Re: [PATCH 17/70] cpufreq: interactive: take idle notifications only when active

[kbuild test robot]

Hi Sam,

[auto build test ERROR on pm/linux-next -- if it's inappropriate base, please suggest rules for selecting the more suitable base]

url:    https://github.com/0day-ci/linux/commits/B-lint-Czobor/cpufreq-interactive-New-interactive-governor/20151028-020715
config: sparc64-allyesconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=sparc64 

All errors (new ones prefixed by >>):

   drivers/cpufreq/cpufreq_interactive.c: In function 'store_hispeed_freq':
   drivers/cpufreq/cpufreq_interactive.c:637:2: error: implicit declaration of function 'strict_strtoull' [-Werror=implicit-function-declaration]
     ret = strict_strtoull(buf, 0, &val);
     ^
   drivers/cpufreq/cpufreq_interactive.c: In function 'store_go_hispeed_load':
   drivers/cpufreq/cpufreq_interactive.c:660:2: error: implicit declaration of function 'strict_strtoul' [-Werror=implicit-function-declaration]
     ret = strict_strtoul(buf, 0, &val);
     ^
   drivers/cpufreq/cpufreq_interactive.c: In function 'cpufreq_interactive_idle_notifier':
   drivers/cpufreq/cpufreq_interactive.c:827:7: error: 'IDLE_START' undeclared (first use in this function)
     case IDLE_START:
          ^
   drivers/cpufreq/cpufreq_interactive.c:827:7: note: each undeclared identifier is reported only once for each function it appears in
   drivers/cpufreq/cpufreq_interactive.c:830:7: error: 'IDLE_END' undeclared (first use in this function)
     case IDLE_END:
          ^
   drivers/cpufreq/cpufreq_interactive.c: In function 'cpufreq_governor_interactive':
   drivers/cpufreq/cpufreq_interactive.c:895:3: error: implicit declaration of function 'idle_notifier_register' [-Werror=implicit-function-declaration]
      idle_notifier_register(&cpufreq_interactive_idle_nb);
      ^
>> drivers/cpufreq/cpufreq_interactive.c:918:3: error: implicit declaration of function 'idle_notifier_unregister' [-Werror=implicit-function-declaration]
      idle_notifier_unregister(&cpufreq_interactive_idle_nb);
      ^
   cc1: some warnings being treated as errors

vim +/idle_notifier_unregister +918 drivers/cpufreq/cpufreq_interactive.c

   821	
   822	static int cpufreq_interactive_idle_notifier(struct notifier_block *nb,
   823						     unsigned long val,
   824						     void *data)
   825	{
   826		switch (val) {
 > 827		case IDLE_START:
   828			cpufreq_interactive_idle_start();
   829			break;
   830		case IDLE_END:
   831			cpufreq_interactive_idle_end();
   832			break;
   833		}
   834	
   835		return 0;
   836	}
   837	
   838	static struct notifier_block cpufreq_interactive_idle_nb = {
   839		.notifier_call = cpufreq_interactive_idle_notifier,
   840	};
   841	
   842	static int cpufreq_governor_interactive(struct cpufreq_policy *policy,
   843			unsigned int event)
   844	{
   845		int rc;
   846		unsigned int j;
   847		struct cpufreq_interactive_cpuinfo *pcpu;
   848		struct cpufreq_frequency_table *freq_table;
   849	
   850		switch (event) {
   851		case CPUFREQ_GOV_START:
   852			if (!cpu_online(policy->cpu))
   853				return -EINVAL;
   854	
   855			freq_table =
   856				cpufreq_frequency_get_table(policy->cpu);
   857	
   858			for_each_cpu(j, policy->cpus) {
   859				pcpu = &per_cpu(cpuinfo, j);
   860				pcpu->policy = policy;
   861				pcpu->target_freq = policy->cur;
   862				pcpu->freq_table = freq_table;
   863				pcpu->target_set_time_in_idle =
   864					get_cpu_idle_time_us(j,
   865						     &pcpu->target_set_time);
   866				pcpu->floor_freq = pcpu->target_freq;
   867				pcpu->floor_validate_time =
   868					pcpu->target_set_time;
   869				pcpu->hispeed_validate_time =
   870					pcpu->target_set_time;
   871				pcpu->governor_enabled = 1;
   872				smp_wmb();
   873			}
   874	
   875			if (!hispeed_freq)
   876				hispeed_freq = policy->max;
   877	
   878			/*
   879			 * Do not register the idle hook and create sysfs
   880			 * entries if we have already done so.
   881			 */
   882			if (atomic_inc_return(&active_count) > 1)
   883				return 0;
   884	
   885			rc = sysfs_create_group(cpufreq_global_kobject,
   886					&interactive_attr_group);
   887			if (rc)
   888				return rc;
   889	
   890			rc = input_register_handler(&cpufreq_interactive_input_handler);
   891			if (rc)
   892				pr_warn("%s: failed to register input handler\n",
   893					__func__);
   894	
   895			idle_notifier_register(&cpufreq_interactive_idle_nb);
   896			break;
   897	
   898		case CPUFREQ_GOV_STOP:
   899			for_each_cpu(j, policy->cpus) {
   900				pcpu = &per_cpu(cpuinfo, j);
   901				pcpu->governor_enabled = 0;
   902				smp_wmb();
   903				del_timer_sync(&pcpu->cpu_timer);
   904	
   905				/*
   906				 * Reset idle exit time since we may cancel the timer
   907				 * before it can run after the last idle exit time,
   908				 * to avoid tripping the check in idle exit for a timer
   909				 * that is trying to run.
   910				 */
   911				pcpu->idle_exit_time = 0;
   912			}
   913	
   914			flush_work(&freq_scale_down_work);
   915			if (atomic_dec_return(&active_count) > 0)
   916				return 0;
   917	
 > 918			idle_notifier_unregister(&cpufreq_interactive_idle_nb);
   919			input_unregister_handler(&cpufreq_interactive_input_handler);
   920			sysfs_remove_group(cpufreq_global_kobject,
   921					&interactive_attr_group);

---
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