[tip:smp/hotplug 43/44] kernel/tracepoint.c:253:4: error: implicit declaration of function 'static_key_slow_dec_cpuslocked'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git smp/hotplug
head:   8b836972c33553d3ff70954af090debfc9dc84c6
commit: 24db7a671bd5eea76b17138b976eb9a4072f1b7a [43/44] trace/perf: Cure hotplug lock ordering issues
config: blackfin-allmodconfig (attached as .config)
compiler: bfin-uclinux-gcc (GCC) 6.2.0
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 24db7a671bd5eea76b17138b976eb9a4072f1b7a
        # save the attached .config to linux build tree
        make.cross ARCH=blackfin 

All errors (new ones prefixed by >>):

   kernel/tracepoint.c: In function 'tracepoint_remove_func':
>> kernel/tracepoint.c:253:4: error: implicit declaration of function 'static_key_slow_dec_cpuslocked' [-Werror=implicit-function-declaration]
       static_key_slow_dec_cpuslocked(&tp->key);
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/static_key_slow_dec_cpuslocked +253 kernel/tracepoint.c

   247		if (!tp_funcs) {
   248			/* Removed last function */
   249			if (tp->unregfunc && static_key_enabled(&tp->key))
   250				tp->unregfunc();
   251	
   252			if (static_key_enabled(&tp->key))
 > 253				static_key_slow_dec_cpuslocked(&tp->key);
   254		}
   255		rcu_assign_pointer(tp->funcs, tp_funcs);
   256		release_probes(old);

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