Re: [PATCH 4/4] mm: Apply vm_uffd_ops API to core mm

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

Hi Peter,

kernel test robot noticed the following build warnings:

[auto build test WARNING on next-20250620]
[cannot apply to akpm-mm/mm-everything linus/master v6.16-rc2 v6.16-rc1 v6.15 v6.16-rc2]
[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/Peter-Xu/mm-Introduce-vm_uffd_ops-API/20250621-030557
base:   next-20250620
patch link:    https://lore.kernel.org/r/20250620190342.1780170-5-peterx%40redhat.com
patch subject: [PATCH 4/4] mm: Apply vm_uffd_ops API to core mm
config: i386-randconfig-061-20250622 (https://download.01.org/0day-ci/archive/20250623/202506230216.JVgQj2Si-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250623/202506230216.JVgQj2Si-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/202506230216.JVgQj2Si-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   mm/shmem.c: note: in included file (through include/linux/shmem_fs.h):
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
--
   mm/hugetlb.c:669:12: sparse: sparse: context imbalance in 'allocate_file_region_entries' - wrong count at exit
   mm/hugetlb.c:740:13: sparse: sparse: context imbalance in 'region_add' - wrong count at exit
   mm/hugetlb.c:807:13: sparse: sparse: context imbalance in 'region_chg' - wrong count at exit
   mm/hugetlb.c:5798:20: sparse: sparse: context imbalance in 'move_huge_pte' - different lock contexts for basic block
   mm/hugetlb.c: note: in included file:
   include/linux/mm.h:1391:22: sparse: sparse: context imbalance in 'hugetlb_wp' - unexpected unlock
   mm/hugetlb.c: note: in included file (through include/linux/hugetlb.h, include/linux/migrate.h):
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
--
   mm/userfaultfd.c:270:9: sparse: sparse: context imbalance in 'mfill_atomic_install_pte' - different lock contexts for basic block
   mm/userfaultfd.c:412:9: sparse: sparse: context imbalance in 'mfill_atomic_pte_zeropage' - different lock contexts for basic block
   mm/userfaultfd.c:498:9: sparse: sparse: context imbalance in 'mfill_atomic_pte_poison' - different lock contexts for basic block
   mm/userfaultfd.c: note: in included file:
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
>> include/linux/userfaultfd_k.h:90:17: sparse: sparse: cast from restricted uffd_flags_t
   mm/userfaultfd.c: note: in included file (through include/linux/rbtree.h, include/linux/mm_types.h, include/linux/mmzone.h, ...):
   include/linux/rcupdate.h:871:25: sparse: sparse: context imbalance in 'move_pages_pte' - unexpected unlock

vim +90 include/linux/userfaultfd_k.h

    87	
    88	static inline enum mfill_atomic_mode uffd_flags_get_mode(uffd_flags_t flags)
    89	{
  > 90		return (enum mfill_atomic_mode)(flags & MFILL_ATOMIC_MODE_MASK);
    91	}
    92	

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