[akpm-mm:mm-new 420/429] fs/romfs/mmap-nommu.c:66:42: sparse: sparse: dereference of noderef expression

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

Hi Lorenzo,

FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-new
head:   dc4fe40a11269aead253fa0beb098b00417b8694
commit: 57a654376d4bb67119d436edc8c3c4c0ecb3c369 [420/429] mm: update all remaining mmap_prepare users to use vma_flags_t
config: sh-randconfig-r122-20260122 (https://download.01.org/0day-ci/archive/20260122/202601221505.RxftadLx-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 13.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260122/202601221505.RxftadLx-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/202601221505.RxftadLx-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> fs/romfs/mmap-nommu.c:66:42: sparse: sparse: dereference of noderef expression
>> fs/romfs/mmap-nommu.c:66:42: sparse: sparse: dereference of noderef expression
   fs/romfs/mmap-nommu.c: note: in included file:
   include/linux/mm.h:1954:16: sparse: sparse: dereference of noderef expression
   include/linux/mm.h:1954:16: sparse: sparse: dereference of noderef expression
   include/linux/mm.h:1048:16: sparse: sparse: dereference of noderef expression
   include/linux/mm.h:1954:16: sparse: sparse: dereference of noderef expression
   include/linux/mm.h:1048:16: sparse: sparse: dereference of noderef expression

vim +66 fs/romfs/mmap-nommu.c

    59	
    60	/*
    61	 * permit a R/O mapping to be made directly through onto an MTD device if
    62	 * possible
    63	 */
    64	static int romfs_mmap_prepare(struct vm_area_desc *desc)
    65	{
  > 66		return is_nommu_shared_vma_flags(desc->vma_flags) ? 0 : -ENOSYS;
    67	}
    68	

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