Hi Hari,

[auto build test ERROR on tip/perf/core]
[also build test ERROR on v4.9-rc4]
[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/Hari-Bathini/perf-add-support-for-analyzing-events-for-containers/20161110-195727
config: ia64-allnoconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 6.2.0
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=ia64 

All errors (new ones prefixed by >>):

   kernel/fork.c: In function 'copy_process':
>> kernel/fork.c:1818:2: error: implicit declaration of function 'perf_event_namespaces' [-Werror=implicit-function-declaration]
     perf_event_namespaces(p);
     ^~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors
--
   kernel/nsproxy.c: In function 'SYSC_setns':
>> kernel/nsproxy.c:270:3: error: implicit declaration of function 'perf_event_namespaces' [-Werror=implicit-function-declaration]
      perf_event_namespaces(tsk);
      ^~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/perf_event_namespaces +1818 kernel/fork.c

  1812		write_unlock_irq(&tasklist_lock);
  1813	
  1814		proc_fork_connector(p);
  1815		cgroup_post_fork(p);
  1816		threadgroup_change_end(current);
  1817		perf_event_fork(p);
> 1818		perf_event_namespaces(p);
  1819	
  1820		trace_task_newtask(p, clone_flags);
  1821		uprobe_copy_process(p, clone_flags);

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