linux-ext4 - Re: [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: <aW5LXG_yhegj1QWT@li-dc0c254c-257c-11b2-a85c-98b6c1322444.ibm.com>
Date: Mon, 19 Jan 2026 20:48:52 +0530
From: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
To: kernel test robot <lkp@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-ext4@...r.kernel.org,
        "Theodore Ts'o" <tytso@....edu>, Jan Kara <jack@...e.cz>
Subject: Re: [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'

On Mon, Jan 19, 2026 at 06:09:58AM +0800, kernel test robot wrote:
> 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__,

Hi,

Thanks for the report, I'll add an explicit cast to 32 bit and fix this.

Thanks,
ojaswin

>    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