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

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Message-Id: <fa0c0260-9b98-42fc-9268-6f0b9c9ff592@linux.vnet.ibm.com>
Date:   Wed, 8 Mar 2017 21:07:17 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     kbuild test robot <lkp@...el.com>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, mhocko@...e.com, vbabka@...e.cz,
        mgorman@...e.de, minchan@...nel.org,
        aneesh.kumar@...ux.vnet.ibm.com, bsingharora@...il.com,
        srikar@...ux.vnet.ibm.com, haren@...ux.vnet.ibm.com,
        jglisse@...hat.com, dave.hansen@...el.com,
        dan.j.williams@...el.com, zi.yan@...rutgers.edu
Subject: Re: [PATCH 6/6] sysctl: Add global tunable mt_page_copy

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 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