[tip:WIP.core/stacktrace 37/47] kernel/locking/lockdep.c:2806:2: error: implicit declaration of function 'print_lock_trace'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.core/stacktrace
head:   63c35ea6b829a0f98d307a8dec038095681ecd13
commit: 88e5708cae1e9cb0cca97bb0af5866ac54532ceb [37/47] lockdep: Simplify stack trace handling
config: x86_64-randconfig-l2-201915 (attached as .config)
compiler: gcc-5 (Debian 5.5.0-3) 5.4.1 20171010
reproduce:
        git checkout 88e5708cae1e9cb0cca97bb0af5866ac54532ceb
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   kernel/locking/lockdep.c: In function 'print_usage_bug':
>> kernel/locking/lockdep.c:2806:2: error: implicit declaration of function 'print_lock_trace' [-Werror=implicit-function-declaration]
     print_lock_trace(hlock_class(this)->usage_traces + prev_bit, 1);
     ^
   cc1: some warnings being treated as errors

vim +/print_lock_trace +2806 kernel/locking/lockdep.c

  2780	
  2781	static int
  2782	print_usage_bug(struct task_struct *curr, struct held_lock *this,
  2783			enum lock_usage_bit prev_bit, enum lock_usage_bit new_bit)
  2784	{
  2785		if (!debug_locks_off_graph_unlock() || debug_locks_silent)
  2786			return 0;
  2787	
  2788		pr_warn("\n");
  2789		pr_warn("================================\n");
  2790		pr_warn("WARNING: inconsistent lock state\n");
  2791		print_kernel_ident();
  2792		pr_warn("--------------------------------\n");
  2793	
  2794		pr_warn("inconsistent {%s} -> {%s} usage.\n",
  2795			usage_str[prev_bit], usage_str[new_bit]);
  2796	
  2797		pr_warn("%s/%d [HC%u[%lu]:SC%u[%lu]:HE%u:SE%u] takes:\n",
  2798			curr->comm, task_pid_nr(curr),
  2799			trace_hardirq_context(curr), hardirq_count() >> HARDIRQ_SHIFT,
  2800			trace_softirq_context(curr), softirq_count() >> SOFTIRQ_SHIFT,
  2801			trace_hardirqs_enabled(curr),
  2802			trace_softirqs_enabled(curr));
  2803		print_lock(this);
  2804	
  2805		pr_warn("{%s} state was registered at:\n", usage_str[prev_bit]);
> 2806		print_lock_trace(hlock_class(this)->usage_traces + prev_bit, 1);
  2807	
  2808		print_irqtrace_events(curr);
  2809		pr_warn("\nother info that might help us debug this:\n");
  2810		print_usage_bug_scenario(this);
  2811	
  2812		lockdep_print_held_locks(curr);
  2813	
  2814		pr_warn("\nstack backtrace:\n");
  2815		dump_stack();
  2816	
  2817		return 0;
  2818	}
  2819	

---
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