Re: [PATCH v2 1/4] mm: declare VMA flags by bit

Re: [PATCH v2 1/4] mm: declare VMA flags by bit

[kernel test robot]

Hi Lorenzo,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on next-20251114]
[cannot apply to rust/rust-next tip/sched/core brauner-vfs/vfs.all kees/for-next/execve linus/master v6.18-rc5]
[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/Lorenzo-Stoakes/mm-declare-VMA-flags-by-bit/20251114-213237
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/6289d60b6731ea7a111c87c87fb8486881151c25.1763126447.git.lorenzo.stoakes%40oracle.com
patch subject: [PATCH v2 1/4] mm: declare VMA flags by bit
config: arm-allnoconfig (https://download.01.org/0day-ci/archive/20251114/202511142237.yj4hppoj-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 0bba1e76581bad04e7d7f09f5115ae5e2989e0d9)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251114/202511142237.yj4hppoj-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/202511142237.yj4hppoj-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/arm/kernel/asm-offsets.c:14:
>> include/linux/mm.h:1734:32: error: use of undeclared identifier 'VM_MAYOVERLAY'
    1734 |         return flags & (VM_MAYSHARE | VM_MAYOVERLAY);
         |                                       ^~~~~~~~~~~~~
   1 error generated.
   make[3]: *** [scripts/Makefile.build:182: arch/arm/kernel/asm-offsets.s] Error 1
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1280: prepare0] Error 2
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:248: __sub-make] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:248: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +/VM_MAYOVERLAY +1734 include/linux/mm.h

97a7e4733b9b22 Peter Xu          2021-03-12  1722  
fc4f4be9b5271e David Hildenbrand 2023-01-02  1723  #ifndef CONFIG_MMU
fc4f4be9b5271e David Hildenbrand 2023-01-02  1724  static inline bool is_nommu_shared_mapping(vm_flags_t flags)
fc4f4be9b5271e David Hildenbrand 2023-01-02  1725  {
fc4f4be9b5271e David Hildenbrand 2023-01-02  1726  	/*
fc4f4be9b5271e David Hildenbrand 2023-01-02  1727  	 * NOMMU shared mappings are ordinary MAP_SHARED mappings and selected
fc4f4be9b5271e David Hildenbrand 2023-01-02  1728  	 * R/O MAP_PRIVATE file mappings that are an effective R/O overlay of
fc4f4be9b5271e David Hildenbrand 2023-01-02  1729  	 * a file mapping. R/O MAP_PRIVATE mappings might still modify
fc4f4be9b5271e David Hildenbrand 2023-01-02  1730  	 * underlying memory if ptrace is active, so this is only possible if
fc4f4be9b5271e David Hildenbrand 2023-01-02  1731  	 * ptrace does not apply. Note that there is no mprotect() to upgrade
fc4f4be9b5271e David Hildenbrand 2023-01-02  1732  	 * write permissions later.
fc4f4be9b5271e David Hildenbrand 2023-01-02  1733  	 */
b6b7a8faf05c70 David Hildenbrand 2023-01-02 @1734  	return flags & (VM_MAYSHARE | VM_MAYOVERLAY);
fc4f4be9b5271e David Hildenbrand 2023-01-02  1735  }
fc4f4be9b5271e David Hildenbrand 2023-01-02  1736  #endif
fc4f4be9b5271e David Hildenbrand 2023-01-02  1737  

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