[linux-next:master 6398/6705] mm/page_table_check.c:194:1: warning: control reaches end of non-void function

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   4eab358930711bbeb85bf5ee267d0d42d3394c2c
commit: 62754e4df9e04c4576e989f5ea2b909e824d8164 [6398/6705] mm/page_table_check: support userfault wr-protect entries
config: riscv-randconfig-r001-20230105 (https://download.01.org/0day-ci/archive/20240417/202404171745.Zd13ydca-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240417/202404171745.Zd13ydca-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/202404171745.Zd13ydca-lkp@intel.com/

All warnings (new ones prefixed by >>):

   mm/page_table_check.c: In function 'swap_cached_writable':
   mm/page_table_check.c:192:24: error: 'SWP_DEVICE_EXCLUSIVE_WRITE' undeclared (first use in this function)
     192 |         return type == SWP_DEVICE_EXCLUSIVE_WRITE ||
         |                        ^~~~~~~~~~~~~~~~~~~~~~~~~~
   mm/page_table_check.c:192:24: note: each undeclared identifier is reported only once for each function it appears in
>> mm/page_table_check.c:194:1: warning: control reaches end of non-void function [-Wreturn-type]
     194 | }
         | ^


vim +194 mm/page_table_check.c

   186	
   187	/* Whether the swap entry cached writable information */
   188	static inline bool swap_cached_writable(swp_entry_t entry)
   189	{
   190		unsigned type = swp_type(entry);
   191	
   192		return type == SWP_DEVICE_EXCLUSIVE_WRITE ||
   193		    type == SWP_MIGRATION_WRITE;
 > 194	}
   195	

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