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

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Message-Id: <d1cea9bd-feab-86f0-d76c-8df812848c0a@linux.vnet.ibm.com>
Date:   Fri, 10 Mar 2017 17:41:14 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     Ye Xiaolong <xiaolong.ye@...el.com>,
        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 03/10/2017 06:42 AM, Ye Xiaolong wrote:
> 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.

If CONFIG_MIGRATION is not set then mm/migrate.c never gets compiled
and the symbol 'mt_page_copy' is never exported for kernel/sysctl.c
based extern variable to use. Sure, will fix it by keeping all the
code in kernel/sysctl.c within CONFIG_MIGRATION config. Thanks for
pointing it out.