[tip:core/urgent 2/3] kernel/watchdog_hld.c:232:11: error: 'dead_event_ev' undeclared

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core/urgent
head:   c7254c8aabe3025770fdb6f2d84aded11716ca2b
commit: 1c294733b7b9f712f78d15cfa75ffdea72b79abb [2/3] watchdog/harclockup/perf: Revert a33d44843d45 ("watchdog/hardlockup/perf: Simplify deferred event destroy")
config: x86_64-randconfig-x018-201744 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 1c294733b7b9f712f78d15cfa75ffdea72b79abb
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All error/warnings (new ones prefixed by >>):

   In file included from include/asm-generic/percpu.h:6:0,
                    from arch/x86/include/asm/percpu.h:542,
                    from arch/x86/include/asm/current.h:5,
                    from include/linux/sched.h:11,
                    from include/linux/nmi.h:7,
                    from kernel/watchdog_hld.c:14:
   kernel/watchdog_hld.c: In function 'hardlockup_detector_perf_cleanup':
>> kernel/watchdog_hld.c:232:11: error: 'dead_event_ev' undeclared (first use in this function)
      per_cpu(dead_event_ev, cpu) = NULL;
              ^
   include/linux/percpu-defs.h:206:47: note: in definition of macro '__verify_pcpu_ptr'
     const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL; \
                                                  ^~~
   include/linux/percpu-defs.h:256:29: note: in expansion of macro 'per_cpu_ptr'
    #define per_cpu(var, cpu) (*per_cpu_ptr(&(var), cpu))
                                ^~~~~~~~~~~
>> kernel/watchdog_hld.c:232:3: note: in expansion of macro 'per_cpu'
      per_cpu(dead_event_ev, cpu) = NULL;
      ^~~~~~~
   kernel/watchdog_hld.c:232:11: note: each undeclared identifier is reported only once for each function it appears in
      per_cpu(dead_event_ev, cpu) = NULL;
              ^
   include/linux/percpu-defs.h:206:47: note: in definition of macro '__verify_pcpu_ptr'
     const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL; \
                                                  ^~~
   include/linux/percpu-defs.h:256:29: note: in expansion of macro 'per_cpu_ptr'
    #define per_cpu(var, cpu) (*per_cpu_ptr(&(var), cpu))
                                ^~~~~~~~~~~
>> kernel/watchdog_hld.c:232:3: note: in expansion of macro 'per_cpu'
      per_cpu(dead_event_ev, cpu) = NULL;
      ^~~~~~~

vim +/dead_event_ev +232 kernel/watchdog_hld.c

   213	
   214	/**
   215	 * hardlockup_detector_perf_cleanup - Cleanup disabled events and destroy them
   216	 *
   217	 * Called from lockup_detector_cleanup(). Serialized by the caller.
   218	 */
   219	void hardlockup_detector_perf_cleanup(void)
   220	{
   221		int cpu;
   222	
   223		for_each_cpu(cpu, &dead_events_mask) {
   224			struct perf_event *event = per_cpu(dead_event, cpu);
   225	
   226			/*
   227			 * Required because for_each_cpu() reports  unconditionally
   228			 * CPU0 as set on UP kernels. Sigh.
   229			 */
   230			if (event)
   231				perf_event_release_kernel(event);
 > 232			per_cpu(dead_event_ev, cpu) = NULL;
   233		}
   234		cpumask_clear(&dead_events_mask);
   235	}
   236	

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