[pm:bleeding-edge 184/195] drivers//acpi/processor_idle.c:854:3: error: implicit declaration of function 'cpuidle_poll_state_init'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git bleeding-edge
head:   98745c58a5f77fbdf1d602b5241f4eca2072d4df
commit: ae26accf539b4fef8febb60d67d345fed00df834 [184/195] cpuidle: Make drivers initialize polling state
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 6.2.0
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout ae26accf539b4fef8febb60d67d345fed00df834
        # save the attached .config to linux build tree
        make.cross ARCH=ia64 

All errors (new ones prefixed by >>):

   drivers//acpi/processor_idle.c: In function 'acpi_processor_setup_cstates':
>> drivers//acpi/processor_idle.c:854:3: error: implicit declaration of function 'cpuidle_poll_state_init' [-Werror=implicit-function-declaration]
      cpuidle_poll_state_init(drv);
      ^~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/cpuidle_poll_state_init +854 drivers//acpi/processor_idle.c

   842	
   843	static int acpi_processor_setup_cstates(struct acpi_processor *pr)
   844	{
   845		int i, count;
   846		struct acpi_processor_cx *cx;
   847		struct cpuidle_state *state;
   848		struct cpuidle_driver *drv = &acpi_idle_driver;
   849	
   850		if (max_cstate == 0)
   851			max_cstate = 1;
   852	
   853		if (IS_ENABLED(CONFIG_ARCH_HAS_CPU_RELAX)) {
 > 854			cpuidle_poll_state_init(drv);
   855			count = 1;
   856		} else {
   857			count = 0;
   858		}
   859	
   860		for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
   861			cx = &pr->power.states[i];
   862	
   863			if (!cx->valid)
   864				continue;
   865	
   866			state = &drv->states[count];
   867			snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i);
   868			strlcpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
   869			state->exit_latency = cx->latency;
   870			state->target_residency = cx->latency * latency_factor;
   871			state->enter = acpi_idle_enter;
   872	
   873			state->flags = 0;
   874			if (cx->type == ACPI_STATE_C1 || cx->type == ACPI_STATE_C2) {
   875				state->enter_dead = acpi_idle_play_dead;
   876				drv->safe_state_index = count;
   877			}
   878			/*
   879			 * Halt-induced C1 is not good for ->enter_freeze, because it
   880			 * re-enables interrupts on exit.  Moreover, C1 is generally not
   881			 * particularly interesting from the suspend-to-idle angle, so
   882			 * avoid C1 and the situations in which we may need to fall back
   883			 * to it altogether.
   884			 */
   885			if (cx->type != ACPI_STATE_C1 && !acpi_idle_fallback_to_c1(pr))
   886				state->enter_freeze = acpi_idle_enter_freeze;
   887	
   888			count++;
   889			if (count == CPUIDLE_STATE_MAX)
   890				break;
   891		}
   892	
   893		drv->state_count = count;
   894	
   895		if (!count)
   896			return -EINVAL;
   897	
   898		return 0;
   899	}
   900	

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