[rcu:rcu/next 29/29] kernel/rcu/rcutorture.c:1369:3: error: implicit declaration of function 'srcutorture_get_gp_data'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next
head:   b4d55cac0a93834e7e79143111a0b8ecea49a630
commit: b4d55cac0a93834e7e79143111a0b8ecea49a630 [29/29] srcu: Make rcutorture writer stalls print SRCU GP state
config: x86_64-randconfig-x012-201716 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout b4d55cac0a93834e7e79143111a0b8ecea49a630
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   kernel/rcu/rcutorture.c: In function 'rcu_torture_stats_print':
>> kernel/rcu/rcutorture.c:1369:3: error: implicit declaration of function 'srcutorture_get_gp_data' [-Werror=implicit-function-declaration]
      srcutorture_get_gp_data(cur_ops->ttype, srcu_ctlp,
      ^~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/srcutorture_get_gp_data +1369 kernel/rcu/rcutorture.c

  1363			int __maybe_unused flags = 0;
  1364			unsigned long __maybe_unused gpnum = 0;
  1365			unsigned long __maybe_unused completed = 0;
  1366	
  1367			rcutorture_get_gp_data(cur_ops->ttype,
  1368					       &flags, &gpnum, &completed);
> 1369			srcutorture_get_gp_data(cur_ops->ttype, srcu_ctlp,
  1370						&flags, &gpnum, &completed);
  1371			wtp = READ_ONCE(writer_task);
  1372			pr_alert("??? Writer stall state %s(%d) g%lu c%lu f%#x ->state %#lx\n",

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