re: powerpc-linux-objdump: Warning: Unrecognized
 form: 0x23



On 9/1/2022 1:45 PM, Christophe Leroy wrote:
> 
> 
> Le 01/09/2022 à 06:59, Chen, Rong A a écrit :
>>
>>
>> On 9/1/2022 10:03 AM, Nathan Chancellor wrote:
>>> Hi Rong,
>>>
>>> On Thu, Sep 01, 2022 at 09:15:58AM +0800, Chen, Rong A wrote:
>>>>
>>>>
>>>> On 8/31/2022 11:40 PM, Nathan Chancellor wrote:
>>>>> On Wed, Aug 31, 2022 at 02:52:36PM +0800, kernel test robot wrote:
>>>>>> tree:
>>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>>>>> master
>>>>>> head:   dcf8e5633e2e69ad60b730ab5905608b756a032f
>>>>>> commit: f9b3cd24578401e7a392974b3353277286e49cee Kconfig.debug:
>>>>>> make DEBUG_INFO selectable from a choice
>>>>>> date:   5 months ago
>>>>>> config: powerpc-buildonly-randconfig-r003-20220830
>>>>>> (https://download.01.org/0day-ci/archive/20220831/202208311414.4OPuYS9K-lkp@intel.com/config)
>>>>>> compiler: clang version 16.0.0
>>>>>> (https://github.com/llvm/llvm-project
>>>>>> c7df82e4693c19e3fd2e25c83eb04d9deb7b7b59)
>>>>>> reproduce (this is a W=1 build):
>>>>>>            wget
>>>>>> https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>>>>>            chmod +x ~/bin/make.cross
>>>>>>            # install powerpc cross compiling tool for clang build
>>>>>>            # apt-get install binutils-powerpc-linux-gnu
>>>>>>            #
>>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f9b3cd24578401e7a392974b3353277286e49cee
>>>>>>            git remote add linus
>>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>>>>>            git fetch --no-tags linus master
>>>>>>            git checkout f9b3cd24578401e7a392974b3353277286e49cee
>>>>>>            # save the config file
>>>>>>            mkdir build_dir && cp config build_dir/.config
>>>>>>            COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang
>>>>>> make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash
>>>>>>
>>>>>> If you fix the issue, kindly add following tag where applicable
>>>>>> Reported-by: kernel test robot <lkp@...el.com>
>>>>>>
>>>>>> All warnings (new ones prefixed by >>):
>>>>>>
>>>>>>>> powerpc-linux-objdump: Warning: Unrecognized form: 0x23
>>>>>
>>>>> Given this is clang 16.0.0 with
>>>>> CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y, which uses DWARF5 by
>>>>> default instead of DWARF4, it looks like older binutils not
>>>>> understanding DWARF5. What version of binutils is being used by the
>>>>> bot?
>>>>
>>>> Hi Nathan,
>>>>
>>>> We're using binutils v2.38.90.20220713-2
>>>>
>>>> ||/ Name           Version            Architecture Description
>>>> +++-==============-==================-============-==========================================
>>>> ii  binutils       2.38.90.20220713-2 amd64        GNU assembler,
>>>> linker and binary utilities
>>>
>>> Thanks for chiming in! This looks like the output of 'dpkg -l', right? I
>>
>> Hi Nathan,
>>
>> oh, yes, I misunderstood, it's not related to this package.
>>
>>> noticed on second glance that the tuple for the objdump warning above is
>>> 'powerpc-linux-', which leads me to believe that a kernel.org toolchain
>>> (or a self compiled one) is being used. I would expect the tuple to be
>>> 'powerpc-linux-gnu-' if Debian's package was being used. Is that
>>> possible?
>>
>> you are right, we used a self-compiled toolchain, we'll try the binutils
>> from debian package.
> 
> Can you first tell us the version you are using ?
> 
> 	powerpc-linux-objdump -v
> 
> That will tell you the version.

Hi Christophe,

the version is v2.38:

$ ./powerpc-linux-objdump -v
GNU objdump (GNU Binutils) 2.38
Copyright (C) 2022 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) any later 
version.
This program has absolutely no warranty.

Best Regards,
Rong Chen

> 
> Thanks
> Christophe
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