Re: [PATCH v13 2/8] drm/ttm: Provide a shmem backup implementation

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

Hi Thomas,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm-xe/drm-xe-next]
[also build test ERROR on linus/master v6.12-rc7 next-20241113]
[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/Thomas-Hellstr-m/drm-ttm-Balance-ttm_resource_cursor_init-and-ttm_resource_cursor_fini/20241114-023727
base:   https://gitlab.freedesktop.org/drm/xe/kernel.git drm-xe-next
patch link:    https://lore.kernel.org/r/20241113183550.6228-3-thomas.hellstrom%40linux.intel.com
patch subject: [PATCH v13 2/8] drm/ttm: Provide a shmem backup implementation
config: s390-allmodconfig (https://download.01.org/0day-ci/archive/20241114/202411140712.uPD3DXCY-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/20241114/202411140712.uPD3DXCY-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/202411140712.uPD3DXCY-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/gpu/drm/ttm/ttm_backup.c:6:
   In file included from include/drm/ttm/ttm_backup.h:10:
   In file included from include/linux/shmem_fs.h:6:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:21:
   In file included from include/linux/mm.h:2213:
   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 +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
>> drivers/gpu/drm/ttm/ttm_backup.c:17:9: error: casting from randomized structure pointer type 'struct file *' to 'struct ttm_backup *'
      17 |         return (struct ttm_backup *)file;
         |                ^
   4 warnings and 1 error generated.


vim +17 drivers/gpu/drm/ttm/ttm_backup.c

    14	
    15	static struct ttm_backup *ttm_file_to_backup(struct file *file)
    16	{
  > 17		return (struct ttm_backup *)file;
    18	}
    19	

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