linux-ext4 - [tytso-ext4:dev 25/37] fs/ext4/extents-test.c:299:19: warning: format '%ld' expects argument of type 'long int', but argument 4 has type 'int'

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Message-ID: <202601190600.xYVh1uKf-lkp@intel.com>
Date: Mon, 19 Jan 2026 06:09:58 +0800
From: kernel test robot <lkp@...el.com>
To: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-ext4@...r.kernel.org,
 "Theodore Ts'o" <tytso@....edu>, Jan Kara <jack@...e.cz>
Subject: [tytso-ext4:dev 25/37] fs/ext4/extents-test.c:299:19:
 warning: format '%ld' expects argument of type 'long int', but argument 4 has
 type 'int'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev
head:   11f1ff3cc21a8e9ca9f509a664de5975469ec561
commit: 16bbdb54f49e58d51dbf2217bab9ed424172ea9a [25/37] ext4: kunit tests for extent splitting and conversion
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20260119/202601190600.xYVh1uKf-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260119/202601190600.xYVh1uKf-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601190600.xYVh1uKf-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/asm-generic/bug.h:31,
                    from arch/m68k/include/asm/bug.h:32,
                    from include/linux/bug.h:5,
                    from include/linux/random.h:6,
                    from include/linux/nodemask.h:94,
                    from include/linux/list_lru.h:12,
                    from include/linux/fs/super_types.h:7,
                    from include/linux/fs/super.h:5,
                    from include/linux/fs.h:5,
                    from fs/ext4/extents.c:20:
   fs/ext4/extents-test.c: In function 'check_buffer':
   include/linux/kern_levels.h:5:25: warning: format '%ld' expects argument of type 'long int', but argument 3 has type 'int' [-Wformat=]
       5 | #define KERN_SOH        "\001"          /* ASCII Start Of Header */
         |                         ^~~~~~
   include/linux/printk.h:484:25: note: in definition of macro 'printk_index_wrap'
     484 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
         |                         ^~~~
   include/kunit/test.h:661:17: note: in expansion of macro 'printk'
     661 |                 printk(lvl fmt, ##__VA_ARGS__);                         \
         |                 ^~~~~~
   fs/ext4/extents-test.c:298:9: note: in expansion of macro 'kunit_log'
     298 |         kunit_log(KERN_ALERT, kunit_get_current_test(),
         |         ^~~~~~~~~
   include/linux/kern_levels.h:9:25: note: in expansion of macro 'KERN_SOH'
       9 | #define KERN_ALERT      KERN_SOH "1"    /* action must be taken immediately */
         |                         ^~~~~~~~
   fs/ext4/extents-test.c:298:19: note: in expansion of macro 'KERN_ALERT'
     298 |         kunit_log(KERN_ALERT, kunit_get_current_test(),
         |                   ^~~~~~~~~~
   In file included from include/kunit/static_stub.h:18,
                    from fs/ext4/extents.c:35:
>> fs/ext4/extents-test.c:299:19: warning: format '%ld' expects argument of type 'long int', but argument 4 has type 'int' [-Wformat=]
     299 |                   "# %s: wrong char found at offset %ld (expected:%d got:%d)", __func__,
         |                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     300 |                   ((char *)ret - buf), c, *((char *)ret));
         |                   ~~~~~~~~~~~~~~~~~~~
         |                                |
         |                                int
   include/kunit/test.h:662:57: note: in definition of macro 'kunit_log'
     662 |                 kunit_log_append((test_or_suite)->log,  fmt,            \
         |                                                         ^~~
   In file included from fs/ext4/extents.c:6200:
   fs/ext4/extents-test.c:299:55: note: format string is defined here
     299 |                   "# %s: wrong char found at offset %ld (expected:%d got:%d)", __func__,
         |                                                     ~~^
         |                                                       |
         |                                                       long int
         |                                                     %d


vim +299 fs/ext4/extents-test.c

   286	
   287	/*
   288	 * Return 1 if all bytes in the buf equal to c, else return the offset of first mismatch
   289	 */
   290	static int check_buffer(char *buf, int c, int size)
   291	{
   292		void *ret = NULL;
   293	
   294		ret = memchr_inv(buf, c, size);
   295		if (ret  == NULL)
   296			return 0;
   297	
   298		kunit_log(KERN_ALERT, kunit_get_current_test(),
 > 299			  "# %s: wrong char found at offset %ld (expected:%d got:%d)", __func__,
   300			  ((char *)ret - buf), c, *((char *)ret));
   301		return 1;
   302	}
   303	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki