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

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Date:   Tue, 3 Aug 2021 19:40:09 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     kernel test robot <lkp@...el.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: undefined reference to `.radix__create_section_mapping'

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?


thanks.
-- 
~Randy