[mac80211-next:netlink-policy-export 11/11] include/linux/kern_levels.h:5:18: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'void *'

[mac80211-next:netlink-policy-export 11/11] include/linux/kern_levels.h:5:18: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'void *'

[kbuild test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next.git netlink-policy-export
head:   334240a63c7e6da8be21a0c469751afe72e73ef0
commit: 334240a63c7e6da8be21a0c469751afe72e73ef0 [11/11] netlink: add infrastructure to expose policies to userspace
config: xtensa-allyesconfig (attached as .config)
compiler: xtensa-linux-gcc (GCC) 8.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 334240a63c7e6da8be21a0c469751afe72e73ef0
        # save the attached .config to linux build tree
        GCC_VERSION=8.1.0 make.cross ARCH=xtensa 

All warnings (new ones prefixed by >>):

   In file included from include/linux/printk.h:7,
                    from include/linux/kernel.h:15,
                    from include/linux/list.h:9,
                    from include/linux/module.h:9,
                    from net//netlink/genetlink.c:10:
   net//netlink/genetlink.c: In function 'ctrl_dumppolicy':
>> include/linux/kern_levels.h:5:18: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'void *' [-Wformat=]
    #define KERN_SOH "\001"  /* ASCII Start Of Header */
                     ^~~~~~
   include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
    #define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
                       ^~~~~~~~
   net//netlink/genetlink.c:983:11: note: in expansion of macro 'KERN_DEBUG'
       printk(KERN_DEBUG "find by name '%s'\n", nla_data(tb[CTRL_ATTR_FAMILY_NAME]));
              ^~~~~~~~~~
   net//netlink/genetlink.c:983:38: note: format string is defined here
       printk(KERN_DEBUG "find by name '%s'\n", nla_data(tb[CTRL_ATTR_FAMILY_NAME]));
                                        ~^
                                        %p
--
   In file included from include/linux/printk.h:7,
                    from include/linux/kernel.h:15,
                    from include/linux/list.h:9,
                    from include/linux/module.h:9,
                    from net/netlink/genetlink.c:10:
   net/netlink/genetlink.c: In function 'ctrl_dumppolicy':
>> include/linux/kern_levels.h:5:18: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'void *' [-Wformat=]
    #define KERN_SOH "\001"  /* ASCII Start Of Header */
                     ^~~~~~
   include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
    #define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
                       ^~~~~~~~
   net/netlink/genetlink.c:983:11: note: in expansion of macro 'KERN_DEBUG'
       printk(KERN_DEBUG "find by name '%s'\n", nla_data(tb[CTRL_ATTR_FAMILY_NAME]));
              ^~~~~~~~~~
   net/netlink/genetlink.c:983:38: note: format string is defined here
       printk(KERN_DEBUG "find by name '%s'\n", nla_data(tb[CTRL_ATTR_FAMILY_NAME]));
                                        ~^
                                        %p

vim +5 include/linux/kern_levels.h

314ba352 Joe Perches 2012-07-30  4  
04d2c8c8 Joe Perches 2012-07-30 @5  #define KERN_SOH	"\001"		/* ASCII Start Of Header */
04d2c8c8 Joe Perches 2012-07-30  6  #define KERN_SOH_ASCII	'\001'
04d2c8c8 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 kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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