[android-common:android13-5.15 4/4] include/linux/userfaultfd_k.h:81:64: sparse: sparse: incompatible types in comparison expression (different address spaces):

[android-common:android13-5.15 4/4] include/linux/userfaultfd_k.h:81:64: sparse: sparse: incompatible types in comparison expression (different address spaces):

[kernel test robot]

tree:   https://android.googlesource.com/kernel/common android13-5.15
head:   fc88a7504f0f262cc5b2e8a7f58b2a1108034856
commit: 9b613572d6246da9b616f34e4a0e0b5ac74b2dd0 [4/4] ANDROID: userfaultfd: allow SPF for UFFD_FEATURE_SIGBUS on private+anon
config: i386-randconfig-r133-20260325 (https://download.01.org/0day-ci/archive/20260327/202603272106.IALaEpg0-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260327/202603272106.IALaEpg0-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/202603272106.IALaEpg0-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   mm/mmap.c: note: in included file (through include/linux/hugetlb.h):
>> include/linux/userfaultfd_k.h:81:64: sparse: sparse: incompatible types in comparison expression (different address spaces):
   include/linux/userfaultfd_k.h:81:64: sparse:    struct userfaultfd_ctx *
   include/linux/userfaultfd_k.h:81:64: sparse:    struct userfaultfd_ctx [noderef] __rcu *
>> include/linux/userfaultfd_k.h:81:64: sparse: sparse: incompatible types in comparison expression (different address spaces):
   include/linux/userfaultfd_k.h:81:64: sparse:    struct userfaultfd_ctx *
   include/linux/userfaultfd_k.h:81:64: sparse:    struct userfaultfd_ctx [noderef] __rcu *
--
>> fs/userfaultfd.c:757:29: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct userfaultfd_ctx [noderef] __rcu *ctx @@     got struct userfaultfd_ctx *[assigned] ctx @@
   fs/userfaultfd.c:757:29: sparse:     expected struct userfaultfd_ctx [noderef] __rcu *ctx
   fs/userfaultfd.c:757:29: sparse:     got struct userfaultfd_ctx *[assigned] ctx
>> fs/userfaultfd.c:771:45: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct userfaultfd_ctx *ctx @@     got struct userfaultfd_ctx [noderef] __rcu *ctx @@
   fs/userfaultfd.c:771:45: sparse:     expected struct userfaultfd_ctx *ctx
   fs/userfaultfd.c:771:45: sparse:     got struct userfaultfd_ctx [noderef] __rcu *ctx
>> fs/userfaultfd.c:1483:64: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct userfaultfd_ctx [noderef] __rcu *ctx @@     got struct userfaultfd_ctx *ctx @@
   fs/userfaultfd.c:1483:64: sparse:     expected struct userfaultfd_ctx [noderef] __rcu *ctx
   fs/userfaultfd.c:1483:64: sparse:     got struct userfaultfd_ctx *ctx

vim +81 include/linux/userfaultfd_k.h

    58	
    59	extern int mfill_atomic_install_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd,
    60					    struct vm_area_struct *dst_vma,
    61					    unsigned long dst_addr, struct page *page,
    62					    bool newly_allocated, bool wp_copy);
    63	
    64	extern ssize_t mcopy_atomic(struct mm_struct *dst_mm, unsigned long dst_start,
    65				    unsigned long src_start, unsigned long len,
    66				    atomic_t *mmap_changing, __u64 mode);
    67	extern ssize_t mfill_zeropage(struct mm_struct *dst_mm,
    68				      unsigned long dst_start,
    69				      unsigned long len,
    70				      atomic_t *mmap_changing);
    71	extern ssize_t mcopy_continue(struct mm_struct *dst_mm, unsigned long dst_start,
    72				      unsigned long len, atomic_t *mmap_changing);
    73	extern int mwriteprotect_range(struct mm_struct *dst_mm,
    74				       unsigned long start, unsigned long len,
    75				       bool enable_wp, atomic_t *mmap_changing);
    76	
    77	/* mm helpers */
    78	static inline bool is_mergeable_vm_userfaultfd_ctx(struct vm_area_struct *vma,
    79						struct vm_userfaultfd_ctx vm_ctx)
    80	{
  > 81		return rcu_access_pointer(vma->vm_userfaultfd_ctx.ctx) == vm_ctx.ctx;
    82	}
    83	

-- 
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https://github.com/intel/lkp-tests/wiki