Hi Lorenzo, kernel test robot noticed the following build errors: [auto build test ERROR on akpm-mm/mm-everything] url: https://github.com/intel-lab-lkp/linux/commits/Lorenzo-Stoakes/mm-add-mmap_prepare-compatibility-layer-for-nested-file-systems/20250609-172628 base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything patch link: https://lore.kernel.org/r/20250609092413.45435-1-lorenzo.stoakes%40oracle.com patch subject: [PATCH] mm: add mmap_prepare() compatibility layer for nested file systems config: arm-randconfig-002-20250609 (https://download.01.org/0day-ci/archive/20250610/202506100000.34KZcoZ5-lkp@xxxxxxxxx/config) compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250610/202506100000.34KZcoZ5-lkp@xxxxxxxxx/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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202506100000.34KZcoZ5-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): >> ld.lld: error: undefined symbol: compat_vma_mmap_prepare >>> referenced by shm.c >>> ipc/shm.o:(shm_mmap) in archive vmlinux.a >>> referenced by backing-file.c >>> fs/backing-file.o:(backing_file_mmap) in archive vmlinux.a >>> referenced by nommu.c >>> mm/nommu.o:(do_mmap) in archive vmlinux.a >>> referenced 2 more times -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
