linux-kernel - Re: undefined reference to `node

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Message-ID: <Yjs0ausRy6/mLUFD@dhcp22.suse.cz>
Date:   Wed, 23 Mar 2022 15:53:30 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Oscar Salvador <osalvador@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: undefined reference to `node_data'

On Wed 23-03-22 20:58:10, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   6b1f86f8e9c7f9de7ca1cb987b2cf25e99b1ae3a
> commit: 09f49dca570a917a8c6bccd7e8c61f5141534e3a mm: handle uninitialized numa nodes gracefully
> date:   14 hours ago
> config: mips-buildonly-randconfig-r004-20220323 (https://download.01.org/0day-ci/archive/20220323/202203232042.AS9SV1zv-lkp@intel.com/config)
> compiler: mips64-linux-gcc (GCC) 11.2.0
> 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=09f49dca570a917a8c6bccd7e8c61f5141534e3a
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout 09f49dca570a917a8c6bccd7e8c61f5141534e3a
>         # save the config file to linux build tree
>         mkdir build_dir
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=mips SHELL=/bin/bash

Didn't work for me
> 
> 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 >>):
> 
>    mips64-linux-ld: mm/page_alloc.o: in function `free_area_init':
> >> (.init.text+0x1680): undefined reference to `node_data'
>    mips64-linux-ld: (.init.text+0x1690): undefined reference to `node_data'

OK, I can see what is going here. The page allocator normally
uses NODE_DATA but arch_refresh_nodedata refers to node_data directly.
This is a problem with
arch/mips/include/asm/mach-loongson64/mmzone.h:
extern struct pglist_data *__node_data[];

#define NODE_DATA(n)            (__node_data[n])

Unfortunately we cannot use NODE_DATA there because of header inclusion
ordering. I will think about a solution.

Thanks for the report
-- 
Michal Hocko
SUSE Labs