Re: [PATCH] mm: add mmap_prepare() compatibility layer for nested file systems

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

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@intel.com/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@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/202506100000.34KZcoZ5-lkp@intel.com/

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

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