[mips-sjhill:mips-for-linux-next 22/28] arch/mips/kernel/smp-cps.c:446:8: error: implicit declaration of function 'cpu_report_death'

[kbuild test robot <fengguang.wu@xxxxxxxxx>]

tree:   git://git.linux-mips.org/pub/scm/sjhill/linux-sjhill.git mips-for-linux-next
head:   fc048e96ed2825cfa8b71d40cfdef842b8ea59d6
commit: d0f801e14727763aadf85618917c77759fec6f81 [22/28] MIPS: Use common outgoing-CPU-notification code
config: mips-64r6el_defconfig (attached as .config)
compiler: mips64el-linux-gnuabi64-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout d0f801e14727763aadf85618917c77759fec6f81
        # save the attached .config to linux build tree
        make.cross ARCH=mips 

All errors (new ones prefixed by >>):

   arch/mips/kernel/smp-cps.c: In function 'play_dead':
>> arch/mips/kernel/smp-cps.c:446:8: error: implicit declaration of function 'cpu_report_death' [-Werror=implicit-function-declaration]
     (void)cpu_report_death();
           ^~~~~~~~~~~~~~~~
   arch/mips/kernel/smp-cps.c: In function 'cps_cpu_die':
>> arch/mips/kernel/smp-cps.c:495:7: error: implicit declaration of function 'cpu_wait_death' [-Werror=implicit-function-declaration]
     if (!cpu_wait_death(cpu, 5)) {
          ^~~~~~~~~~~~~~
   cc1: all warnings being treated as errors

vim +/cpu_report_death +446 arch/mips/kernel/smp-cps.c

   440				cpu_death = CPU_DEATH_HALT;
   441				break;
   442			}
   443		}
   444	
   445		/* This CPU has chosen its way out */
 > 446		(void)cpu_report_death();
   447	
   448		if (cpu_death == CPU_DEATH_HALT) {
   449			vpe_id = cpu_vpe_id(&cpu_data[cpu]);
   450	
   451			pr_debug("Halting core %d VP%d\n", core, vpe_id);
   452			if (cpu_has_mipsmt) {
   453				/* Halt this TC */
   454				write_c0_tchalt(TCHALT_H);
   455				instruction_hazard();
   456			} else if (cpu_has_vp) {
   457				write_cpc_cl_vp_stop(1 << vpe_id);
   458	
   459				/* Ensure that the VP_STOP register is written */
   460				wmb();
   461			}
   462		} else {
   463			pr_debug("Gating power to core %d\n", core);
   464			/* Power down the core */
   465			cps_pm_enter_state(CPS_PM_POWER_GATED);
   466		}
   467	
   468		/* This should never be reached */
   469		panic("Failed to offline CPU %u", cpu);
   470	}
   471	
   472	static void wait_for_sibling_halt(void *ptr_cpu)
   473	{
   474		unsigned cpu = (unsigned long)ptr_cpu;
   475		unsigned vpe_id = cpu_vpe_id(&cpu_data[cpu]);
   476		unsigned halted;
   477		unsigned long flags;
   478	
   479		do {
   480			local_irq_save(flags);
   481			settc(vpe_id);
   482			halted = read_tc_c0_tchalt();
   483			local_irq_restore(flags);
   484		} while (!(halted & TCHALT_H));
   485	}
   486	
   487	static void cps_cpu_die(unsigned int cpu)
   488	{
   489		unsigned core = cpu_data[cpu].core;
   490		unsigned int vpe_id = cpu_vpe_id(&cpu_data[cpu]);
   491		unsigned stat;
   492		int err;
   493	
   494		/* Wait for the cpu to choose its way out */
 > 495		if (!cpu_wait_death(cpu, 5)) {
   496			pr_err("CPU%u: didn't offline\n", cpu);
   497			return;
   498		}

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