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X-CSE-ConnectionGUID: JQXXfd66QqyLXvTBSYfB2A== X-CSE-MsgGUID: OFBCKsTnRkCgMaGTpfGPpg== X-IronPort-AV: E=McAfee;i="6800,10657,11781"; a="79337535" X-IronPort-AV: E=Sophos;i="6.23,225,1770624000"; d="scan'208";a="79337535" Received: from fmviesa010.fm.intel.com ([10.60.135.150]) by fmvoesa108.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 May 2026 10:47:53 -0700 X-CSE-ConnectionGUID: OpNjp2pVRFmEA4BEm2AF5g== X-CSE-MsgGUID: ulgX9TAOSc+XhgM+6wJQvQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,225,1770624000"; d="scan'208";a="232714726" Received: from lkp-server01.sh.intel.com (HELO 82327192134e) ([10.239.97.150]) by fmviesa010.fm.intel.com with ESMTP; 09 May 2026 10:47:52 -0700 Received: from kbuild by 82327192134e with local (Exim 4.98.2) (envelope-from ) id 1wLlmH-000000001GD-32Ii; Sat, 09 May 2026 17:47:49 +0000 Date: Sun, 10 May 2026 01:47:42 +0800 From: kernel test robot To: oe-kbuild@lists.linux.dev Cc: lkp@intel.com, Dan Carpenter Subject: [kas:uffd/v2 7/14] include/linux/mm.h:4618 gup_can_follow_protnone() warn: bitwise AND condition is false here Message-ID: <202605100132.U77SlLEg-lkp@intel.com> User-Agent: s-nail v14.9.25 Precedence: bulk X-Mailing-List: oe-kbuild@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: BCC: lkp@intel.com CC: oe-kbuild-all@lists.linux.dev TO: "Kiryl Shutsemau (Meta)" tree: https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git uffd/v2 head: 0b6f87fd4809245f9eebee73f34e2fb14230330c commit: c88e78ffb2cc5ca81f5a6319b7e3c4ffd8baefe1 [7/14] mm: handle VM_UFFD_RWP in khugepaged, rmap, and GUP :::::: branch date: 26 hours ago :::::: commit date: 26 hours ago config: m68k-randconfig-r073-20260509 (https://download.01.org/0day-ci/archive/20260510/202605100132.U77SlLEg-lkp@intel.com/config) compiler: m68k-linux-gcc (GCC) 12.5.0 smatch: v0.5.0-9065-ge9cc34fd 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 | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202605100132.U77SlLEg-lkp@intel.com/ smatch warnings: include/linux/mm.h:4618 gup_can_follow_protnone() warn: bitwise AND condition is false here vim +4618 include/linux/mm.h 9a291a7c9428155 James Morse 2017-06-02 4605 474098edac262ae David Hildenbrand 2022-08-25 4606 /* 474098edac262ae David Hildenbrand 2022-08-25 4607 * Indicates whether GUP can follow a PROT_NONE mapped page, or whether c88e78ffb2cc5ca Kiryl Shutsemau (Meta 2026-04-22 4608) * a (NUMA hinting or userfaultfd RWP) fault is required. 474098edac262ae David Hildenbrand 2022-08-25 4609 */ da0045587d59d4f Max Kellermann 2025-09-01 4610 static inline bool gup_can_follow_protnone(const struct vm_area_struct *vma, d74943a2f3cdade David Hildenbrand 2023-08-03 4611 unsigned int flags) 474098edac262ae David Hildenbrand 2022-08-25 4612 { c88e78ffb2cc5ca Kiryl Shutsemau (Meta 2026-04-22 4613) /* c88e78ffb2cc5ca Kiryl Shutsemau (Meta 2026-04-22 4614) * VM_UFFD_RWP uses protnone as an access-tracking marker, not for c88e78ffb2cc5ca Kiryl Shutsemau (Meta 2026-04-22 4615) * NUMA hinting. GUP must always take a fault so the access is c88e78ffb2cc5ca Kiryl Shutsemau (Meta 2026-04-22 4616) * delivered to userfaultfd, regardless of FOLL_HONOR_NUMA_FAULT. c88e78ffb2cc5ca Kiryl Shutsemau (Meta 2026-04-22 4617) */ c88e78ffb2cc5ca Kiryl Shutsemau (Meta 2026-04-22 @4618) if (vma->vm_flags & VM_UFFD_RWP) c88e78ffb2cc5ca Kiryl Shutsemau (Meta 2026-04-22 4619) return false; c88e78ffb2cc5ca Kiryl Shutsemau (Meta 2026-04-22 4620) 474098edac262ae David Hildenbrand 2022-08-25 4621 /* d74943a2f3cdade David Hildenbrand 2023-08-03 4622 * If callers don't want to honor NUMA hinting faults, no need to d74943a2f3cdade David Hildenbrand 2023-08-03 4623 * determine if we would actually have to trigger a NUMA hinting fault. 474098edac262ae David Hildenbrand 2022-08-25 4624 */ d74943a2f3cdade David Hildenbrand 2023-08-03 4625 if (!(flags & FOLL_HONOR_NUMA_FAULT)) d74943a2f3cdade David Hildenbrand 2023-08-03 4626 return true; d74943a2f3cdade David Hildenbrand 2023-08-03 4627 d74943a2f3cdade David Hildenbrand 2023-08-03 4628 /* d74943a2f3cdade David Hildenbrand 2023-08-03 4629 * NUMA hinting faults don't apply in inaccessible (PROT_NONE) VMAs. d74943a2f3cdade David Hildenbrand 2023-08-03 4630 * d74943a2f3cdade David Hildenbrand 2023-08-03 4631 * Requiring a fault here even for inaccessible VMAs would mean that d74943a2f3cdade David Hildenbrand 2023-08-03 4632 * FOLL_FORCE cannot make any progress, because handle_mm_fault() d74943a2f3cdade David Hildenbrand 2023-08-03 4633 * refuses to process NUMA hinting faults in inaccessible VMAs. d74943a2f3cdade David Hildenbrand 2023-08-03 4634 */ d74943a2f3cdade David Hildenbrand 2023-08-03 4635 return !vma_is_accessible(vma); 474098edac262ae David Hildenbrand 2022-08-25 4636 } 474098edac262ae David Hildenbrand 2022-08-25 4637 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki