Hi Amir,

I love your patch! Perhaps something to improve:

[auto build test WARNING on 11a48a5a18c63fd7621bb050228cebf13566e4d8]

url:    https://github.com/0day-ci/linux/commits/Amir-Goldstein/Fanotify-event-with-name-info/20200219-160517
base:    11a48a5a18c63fd7621bb050228cebf13566e4d8
config: microblaze-randconfig-a001-20200219 (attached as .config)
compiler: microblaze-linux-gcc (GCC) 7.5.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.5.0 make.cross ARCH=microblaze 

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

All warnings (new ones prefixed by >>):

   In file included from include/linux/kernel.h:15:0,
                    from include/linux/list.h:9,
                    from include/linux/preempt.h:11,
                    from include/linux/spinlock.h:51,
                    from include/linux/seqlock.h:36,
                    from include/linux/time.h:6,
                    from include/linux/stat.h:19,
                    from include/linux/fcntl.h:5,
                    from fs/notify/fanotify/fanotify_user.c:3:
   fs/notify/fanotify/fanotify_user.c: In function 'copy_info_to_user':
>> include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'size_t {aka unsigned int}' [-Wformat=]
    #define KERN_SOH "\001"  /* ASCII Start Of Header */
                     ^
   include/linux/printk.h:137:10: note: in definition of macro 'no_printk'
      printk(fmt, ##__VA_ARGS__);  \
             ^~~
   include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
    #define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
                       ^~~~~~~~
   include/linux/printk.h:341:12: note: in expansion of macro 'KERN_DEBUG'
     no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
               ^~~~~~~~~~
   fs/notify/fanotify/fanotify_user.c:238:2: note: in expansion of macro 'pr_debug'
     pr_debug("%s: fh_len=%lu name_len=%lu, info_len=%lu, count=%lu\n",
     ^~~~~~~~
   fs/notify/fanotify/fanotify_user.c:238:25: note: format string is defined here
     pr_debug("%s: fh_len=%lu name_len=%lu, info_len=%lu, count=%lu\n",
                          ~~^
                          %u
   In file included from include/linux/kernel.h:15:0,
                    from include/linux/list.h:9,
                    from include/linux/preempt.h:11,
                    from include/linux/spinlock.h:51,
                    from include/linux/seqlock.h:36,
                    from include/linux/time.h:6,
                    from include/linux/stat.h:19,
                    from include/linux/fcntl.h:5,
                    from fs/notify/fanotify/fanotify_user.c:3:
   include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t {aka unsigned int}' [-Wformat=]
    #define KERN_SOH "\001"  /* ASCII Start Of Header */
                     ^
   include/linux/printk.h:137:10: note: in definition of macro 'no_printk'
      printk(fmt, ##__VA_ARGS__);  \
             ^~~
   include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
    #define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
                       ^~~~~~~~
   include/linux/printk.h:341:12: note: in expansion of macro 'KERN_DEBUG'
     no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
               ^~~~~~~~~~
   fs/notify/fanotify/fanotify_user.c:238:2: note: in expansion of macro 'pr_debug'
     pr_debug("%s: fh_len=%lu name_len=%lu, info_len=%lu, count=%lu\n",
     ^~~~~~~~
   fs/notify/fanotify/fanotify_user.c:238:38: note: format string is defined here
     pr_debug("%s: fh_len=%lu name_len=%lu, info_len=%lu, count=%lu\n",
                                       ~~^
                                       %u
   In file included from include/linux/kernel.h:15:0,
                    from include/linux/list.h:9,
                    from include/linux/preempt.h:11,
                    from include/linux/spinlock.h:51,
                    from include/linux/seqlock.h:36,
                    from include/linux/time.h:6,
                    from include/linux/stat.h:19,
                    from include/linux/fcntl.h:5,
                    from fs/notify/fanotify/fanotify_user.c:3:
   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=]
    #define KERN_SOH "\001"  /* ASCII Start Of Header */
                     ^
   include/linux/printk.h:137:10: note: in definition of macro 'no_printk'
