[tip:perf/core 36/37] kernel/events/core.c:2856:8: error: implicit declaration of function 'modify_user_hw_breakpoint_check'; did you mean 'modify_user_hw_breakpoint'?

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf/core
head:   5acc575fec9f424f0b557844dbda8aed57baae1e
commit: f30b09b7f8aed3180d6e2f2984e32e91c7a7fcd1 [36/37] perf/core: Implement fast breakpoint modification via _IOC_MODIFY_ATTRIBUTES
config: sparc64-allmodconfig (attached as .config)
compiler: sparc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout f30b09b7f8aed3180d6e2f2984e32e91c7a7fcd1
        # save the attached .config to linux build tree
        make.cross ARCH=sparc64 

All errors (new ones prefixed by >>):

   kernel/events/core.c: In function 'perf_event_modify_breakpoint':
>> kernel/events/core.c:2856:8: error: implicit declaration of function 'modify_user_hw_breakpoint_check'; did you mean 'modify_user_hw_breakpoint'? [-Werror=implicit-function-declaration]
     err = modify_user_hw_breakpoint_check(bp, attr, true);
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
           modify_user_hw_breakpoint
   cc1: some warnings being treated as errors

vim +2856 kernel/events/core.c

  2848	
  2849	static int perf_event_modify_breakpoint(struct perf_event *bp,
  2850						 struct perf_event_attr *attr)
  2851	{
  2852		int err;
  2853	
  2854		_perf_event_disable(bp);
  2855	
> 2856		err = modify_user_hw_breakpoint_check(bp, attr, true);
  2857		if (err) {
  2858			if (!bp->attr.disabled)
  2859				_perf_event_enable(bp);
  2860	
  2861			return err;
  2862		}
  2863	
  2864		if (!attr->disabled)
  2865			_perf_event_enable(bp);
  2866		return 0;
  2867	}
  2868	

---
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