[linux-nvme:nvme-6.18 4/11] 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'}

[kernel test robot]

tree:   git://git.infradead.org/nvme.git nvme-6.18
head:   876f5e3e3b1e3e78aec9b7e53bec4b949a13ce09
commit: 2907c26f418da9a46deae686598e3006958fb1c5 [4/11] nvme-keyring: add 'dhchap' key type
config: arc-randconfig-001-20250930 (https://download.01.org/0day-ci/archive/20250930/202509302151.WHyjRfcE-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 9.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250930/202509302151.WHyjRfcE-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202509302151.WHyjRfcE-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/asm-generic/bug.h:22,
                    from arch/arc/include/asm/bug.h:30,
                    from include/linux/bug.h:5,
                    from include/linux/thread_info.h:13,
                    from include/asm-generic/preempt.h:5,
                    from ./arch/arc/include/generated/asm/preempt.h:1,
                    from include/linux/preempt.h:79,
                    from include/linux/spinlock.h:56,
                    from include/linux/mmzone.h:8,
                    from include/linux/gfp.h:7,
                    from include/linux/umh.h:4,
                    from include/linux/kmod.h:9,
                    from include/linux/module.h:18,
                    from drivers/nvme/common/keyring.c:6:
   drivers/nvme/common/keyring.c: In function 'nvme_dhchap_psk_preparse':
>> 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=]
       5 | #define KERN_SOH "\001"  /* ASCII Start Of Header */
         |                  ^~~~~~
   include/linux/printk.h:135:11: note: in definition of macro 'no_printk'
     135 |   _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:644:12: note: in expansion of macro 'KERN_DEBUG'
     644 |  no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
         |            ^~~~~~~~~~
   drivers/nvme/common/keyring.c:343:3: note: in expansion of macro 'pr_debug'
     343 |   pr_debug("%s: Invalid data length %lu\n", __func__, datalen);
         |   ^~~~~~~~
   drivers/nvme/common/keyring.c:343:39: note: format string is defined here
     343 |   pr_debug("%s: Invalid data length %lu\n", __func__, datalen);
         |                                     ~~^
         |                                       |
         |                                       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  

:::::: 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 at perches.com>
:::::: CC: Linus Torvalds <torvalds at linux-foundation.org>

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