linux-kernel - Re: [PATCH v6] mm/page_owner.c: add llseek for page

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Date:   Thu, 11 Aug 2022 11:40:33 +0200
From:   "Vlastimil Babka (SUSE)" <vbabka@...nel.org>
To:     Kassey Li <quic_yingangl@...cinc.com>,
        kernel test robot <lkp@...el.com>, akpm@...ux-foundation.org
Cc:     kbuild-all@...ts.01.org, minchan@...nel.org, vbabka@...e.cz,
        iamjoonsoo.kim@....com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH v6] mm/page_owner.c: add llseek for page_owner

On 8/11/22 05:02, Kassey Li wrote:
> hi, Vlastimil:
> 
> 
> On 8/10/2022 5:02 PM, kernel test robot wrote:
>> Hi Kassey,
>>
>> Thank you for the patch! Yet something to improve:
>>
>> [auto build test ERROR on v5.19]
>> [also build test ERROR on next-20220810]
>> [cannot apply to akpm-mm/mm-everything linus/master]
>> [If your patch is applied to the wrong git tree, kindly drop us a note.
>> And when submitting patch, we suggest to use '--base' as documented in
>> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>>
>> url:   
>> https://github.com/intel-lab-lkp/linux/commits/Kassey-Li/mm-page_owner-c-add-llseek-for-page_owner/20220810-093417
>> base:    3d7cb6b04c3f3115719235cc6866b10326de34cd
>> config: parisc-buildonly-randconfig-r004-20220810
>> (https://download.01.org/0day-ci/archive/20220810/202208101628.o6qUzx50-lkp@intel.com/config)
>> compiler: hppa-linux-gcc (GCC) 12.1.0
>> 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://github.com/intel-lab-lkp/linux/commit/d2decd69a8d5756c1706092c805a4c8af14df471
>>          git remote add linux-review https://github.com/intel-lab-lkp/linux
>>          git fetch --no-tags linux-review
>> Kassey-Li/mm-page_owner-c-add-llseek-for-page_owner/20220810-093417
>>          git checkout d2decd69a8d5756c1706092c805a4c8af14df471
>>          # save the config file
>>          mkdir build_dir && cp config build_dir/.config
>>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross
>> W=1 O=build_dir ARCH=parisc SHELL=/bin/bash
>>
>> If you fix the issue, kindly add following tag where applicable
>> Reported-by: kernel test robot <lkp@...el.com>
>>
>> All errors (new ones prefixed by >>):
>>
>>     In file included from mm/page_owner.c:16:
>>>> mm/../fs/proc/internal.h:51:9: error: unknown type name 'proc_write_t'
>>        51 |         proc_write_t write;
>>           |         ^~~~~~~~~~~~
> 
> # CONFIG_PROC_FS is not set in some arch, so we can not directly include the
> header file.
> +#include "../fs/proc/internal.h"
> 
> how about add an extern  ? or do you have other suggest  ?

Hi, I replied to v5 after the bot reports:

Sorry, my suggestion (to reuse mem_lseek() from proc) was wrong as the
kernel test bot just showed us. mem_lseek() may be unavailable without
CONFIG_PROC_FS.
The easiest way is to add a page_owner specific lseek function back as in
the early version, but make it correct for SEEK_CUR. Thanks.