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

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Message-ID: <85498c30-6151-de0e-1647-fdb41b4b3320@infradead.org>
Date:   Tue, 3 Aug 2021 22:46:09 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        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'

On 8/3/21 10:31 PM, Christophe Leroy wrote:
> 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/ ?

Hi Christophe,

Yes, that builds without a problem. Thanks for the pointer.

Acked-by: Randy Dunlap <rdunlap@...radead.org> # build-tested

-- 
~Randy