[akpm-mm:mm-new 378/389] drivers/mtd/mtdchar.c:1384:9: error: call to undeclared function 'vma_desc_test_flags'; ISO C99 and later do not support implicit function declarations

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-new
head:   c5a81ff6071bcf42531426e6336b5cc424df6e3d
commit: cf0dfae0323aa8b75cee0b94d5c7553b511d7bc3 [378/389] mtdchar: replace deprecated mmap hook with mmap_prepare, clean up
config: arm-randconfig-002-20260316 (https://download.01.org/0day-ci/archive/20260316/202603161221.qNrB6fVE-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 36041192cf6c9042615c8d2364cacc698ef89865)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260316/202603161221.qNrB6fVE-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/202603161221.qNrB6fVE-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/mtd/mtdchar.c:1384:9: error: call to undeclared function 'vma_desc_test_flags'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    1384 |         return vma_desc_test_flags(desc, VMA_SHARED_BIT) ? 0 : -EACCES;
         |                ^
   1 error generated.


vim +/vma_desc_test_flags +1384 drivers/mtd/mtdchar.c

  1375	
  1376	/*
  1377	 * set up a mapping for shared memory segments
  1378	 */
  1379	static int mtdchar_mmap_prepare(struct vm_area_desc *desc)
  1380	{
  1381	#ifdef CONFIG_MMU
  1382		return -ENODEV;
  1383	#else
> 1384		return vma_desc_test_flags(desc, VMA_SHARED_BIT) ? 0 : -EACCES;
  1385	#endif
  1386	}
  1387	

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