Hi Gabriel,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on pcmoore-audit/next]
[also build test WARNING on ext4/dev linus/master v5.12]
[cannot apply to ext3/fsnotify next-20210426]
[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]

url:    https://github.com/0day-ci/linux/commits/Gabriel-Krisman-Bertazi/File-system-wide-monitoring/20210427-024627
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit.git next
config: microblaze-randconfig-r006-20210426 (attached as .config)
compiler: microblaze-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/0b550d36bb2ec4613ad64b68b18898a72fd5af50
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Gabriel-Krisman-Bertazi/File-system-wide-monitoring/20210427-024627
        git checkout 0b550d36bb2ec4613ad64b68b18898a72fd5af50
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=microblaze 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from include/linux/kernel.h:16,
                    from include/linux/radix-tree.h:12,
                    from include/linux/idr.h:15,
                    from include/linux/fsnotify_backend.h:13,
                    from include/linux/fsnotify.h:15,
                    from fs/notify/ring.c:3:
   fs/notify/ring.c: In function 'fsnotify_ring_alloc_event_slot':
>> include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t' {aka 'unsigned int'} [-Wformat=]
       5 | #define KERN_SOH "\001"  /* ASCII Start Of Header */
         |                  ^~~~~~
   include/linux/printk.h:140:10: note: in definition of macro 'no_printk'
     140 |   printk(fmt, ##__VA_ARGS__);  \
         |          ^~~
   include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
      15 | #define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
         |                    ^~~~~~~~
   include/linux/printk.h:430:12: note: in expansion of macro 'KERN_DEBUG'
     430 |  no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
         |            ^~~~~~~~~~
   fs/notify/ring.c:81:2: note: in expansion of macro 'pr_debug'
      81 |  pr_debug("%s: start group=%p ring_size=%llu, requested=%lu\n", __func__, group,
         |  ^~~~~~~~
   fs/notify/ring.c:81:59: note: format string is defined here
      81 |  pr_debug("%s: start group=%p ring_size=%llu, requested=%lu\n", __func__, group,
         |                                                         ~~^
         |                                                           |
         |                                                           long unsigned int
         |                                                         %u


vim +5 include/linux/kern_levels.h

314ba3520e513a Joe Perches 2012-07-30  4  
04d2c8c83d0e3a Joe Perches 2012-07-30 @5  #define KERN_SOH	"\001"		/* ASCII Start Of Header */
04d2c8c83d0e3a Joe Perches 2012-07-30  6  #define KERN_SOH_ASCII	'\001'
04d2c8c83d0e3a Joe Perches 2012-07-30  7  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org