linux-kernel - Re: [kbuild-all] [PATCH 6/6] sysctl: Add global tunable mt_page_copy

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Date:   Fri, 10 Mar 2017 09:12:39 +0800
From:   Ye Xiaolong <xiaolong.ye@...el.com>
To:     Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Cc:     kbuild test robot <lkp@...el.com>, haren@...ux.vnet.ibm.com,
        mhocko@...e.com, srikar@...ux.vnet.ibm.com, minchan@...nel.org,
        aneesh.kumar@...ux.vnet.ibm.com, bsingharora@...il.com,
        dave.hansen@...el.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, jglisse@...hat.com, mgorman@...e.de,
        dan.j.williams@...el.com, zi.yan@...rutgers.edu, vbabka@...e.cz,
        kbuild-all@...org
Subject: Re: [kbuild-all] [PATCH 6/6] sysctl: Add global tunable mt_page_copy

On 03/08, Anshuman Khandual wrote:
>On 02/17/2017 09:00 PM, kbuild test robot wrote:
>> Hi Zi,
>> 
>> [auto build test ERROR on linus/master]
>> [also build test ERROR on v4.10-rc8 next-20170217]
>> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>> 
>> url:    https://github.com/0day-ci/linux/commits/Anshuman-Khandual/Enable-parallel-page-migration/20170217-200523
>> config: i386-randconfig-a0-02131010 (attached as .config)
>> compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
>
>Though I dont have the same compiler, I am unable to reproduce this
>build failure exactly. The build fails but for a different symbol.

I think previous "undefined reference to `mt_page_copy'" error is due to kbuild
bot didn't set CONFIG_MIGRATION (see attached config in original mail) since it
is a randconfig test.

Thanks,
Xiaolong

>I have the following gcc version but does it really make a
>difference with respect to finding the symbol etc ?
>
>gcc (Ubuntu 4.9.2-10ubuntu13) 4.9.2
>
>
>mm/memory.c: In function ‘copy_pmd_range’:
>mm/memory.c:1002:3: error: implicit declaration of function
>‘pmd_related’ [-Werror=implicit-function-declaration]
>   if (pmd_related(*src_pmd)) {
>   ^
>cc1: some warnings being treated as errors
>scripts/Makefile.build:294: recipe for target 'mm/memory.o' failed
>
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>kbuild-all@...ts.01.org
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