[hch-misc:anon_inode 7/9] include/linux/kern_levels.h:5:18: warning: format '%zd' expects argument of type 'signed size_t', but argument 2 has type 'long int'

[hch-misc:anon_inode 7/9] include/linux/kern_levels.h:5:18: warning: format '%zd' expects argument of type 'signed size_t', but argument 2 has type 'long int'

[kernel test robot]

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tree:   git://git.infradead.org/users/hch/misc.git anon_inode
head:   4d64e25e69a59a78e3feefff635836cbe1e8f22f
commit: 7a828a56fd7f441208d079ffa931b00c6b4d5c31 [7/9] iomem: remove the iomem file system
config: m68k-randconfig-r021-20210308 (attached as .config)
compiler: m68k-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
        git remote add hch-misc git://git.infradead.org/users/hch/misc.git
        git fetch --no-tags hch-misc anon_inode
        git checkout 7a828a56fd7f441208d079ffa931b00c6b4d5c31
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k 

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

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/m68k/include/asm/bug.h:32,
                    from include/linux/bug.h:5,
                    from include/linux/mmdebug.h:5,
                    from include/linux/gfp.h:5,
                    from include/linux/slab.h:15,
                    from kernel/resource.c:17:
   kernel/resource.c: In function 'iomem_init_inode':
>> include/linux/kern_levels.h:5:18: warning: format '%zd' expects argument of type 'signed size_t', but argument 2 has type 'long 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__)
         |         ^~~~~~~~
   kernel/resource.c:1845:3: note: in expansion of macro 'pr_err'
    1845 |   pr_err("Cannot allocate inode for iomem: %zd\n", PTR_ERR(inode));
         |   ^~~~~~


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(a)lists.01.org

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