include/linux/userfaultfd_k.h:221 vma_can_userfault() warn: bitwise AND condition is false here

include/linux/userfaultfd_k.h:221 vma_can_userfault() warn: bitwise AND condition is false here

[kernel test robot]

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: linux-kernel@vger.kernel.org
TO: "Jason A. Donenfeld" <zx2c4@kernel.org>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   a8662bcd2ff152bfbc751cab20f33053d74d0963
commit: 9651fcedf7b92d3f7f1ab179e8ab55b85ee10fc1 mm: add MAP_DROPPABLE for designating always lazily freeable mappings
date:   9 months ago
:::::: branch date: 6 hours ago
:::::: commit date: 9 months ago
config: i386-randconfig-r072-20250405 (https://download.01.org/0day-ci/archive/20250405/202504051652.tDFckPp0-lkp@intel.com/config)
compiler: clang version 20.1.2 (https://github.com/llvm/llvm-project 58df0ef89dd64126512e4ee27b4ac3fd8ddf6247)

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>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202504051652.tDFckPp0-lkp@intel.com/

smatch warnings:
include/linux/userfaultfd_k.h:221 vma_can_userfault() warn: bitwise AND condition is false here

vim +221 include/linux/userfaultfd_k.h

932b18e0aec65a Andrea Arcangeli   2015-09-04  214  
b1f9e876862d8f Peter Xu           2022-05-12  215  static inline bool vma_can_userfault(struct vm_area_struct *vma,
d61ea1cb009532 Peter Xu           2023-08-21  216  				     unsigned long vm_flags,
d61ea1cb009532 Peter Xu           2023-08-21  217  				     bool wp_async)
b1f9e876862d8f Peter Xu           2022-05-12  218  {
d61ea1cb009532 Peter Xu           2023-08-21  219  	vm_flags &= __VM_UFFD_FLAGS;
d61ea1cb009532 Peter Xu           2023-08-21  220  
9651fcedf7b92d Jason A. Donenfeld 2022-12-08 @221  	if (vm_flags & VM_DROPPABLE)
9651fcedf7b92d Jason A. Donenfeld 2022-12-08  222  		return false;
9651fcedf7b92d Jason A. Donenfeld 2022-12-08  223  
67eae54bc227b3 Peter Xu           2022-10-24  224  	if ((vm_flags & VM_UFFD_MINOR) &&
67eae54bc227b3 Peter Xu           2022-10-24  225  	    (!is_vm_hugetlb_page(vma) && !vma_is_shmem(vma)))
67eae54bc227b3 Peter Xu           2022-10-24  226  		return false;
d61ea1cb009532 Peter Xu           2023-08-21  227  
d61ea1cb009532 Peter Xu           2023-08-21  228  	/*
d61ea1cb009532 Peter Xu           2023-08-21  229  	 * If wp async enabled, and WP is the only mode enabled, allow any
d61ea1cb009532 Peter Xu           2023-08-21  230  	 * memory type.
d61ea1cb009532 Peter Xu           2023-08-21  231  	 */
d61ea1cb009532 Peter Xu           2023-08-21  232  	if (wp_async && (vm_flags == VM_UFFD_WP))
d61ea1cb009532 Peter Xu           2023-08-21  233  		return true;
d61ea1cb009532 Peter Xu           2023-08-21  234  

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