Re: [PATCH] mm: Make SPLIT_PTE_PTLOCKS depend on the existence of NR_CPUS

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

Hi Guenter,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/Guenter-Roeck/mm-Make-SPLIT_PTE_PTLOCKS-depend-on-the-existence-of-NR_CPUS/20240923-222628
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20240923142533.1197982-1-linux%40roeck-us.net
patch subject: [PATCH] mm: Make SPLIT_PTE_PTLOCKS depend on the existence of NR_CPUS
config: s390-defconfig (https://download.01.org/0day-ci/archive/20240924/202409240546.SJwj9tUj-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 8663a75fa2f31299ab8d1d90288d9df92aadee88)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240924/202409240546.SJwj9tUj-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/202409240546.SJwj9tUj-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/s390/mm/gmap.c:12:
   In file included from include/linux/pagewalk.h:5:
   In file included from include/linux/mm.h:2198:
   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 +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
>> arch/s390/mm/gmap.c:357:9: error: call to undeclared function 'pmd_pgtable_page'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     357 |         page = pmd_pgtable_page((pmd_t *) entry);
         |                ^
>> arch/s390/mm/gmap.c:357:7: error: incompatible integer to pointer conversion assigning to 'struct page *' from 'int' [-Wint-conversion]
     357 |         page = pmd_pgtable_page((pmd_t *) entry);
         |              ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 warnings and 2 errors generated.


vim +/pmd_pgtable_page +357 arch/s390/mm/gmap.c

1e133ab296f3ff Martin Schwidefsky 2016-03-08  343  
1e133ab296f3ff Martin Schwidefsky 2016-03-08  344  /**
1e133ab296f3ff Martin Schwidefsky 2016-03-08  345   * __gmap_segment_gaddr - find virtual address from segment pointer
1e133ab296f3ff Martin Schwidefsky 2016-03-08  346   * @entry: pointer to a segment table entry in the guest address space
1e133ab296f3ff Martin Schwidefsky 2016-03-08  347   *
1e133ab296f3ff Martin Schwidefsky 2016-03-08  348   * Returns the virtual address in the guest address space for the segment
1e133ab296f3ff Martin Schwidefsky 2016-03-08  349   */
1e133ab296f3ff Martin Schwidefsky 2016-03-08  350  static unsigned long __gmap_segment_gaddr(unsigned long *entry)
1e133ab296f3ff Martin Schwidefsky 2016-03-08  351  {
1e133ab296f3ff Martin Schwidefsky 2016-03-08  352  	struct page *page;
7e25de77bc5ea5 Anshuman Khandual  2022-11-25  353  	unsigned long offset;
1e133ab296f3ff Martin Schwidefsky 2016-03-08  354  
1e133ab296f3ff Martin Schwidefsky 2016-03-08  355  	offset = (unsigned long) entry / sizeof(unsigned long);
1e133ab296f3ff Martin Schwidefsky 2016-03-08  356  	offset = (offset & (PTRS_PER_PMD - 1)) * PMD_SIZE;
7e25de77bc5ea5 Anshuman Khandual  2022-11-25 @357  	page = pmd_pgtable_page((pmd_t *) entry);
1e133ab296f3ff Martin Schwidefsky 2016-03-08  358  	return page->index + offset;
1e133ab296f3ff Martin Schwidefsky 2016-03-08  359  }
1e133ab296f3ff Martin Schwidefsky 2016-03-08  360  

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