Re: [PATCH] inotify: disallow watches on unsupported filesystems

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

Hi Seyediman,

kernel test robot noticed the following build errors:

[auto build test ERROR on jack-fs/fsnotify]
[also build test ERROR on linus/master v6.14-rc5 next-20250304]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Seyediman-Seyedarab/inotify-disallow-watches-on-unsupported-filesystems/20250304-160213
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs.git fsnotify
patch link:    https://lore.kernel.org/r/20250304080044.7623-1-ImanDevel%40gmail.com
patch subject: [PATCH] inotify: disallow watches on unsupported filesystems
config: s390-randconfig-002-20250305 (https://download.01.org/0day-ci/archive/20250305/202503051755.5uktuxba-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250305/202503051755.5uktuxba-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/202503051755.5uktuxba-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/linux/kernel.h:16,
                    from include/linux/cpumask.h:11,
                    from include/linux/smp.h:13,
                    from include/linux/lockdep.h:14,
                    from include/linux/spinlock.h:63,
                    from include/linux/wait.h:9,
                    from include/linux/wait_bit.h:8,
                    from include/linux/fs.h:6,
                    from fs/notify/inotify/inotify_user.c:17:
   fs/notify/inotify/inotify_user.c: In function 'is_unwatchable_fs':
>> fs/notify/inotify/inotify_user.c:702:40: error: 'unwatchable_fs' undeclared (first use in this function); did you mean 'is_unwatchable_fs'?
     702 |         for (int i = 0; i < ARRAY_SIZE(unwatchable_fs); i++)
         |                                        ^~~~~~~~~~~~~~
   include/linux/array_size.h:11:33: note: in definition of macro 'ARRAY_SIZE'
      11 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
         |                                 ^~~
   fs/notify/inotify/inotify_user.c:702:40: note: each undeclared identifier is reported only once for each function it appears in
     702 |         for (int i = 0; i < ARRAY_SIZE(unwatchable_fs); i++)
         |                                        ^~~~~~~~~~~~~~
   include/linux/array_size.h:11:33: note: in definition of macro 'ARRAY_SIZE'
      11 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
         |                                 ^~~
   In file included from include/linux/file.h:9,
                    from fs/notify/inotify/inotify_user.c:16:
   include/linux/compiler.h:245:77: error: expression in static assertion is not an integer
     245 | #define __BUILD_BUG_ON_ZERO_MSG(e, msg) ((int)sizeof(struct {_Static_assert(!(e), msg);}))
         |                                                                             ^
   include/linux/compiler.h:249:33: note: in expansion of macro '__BUILD_BUG_ON_ZERO_MSG'
     249 | #define __must_be_array(a)      __BUILD_BUG_ON_ZERO_MSG(__same_type((a), &(a)[0]), "must be array")
         |                                 ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/array_size.h:11:59: note: in expansion of macro '__must_be_array'
      11 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
         |                                                           ^~~~~~~~~~~~~~~
   fs/notify/inotify/inotify_user.c:702:29: note: in expansion of macro 'ARRAY_SIZE'
     702 |         for (int i = 0; i < ARRAY_SIZE(unwatchable_fs); i++)
         |                             ^~~~~~~~~~


vim +702 fs/notify/inotify/inotify_user.c

   698	
   699	
   700	static inline bool is_unwatchable_fs(struct inode *inode)
   701	{
 > 702		for (int i = 0; i < ARRAY_SIZE(unwatchable_fs); i++)
   703			if (inode->i_sb->s_magic == unwatchable_fs[i])
   704				return true;
   705		return false;
   706	}
   707	

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