      printk(fmt, ##__VA_ARGS__);  \
             ^~~
   include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
    #define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
                       ^~~~~~~~
   include/linux/printk.h:341:12: note: in expansion of macro 'KERN_DEBUG'
     no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
               ^~~~~~~~~~
   fs/notify/fanotify/fanotify_user.c:238:2: note: in expansion of macro 'pr_debug'
     pr_debug("%s: fh_len=%lu name_len=%lu, info_len=%lu, count=%lu\n",
     ^~~~~~~~
   fs/notify/fanotify/fanotify_user.c:238:52: note: format string is defined here
     pr_debug("%s: fh_len=%lu name_len=%lu, info_len=%lu, count=%lu\n",
                                                     ~~^
                                                     %u
   In file included from include/linux/kernel.h:15:0,
                    from include/linux/list.h:9,
                    from include/linux/preempt.h:11,
                    from include/linux/spinlock.h:51,
                    from include/linux/seqlock.h:36,
                    from include/linux/time.h:6,
                    from include/linux/stat.h:19,
                    from include/linux/fcntl.h:5,
                    from fs/notify/fanotify/fanotify_user.c:3:
   include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 6 has type 'size_t {aka unsigned int}' [-Wformat=]
    #define KERN_SOH "\001"  /* ASCII Start Of Header */
                     ^
   include/linux/printk.h:137:10: note: in definition of macro 'no_printk'
      printk(fmt, ##__VA_ARGS__);  \
             ^~~
   include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
    #define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
                       ^~~~~~~~
   include/linux/printk.h:341:12: note: in expansion of macro 'KERN_DEBUG'
     no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
               ^~~~~~~~~~
   fs/notify/fanotify/fanotify_user.c:238:2: note: in expansion of macro 'pr_debug'
     pr_debug("%s: fh_len=%lu name_len=%lu, info_len=%lu, count=%lu\n",
     ^~~~~~~~
   fs/notify/fanotify/fanotify_user.c:238:63: note: format string is defined here
     pr_debug("%s: fh_len=%lu name_len=%lu, info_len=%lu, count=%lu\n",
--
   In file included from include/linux/kernel.h:15:0,
                    from include/linux/list.h:9,
                    from include/linux/preempt.h:11,
                    from include/linux/spinlock.h:51,
                    from include/linux/seqlock.h:36,
                    from include/linux/time.h:6,
                    from include/linux/stat.h:19,
                    from include/linux/fcntl.h:5,
                    from fs/notify//fanotify/fanotify_user.c:3:
   fs/notify//fanotify/fanotify_user.c: In function 'copy_info_to_user':
>> include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'size_t {aka unsigned int}' [-Wformat=]
    #define KERN_SOH "\001"  /* ASCII Start Of Header */
                     ^
   include/linux/printk.h:137:10: note: in definition of macro 'no_printk'
      printk(fmt, ##__VA_ARGS__);  \
             ^~~
   include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
    #define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
                       ^~~~~~~~
   include/linux/printk.h:341:12: note: in expansion of macro 'KERN_DEBUG'
     no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
               ^~~~~~~~~~
   fs/notify//fanotify/fanotify_user.c:238:2: note: in expansion of macro 'pr_debug'
     pr_debug("%s: fh_len=%lu name_len=%lu, info_len=%lu, count=%lu\n",
     ^~~~~~~~
   fs/notify//fanotify/fanotify_user.c:238:25: note: format string is defined here
     pr_debug("%s: fh_len=%lu name_len=%lu, info_len=%lu, count=%lu\n",
                          ~~^
                          %u
   In file included from include/linux/kernel.h:15:0,
                    from include/linux/list.h:9,
                    from include/linux/preempt.h:11,
                    from include/linux/spinlock.h:51,
                    from include/linux/seqlock.h:36,
                    from include/linux/time.h:6,
                    from include/linux/stat.h:19,
                    from include/linux/fcntl.h:5,
                    from fs/notify//fanotify/fanotify_user.c:3:
