[linux-next:master 6300/6828] fs/erofs/ishare.c:157:15: error: implicit declaration of function 'security_mmap_backing_file'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   8e5a478b6d6a5bb0a3d52147862b15e4d826af19
commit: 0e2baaf8fed0eba6ae83949b8bd317d808efd220 [6300/6828] lsm: add the security_mmap_backing_file() hook
config: i386-randconfig-003-20260317 (https://download.01.org/0day-ci/archive/20260318/202603180630.HWujluGX-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260318/202603180630.HWujluGX-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/202603180630.HWujluGX-lkp@intel.com/

All errors (new ones prefixed by >>):

   fs/erofs/ishare.c: In function 'erofs_ishare_mmap':
>> fs/erofs/ishare.c:157:15: error: implicit declaration of function 'security_mmap_backing_file' [-Wimplicit-function-declaration]
     157 |         err = security_mmap_backing_file(vma, realfile, file);
         |               ^~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/security_mmap_backing_file +157 fs/erofs/ishare.c

   149	
   150	static int erofs_ishare_mmap(struct file *file, struct vm_area_struct *vma)
   151	{
   152		struct file *realfile = file->private_data;
   153		int err;
   154	
   155		vma_set_file(vma, realfile);
   156	
 > 157		err = security_mmap_backing_file(vma, realfile, file);
   158		if (err)
   159			return err;
   160	
   161		return generic_file_readonly_mmap(file, vma);
   162	}
   163	

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