Re: [PATCH v2 mm-hotfixes 3/5] x86/mm: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings()

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

Hi Harry,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/Harry-Yoo/mm-move-page-table-sync-declarations-to-asm-pgalloc-h/20250721-074448
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20250720234203.9126-4-harry.yoo%40oracle.com
patch subject: [PATCH v2 mm-hotfixes 3/5] x86/mm: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings()
config: i386-buildonly-randconfig-003-20250721 (https://download.01.org/0day-ci/archive/20250721/202507211433.J7CqBp8O-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14+deb12u1) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250721/202507211433.J7CqBp8O-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/202507211433.J7CqBp8O-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from mm/mremap.c:31:
>> arch/x86/include/asm/pgalloc.h:13: warning: "ARCH_PAGE_TABLE_SYNC_MASK" redefined
      13 | #define ARCH_PAGE_TABLE_SYNC_MASK \
         | 
   In file included from arch/x86/include/asm/pgtable_32_types.h:15,
                    from arch/x86/include/asm/pgtable_types.h:278,
                    from arch/x86/include/asm/paravirt_types.h:11,
                    from arch/x86/include/asm/ptrace.h:175,
                    from arch/x86/include/asm/math_emu.h:5,
                    from arch/x86/include/asm/processor.h:13,
                    from arch/x86/include/asm/cpufeature.h:5,
                    from arch/x86/include/asm/thread_info.h:59,
                    from include/linux/thread_info.h:60,
                    from include/linux/spinlock.h:60,
                    from include/linux/mmzone.h:8,
                    from include/linux/gfp.h:7,
                    from include/linux/mm.h:7,
                    from mm/mremap.c:11:
   arch/x86/include/asm/pgtable-2level_types.h:21: note: this is the location of the previous definition
      21 | #define ARCH_PAGE_TABLE_SYNC_MASK       PGTBL_PMD_MODIFIED
         | 


vim +/ARCH_PAGE_TABLE_SYNC_MASK +13 arch/x86/include/asm/pgalloc.h

    10	
    11	#define __HAVE_ARCH_PTE_ALLOC_ONE
    12	#define __HAVE_ARCH_PGD_FREE
  > 13	#define ARCH_PAGE_TABLE_SYNC_MASK \
    14		(pgtable_l5_enabled() ? PGTBL_PGD_MODIFIED : PGTBL_P4D_MODIFIED)
    15	#include <asm-generic/pgalloc.h>
    16	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki