kernel//trace/trace_irqsoff.c:855:2: error: implicit declaration of function 'trace_preempt_enable_rcuidle'

[kbuild test robot <fengguang.wu@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   4fbd8d194f06c8a3fd2af1ce560ddb31f7ec8323
commit: d59158162e032917a428704160a2063a02405ec6 tracing: Add support for preempt and irq enable/disable events
date:   7 weeks ago
config: x86_64-randconfig-s0-11281312 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        git checkout d59158162e032917a428704160a2063a02405ec6
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   kernel//trace/trace_irqsoff.c: In function 'trace_preempt_on':
>> kernel//trace/trace_irqsoff.c:855:2: error: implicit declaration of function 'trace_preempt_enable_rcuidle' [-Werror=implicit-function-declaration]
     trace_preempt_enable_rcuidle(a0, a1);
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel//trace/trace_irqsoff.c: In function 'trace_preempt_off':
>> kernel//trace/trace_irqsoff.c:861:2: error: implicit declaration of function 'trace_preempt_disable_rcuidle' [-Werror=implicit-function-declaration]
     trace_preempt_disable_rcuidle(a0, a1);
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/trace_preempt_enable_rcuidle +855 kernel//trace/trace_irqsoff.c

   850	
   851	#if defined(CONFIG_PREEMPT_TRACER) || \
   852		(defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_PREEMPTIRQ_EVENTS))
   853	void trace_preempt_on(unsigned long a0, unsigned long a1)
   854	{
 > 855		trace_preempt_enable_rcuidle(a0, a1);
   856		tracer_preempt_on(a0, a1);
   857	}
   858	
   859	void trace_preempt_off(unsigned long a0, unsigned long a1)
   860	{
 > 861		trace_preempt_disable_rcuidle(a0, a1);

---
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