   include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t {aka unsigned int}' [-Wformat=]
    #define KERN_SOH "\001"  /* ASCII Start Of Header */
                     ^
   include/linux/printk.h:137:10: note: in definition of macro 'no_printk'
      printk(fmt, ##__VA_ARGS__);  \
             ^~~
   include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
    #define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
                       ^~~~~~~~
   include/linux/printk.h:341:12: note: in expansion of macro 'KERN_DEBUG'
     no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
               ^~~~~~~~~~
   fs/notify//fanotify/fanotify_user.c:238:2: note: in expansion of macro 'pr_debug'
     pr_debug("%s: fh_len=%lu name_len=%lu, info_len=%lu, count=%lu\n",
     ^~~~~~~~
   fs/notify//fanotify/fanotify_user.c:238:38: note: format string is defined here
     pr_debug("%s: fh_len=%lu name_len=%lu, info_len=%lu, count=%lu\n",
                                       ~~^
                                       %u
   In file included from include/linux/kernel.h:15:0,
                    from include/linux/list.h:9,
                    from include/linux/preempt.h:11,
                    from include/linux/spinlock.h:51,
                    from include/linux/seqlock.h:36,
                    from include/linux/time.h:6,
                    from include/linux/stat.h:19,
                    from include/linux/fcntl.h:5,
                    from fs/notify//fanotify/fanotify_user.c:3:
   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=]
    #define KERN_SOH "\001"  /* ASCII Start Of Header */
                     ^
   include/linux/printk.h:137:10: note: in definition of macro 'no_printk'
      printk(fmt, ##__VA_ARGS__);  \
             ^~~
   include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
    #define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
                       ^~~~~~~~
   include/linux/printk.h:341:12: note: in expansion of macro 'KERN_DEBUG'
     no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
               ^~~~~~~~~~
   fs/notify//fanotify/fanotify_user.c:238:2: note: in expansion of macro 'pr_debug'
     pr_debug("%s: fh_len=%lu name_len=%lu, info_len=%lu, count=%lu\n",
     ^~~~~~~~
   fs/notify//fanotify/fanotify_user.c:238:52: note: format string is defined here
     pr_debug("%s: fh_len=%lu name_len=%lu, info_len=%lu, count=%lu\n",
                                                     ~~^
                                                     %u
   In file included from include/linux/kernel.h:15:0,
                    from include/linux/list.h:9,
                    from include/linux/preempt.h:11,
                    from include/linux/spinlock.h:51,
                    from include/linux/seqlock.h:36,
                    from include/linux/time.h:6,
                    from include/linux/stat.h:19,
                    from include/linux/fcntl.h:5,
                    from fs/notify//fanotify/fanotify_user.c:3:
   include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 6 has type 'size_t {aka unsigned int}' [-Wformat=]
    #define KERN_SOH "\001"  /* ASCII Start Of Header */
                     ^
   include/linux/printk.h:137:10: note: in definition of macro 'no_printk'
      printk(fmt, ##__VA_ARGS__);  \
             ^~~
   include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
    #define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
                       ^~~~~~~~
   include/linux/printk.h:341:12: note: in expansion of macro 'KERN_DEBUG'
     no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
               ^~~~~~~~~~
   fs/notify//fanotify/fanotify_user.c:238:2: note: in expansion of macro 'pr_debug'
     pr_debug("%s: fh_len=%lu name_len=%lu, info_len=%lu, count=%lu\n",
     ^~~~~~~~
   fs/notify//fanotify/fanotify_user.c:238:63: note: format string is defined here
     pr_debug("%s: fh_len=%lu name_len=%lu, info_len=%lu, count=%lu\n",

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  

:::::: The code at line 5 was first introduced by commit
:::::: 04d2c8c83d0e3ac5f78aeede51babb3236200112 printk: convert the format for KERN_<LEVEL> to a 2 byte pattern

:::::: TO: Joe Perches <joe@perches.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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