[rcu:rcu/next 38/38] arch/x86//kernel/traps.c:105:3: error: implicit declaration of function 'rcu_nmi_enter'

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next
head:   45723bfaf78f78e83e0949895a173ce08cb6ac47
commit: 45723bfaf78f78e83e0949895a173ce08cb6ac47 [38/38] rcu: Consolidate rcu_nmi_{enter,exit}() into rcu_irq_{enter,exit}()
config: x86_64-acpi-redef (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 45723bfaf78f78e83e0949895a173ce08cb6ac47
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   arch/x86//kernel/traps.c: In function 'ist_enter':
>> arch/x86//kernel/traps.c:105:3: error: implicit declaration of function 'rcu_nmi_enter' [-Werror=implicit-function-declaration]
      rcu_nmi_enter();
      ^~~~~~~~~~~~~
   arch/x86//kernel/traps.c: In function 'ist_exit':
>> arch/x86//kernel/traps.c:119:3: error: implicit declaration of function 'rcu_nmi_exit' [-Werror=implicit-function-declaration]
      rcu_nmi_exit();
      ^~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/rcu_nmi_enter +105 arch/x86//kernel/traps.c

be716615 Thomas Gleixner  2009-01-13   87  
aaee8c3c Andy Lutomirski  2016-05-24   88  /*
aaee8c3c Andy Lutomirski  2016-05-24   89   * In IST context, we explicitly disable preemption.  This serves two
aaee8c3c Andy Lutomirski  2016-05-24   90   * purposes: it makes it much less likely that we would accidentally
aaee8c3c Andy Lutomirski  2016-05-24   91   * schedule in IST context and it will force a warning if we somehow
aaee8c3c Andy Lutomirski  2016-05-24   92   * manage to schedule by accident.
aaee8c3c Andy Lutomirski  2016-05-24   93   */
8c84014f Andy Lutomirski  2015-07-03   94  void ist_enter(struct pt_regs *regs)
95927475 Andy Lutomirski  2014-11-19   95  {
f39b6f0e Andy Lutomirski  2015-03-18   96  	if (user_mode(regs)) {
5778077d Linus Torvalds   2015-09-01   97  		RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU");
95927475 Andy Lutomirski  2014-11-19   98  	} else {
95927475 Andy Lutomirski  2014-11-19   99  		/*
95927475 Andy Lutomirski  2014-11-19  100  		 * We might have interrupted pretty much anything.  In
95927475 Andy Lutomirski  2014-11-19  101  		 * fact, if we're a machine check, we can even interrupt
95927475 Andy Lutomirski  2014-11-19  102  		 * NMI processing.  We don't want in_nmi() to return true,
95927475 Andy Lutomirski  2014-11-19  103  		 * but we need to notify RCU.
95927475 Andy Lutomirski  2014-11-19  104  		 */
95927475 Andy Lutomirski  2014-11-19 @105  		rcu_nmi_enter();
95927475 Andy Lutomirski  2014-11-19  106  	}
b926e6f6 Andy Lutomirski  2015-01-31  107  
aaee8c3c Andy Lutomirski  2016-05-24  108  	preempt_disable();
b926e6f6 Andy Lutomirski  2015-01-31  109  
b926e6f6 Andy Lutomirski  2015-01-31  110  	/* This code is a bit fragile.  Test it. */
f78f5b90 Paul E. McKenney 2015-06-18  111  	RCU_LOCKDEP_WARN(!rcu_is_watching(), "ist_enter didn't work");
95927475 Andy Lutomirski  2014-11-19  112  }
95927475 Andy Lutomirski  2014-11-19  113  
8c84014f Andy Lutomirski  2015-07-03  114  void ist_exit(struct pt_regs *regs)
95927475 Andy Lutomirski  2014-11-19  115  {
aaee8c3c Andy Lutomirski  2016-05-24  116  	preempt_enable_no_resched();
95927475 Andy Lutomirski  2014-11-19  117  
8c84014f Andy Lutomirski  2015-07-03  118  	if (!user_mode(regs))
95927475 Andy Lutomirski  2014-11-19 @119  		rcu_nmi_exit();
95927475 Andy Lutomirski  2014-11-19  120  }
95927475 Andy Lutomirski  2014-11-19  121  

:::::: The code at line 105 was first introduced by commit
:::::: 959274753857efe9c5f1ba35fe727f51e9aa128d x86, traps: Track entry into and exit from IST context

:::::: TO: Andy Lutomirski <luto@amacapital.net>
:::::: CC: Andy Lutomirski <luto@amacapital.net>

---
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