Re: [PATCH v1] mm/vmscan: check the return value of migrate_pages()

[kernel test robot <lkp@intel.com>]

Hi Li,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v6.0-rc5]
[cannot apply to akpm-mm/mm-everything next-20220916]
[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/Li-Zhong/mm-vmscan-check-the-return-value-of-migrate_pages/20220917-101433
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git a335366bad1364a07f49df9da1fdfa6d411a5f39
config: arc-randconfig-r043-20220916 (https://download.01.org/0day-ci/archive/20220917/202209171222.QsovW80r-lkp@intel.com/config)
compiler: arceb-elf-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/0ea516d584bd904c43954e312ac42fced822dcf7
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Li-Zhong/mm-vmscan-check-the-return-value-of-migrate_pages/20220917-101433
        git checkout 0ea516d584bd904c43954e312ac42fced822dcf7
        # 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=arc SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   mm/vmscan.c: In function 'demote_page_list':
>> mm/vmscan.c:1564:40: error: 'pagelist' undeclared (first use in this function)
    1564 |                 putback_movable_pages(&pagelist);
         |                                        ^~~~~~~~
   mm/vmscan.c:1564:40: note: each undeclared identifier is reported only once for each function it appears in


vim +/pagelist +1564 mm/vmscan.c

  1539	
  1540	/*
  1541	 * Take pages on @demote_list and attempt to demote them to
  1542	 * another node.  Pages which are not demoted are left on
  1543	 * @demote_pages.
  1544	 */
  1545	static unsigned int demote_page_list(struct list_head *demote_pages,
  1546					     struct pglist_data *pgdat)
  1547	{
  1548		int target_nid = next_demotion_node(pgdat->node_id);
  1549		unsigned int nr_succeeded;
  1550		int ret;
  1551	
  1552		if (list_empty(demote_pages))
  1553			return 0;
  1554	
  1555		if (target_nid == NUMA_NO_NODE)
  1556			return 0;
  1557	
  1558		/* Demotion ignores all cpuset and mempolicy settings */
  1559		ret = migrate_pages(demote_pages, alloc_demote_page, NULL,
  1560				    target_nid, MIGRATE_ASYNC, MR_DEMOTION,
  1561				    &nr_succeeded);
  1562	
  1563		if (ret)
> 1564			putback_movable_pages(&pagelist);
  1565	
  1566		if (current_is_kswapd())
  1567			__count_vm_events(PGDEMOTE_KSWAPD, nr_succeeded);
  1568		else
  1569			__count_vm_events(PGDEMOTE_DIRECT, nr_succeeded);
  1570	
  1571		return nr_succeeded;
  1572	}
  1573	

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