linux-kernel - Re: undefined reference to `.radix__create_section

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Message-ID: <c4398495-a50a-a749-6679-7510ed862db2@csgroup.eu>
Date:   Wed, 4 Aug 2021 07:31:36 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Randy Dunlap <rdunlap@...radead.org>,
        kernel test robot <lkp@...el.com>,
        Jordan Niethe <jniethe5@...il.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: undefined reference to `.radix__create_section_mapping'

Hi Randy,

Le 04/08/2021 à 04:40, Randy Dunlap a écrit :
> On 7/31/21 11:22 AM, kernel test robot wrote:
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   c7d102232649226a69dddd58a4942cf13cff4f7c
>> commit: fe3dc333d2ed50c9764d281869d87bae0d795ce5 powerpc/mmu: Don't duplicate radix_enabled()
>> date:   3 months ago
>> config: powerpc64-randconfig-r013-20210731 (attached as .config)
>> compiler: powerpc-linux-gcc (GCC) 10.3.0
>> 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
>>          # 
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fe3dc333d2ed50c9764d281869d87bae0d795ce5 
>>
>>          git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>          git fetch --no-tags linus master
>>          git checkout fe3dc333d2ed50c9764d281869d87bae0d795ce5
>>          # save the attached .config to linux build tree
>>          mkdir build_dir
>>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=powerpc 
>> SHELL=/bin/bash
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kernel test robot <lkp@...el.com>
>>
>> All errors (new ones prefixed by >>):
>>
>>     powerpc-linux-ld: arch/powerpc/mm/book3s64/pgtable.o: in function `.create_section_mapping':
>>>> (.meminit.text+0x3c): undefined reference to `.radix__create_section_mapping'
>>     powerpc-linux-ld: arch/powerpc/mm/book3s64/pgtable.o: in function `.remove_section_mapping':
>>>> (.meminit.text+0x90): undefined reference to `.radix__remove_section_mapping'
> 
> In the randconfig file:
> # CONFIG_PPC_RADIX_MMU is not set
> 
> It is default y, but maybe that is not strong enough?
> I.e., should it be selected by PPC_BOOK3S_64?
> 
> Changing the config to PPC_RADIX_MMU=y fixes the build errors.
> 
> Or should arch/powerpc/mm/book3s64/pgtable.c be modified to handle
> the case of PPC_RADIX_MMU is not set?
> 

Can you test 
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/20210804013724.514468-1-jniethe5@gmail.com/ ?

Thanks
Christophe