linux-kernel - Re: [kbuild-all] Re: undefined reference to `node

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Message-ID: <a80b2c1f-cbb9-b320-3e97-0152109d261f@loongson.cn>
Date:   Fri, 25 Mar 2022 11:40:37 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     "Chen, Rong A" <rong.a.chen@...el.com>,
        Michal Hocko <mhocko@...e.com>,
        kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     linux-kernel@...r.kernel.org, Oscar Salvador <osalvador@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        linux-mips@...r.kernel.org, chenfeiyang@...ngson.cn
Subject: Re: [kbuild-all] Re: undefined reference to `node_data'



On 03/25/2022 09:16 AM, Chen, Rong A wrote:
>
>
> On 3/24/2022 8:40 PM, Michal Hocko wrote:
>> On Thu 24-03-22 10:04:43, Thomas Bogendoerfer wrote:
>>> On Wed, Mar 23, 2022 at 05:46:59PM +0100, Michal Hocko wrote:
>>>>>> 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.
>>>>
>>>> Is there any reason why (some?) MIPS arches use __node_data rather than
>>>> node_data as most other architectures? Would it be acceptable to do the
>>>> renaming? It would help to cover the above compilation problem because
>>>> arch_refresh_nodedata could keep using node_data directly.
>>>
>>> I've just checked history and I don't see a reason for __node_data.
>>> So I'm fine with changing it to node_data.
>>
>> Thanks a lot for double checking Thomas! This is a dump&simple sed over
>> mips file. 0-day guys, could you give it a try please?
>
>
> Hi Michal,
>
> It returns another error:

Hi,

I think the following patch should fix the build error
"undefined reference to `node_data'":

https://git.kernel.org/pub/scm/linux/kernel/git/mips/linux.git/commit/?id=f8f9f21c7848

Thanks,
Tiezhu