[chao-linux:dax-wip 7/7] include/linux/kern_levels.h:5:18: warning: format '%s' expects a matching 'char *' argument

[chao-linux:dax-wip 7/7] include/linux/kern_levels.h:5:18: warning: format '%s' expects a matching 'char *' argument

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git dax-wip
head:   030db79112b5bc644a842a966bf839ef71a31245
commit: 030db79112b5bc644a842a966bf839ef71a31245 [7/7] f2fs: dax options
config: mips-allyesconfig (attached as .config)
compiler: mips-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/chao/linux.git/commit/?id=030db79112b5bc644a842a966bf839ef71a31245
        git remote add chao-linux https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git
        git fetch --no-tags chao-linux dax-wip
        git checkout 030db79112b5bc644a842a966bf839ef71a31245
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips 

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/linux/list.h:9,
                    from include/linux/module.h:12,
                    from fs/f2fs/super.c:8:
   fs/f2fs/super.c: In function 'parse_options':
>> include/linux/kern_levels.h:5:18: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
       5 | #define KERN_SOH "\001"  /* ASCII Start Of Header */
         |                  ^~~~~~
   include/linux/kern_levels.h:14:19: note: in expansion of macro 'KERN_SOH'
      14 | #define KERN_INFO KERN_SOH "6" /* informational */
         |                   ^~~~~~~~
   fs/f2fs/f2fs.h:2135:19: note: in expansion of macro 'KERN_INFO'
    2135 |  f2fs_printk(sbi, KERN_INFO fmt, ##__VA_ARGS__)
         |                   ^~~~~~~~~
   fs/f2fs/super.c:1119:4: note: in expansion of macro 'f2fs_info'
    1119 |    f2fs_info(sbi, "dax=%s option not supported");
         |    ^~~~~~~~~
   fs/f2fs/super.c:1119:25: note: format string is defined here
    1119 |    f2fs_info(sbi, "dax=%s option not supported");
         |                        ~^
         |                         |
         |                         char *
   fs/f2fs/super.c: In function 'default_options':
   fs/f2fs/super.c:1903:18: error: 'struct f2fs_mount_info' has no member named 'dax_mode'
    1903 |  F2FS_OPTION(sbi).dax_mode = DAX_MODE_NONE;
         |                  ^


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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