Hi Andi,

[auto build test ERROR on asm-generic/master]
[also build test ERROR on v4.7 next-20160802]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Andi-Kleen/Support-resetting-WARN-_ONCE/20160803-112312
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git master
config: xtensa-allmodconfig (attached as .config)
compiler: xtensa-linux-gcc (GCC) 4.9.0
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=xtensa 

All errors (new ones prefixed by >>):

   kernel/panic.c: In function 'clear_warn_once_set':
>> kernel/panic.c:557:9: error: '__start_once' undeclared (first use in this function)
     memset(__start_once, 0, __end_once - __start_once);
            ^
   kernel/panic.c:557:9: note: each undeclared identifier is reported only once for each function it appears in
>> kernel/panic.c:557:26: error: '__end_once' undeclared (first use in this function)
     memset(__start_once, 0, __end_once - __start_once);
                             ^

vim +/__start_once +557 kernel/panic.c

   551	#endif
   552	
   553	/* Support resetting WARN*_ONCE state */
   554	
   555	static int clear_warn_once_set(void *data, u64 val)
   556	{
 > 557		memset(__start_once, 0, __end_once - __start_once);
   558		return 0;
   559	}
   560	

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