Re: [RFC PATCH V0 03/10] mm: Scan the mm and create a migration list

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

Hi Raghavendra,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on bcc8eda6d34934d80b96adb8dc4ff5dfc632a53a]

url:    https://github.com/intel-lab-lkp/linux/commits/Raghavendra-K-T/mm-Add-kmmscand-kernel-daemon/20241201-234153
base:   bcc8eda6d34934d80b96adb8dc4ff5dfc632a53a
patch link:    https://lore.kernel.org/r/20241201153818.2633616-4-raghavendra.kt%40amd.com
patch subject: [RFC PATCH V0 03/10] mm: Scan the mm and create a migration list
config: s390-allmodconfig (https://download.01.org/0day-ci/archive/20241202/202412020401.kTXL2n6L-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 592c0fe55f6d9a811028b5f3507be91458ab2713)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241202/202412020401.kTXL2n6L-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202412020401.kTXL2n6L-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from mm/kmmscand.c:2:
   In file included from include/linux/mm.h:2223:
   include/linux/vmstat.h:504:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     504 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     505 |                            item];
         |                            ~~~~
   include/linux/vmstat.h:511:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     511 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     512 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   include/linux/vmstat.h:524:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     524 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     525 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   In file included from mm/kmmscand.c:14:
   include/linux/mm_inline.h:47:41: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
      47 |         __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages);
         |                                    ~~~~~~~~~~~ ^ ~~~
   include/linux/mm_inline.h:49:22: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
      49 |                                 NR_ZONE_LRU_BASE + lru, nr_pages);
         |                                 ~~~~~~~~~~~~~~~~ ^ ~~~
>> mm/kmmscand.c:159:36: error: use of undeclared identifier 'vma'
     159 |         VM_BUG_ON_VMA(address == -EFAULT, vma);
         |                                           ^
   6 warnings and 1 error generated.


vim +/vma +159 mm/kmmscand.c

   145	
   146	static void page_idle_clear_pte_refs(struct page *page, pte_t *pte, struct mm_walk *walk)
   147	{
   148		bool need_lock;
   149		struct folio *folio =  page_folio(page);
   150		unsigned long address;
   151	
   152		if (!folio_mapped(folio) || !folio_raw_mapping(folio))
   153			return;
   154	
   155		need_lock = !folio_test_anon(folio) || folio_test_ksm(folio);
   156		if (need_lock && !folio_trylock(folio))
   157			return;
   158		address = vma_address(walk->vma, page_pgoff(folio, page), compound_nr(page));
 > 159		VM_BUG_ON_VMA(address == -EFAULT, vma);
   160		folio_idle_clear_pte_refs_one(folio, walk->vma, address, pte);
   161	
   162		if (need_lock)
   163			folio_unlock(folio);
   164	}
   165	

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