[linux-next:master 10174/10581] include/linux/kern_levels.h:5:18: warning: format '%zu' expects argument of type 'size_t', but argument 4 has type 'long unsigned int'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   671176b0016c80b3943cb5387312c886aba3308d
commit: 1d881c0431850a197c9164c4b8009b48481b9263 [10174/10581] mm: cma: print region name on failure
config: microblaze-randconfig-r021-20210212 (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://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=1d881c0431850a197c9164c4b8009b48481b9263
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 1d881c0431850a197c9164c4b8009b48481b9263
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=microblaze 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All warnings (new ones prefixed by >>):

   In file included from include/linux/printk.h:7,
                    from include/linux/kernel.h:16,
                    from include/asm-generic/bug.h:20,
                    from ./arch/microblaze/include/generated/asm/bug.h:1,
                    from include/linux/bug.h:5,
                    from include/linux/mmdebug.h:5,
                    from include/linux/mm.h:9,
                    from include/linux/memblock.h:13,
                    from mm/cma.c:24:
   mm/cma.c: In function 'cma_alloc':

quoted

include/linux/kern_levels.h:5:18: warning: format '%zu' expects argument of type 'size_t', but argument 4 has type 'long unsigned int' [-Wformat=]

       5 | #define KERN_SOH "\001"  /* ASCII Start Of Header */
         |                  ^~~~~~
   include/linux/kern_levels.h:11:18: note: in expansion of macro 'KERN_SOH'
      11 | #define KERN_ERR KERN_SOH "3" /* error conditions */
         |                  ^~~~~~~~
   include/linux/printk.h:343:9: note: in expansion of macro 'KERN_ERR'
     343 |  printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
         |         ^~~~~~~~
   mm/cma.c:503:3: note: in expansion of macro 'pr_err'
     503 |   pr_err("%s: %s: alloc failed, req-size: %zu pages, ret: %d\n",
         |   ^~~~~~
   mm/cma.c:503:45: note: format string is defined here
     503 |   pr_err("%s: %s: alloc failed, req-size: %zu pages, ret: %d\n",
         |                                           ~~^
         |                                             |
         |                                             unsigned int
         |                                           %lu


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 [off-list ref]
:::::: CC: Linus Torvalds [off-list ref]

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