linux-kernel - [tip:WIP.hotplug 25/66] arch/x86/events/amd/power.c:292:2: error: implicit declaration of function 'cpuhp_set

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Date:	Mon, 11 Jul 2016 16:34:02 +0800
From:	kbuild test robot <fengguang.wu@...el.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org,
	tipbuild@...or.com, Thomas Gleixner <tglx@...utronix.de>,
	Anna-Maria Gleixner <anna-maria@...utronix.de>
Subject: [tip:WIP.hotplug 25/66] arch/x86/events/amd/power.c:292:2: error:
 implicit declaration of function 'cpuhp_set_state'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.hotplug
head:   0e5de16e9e45b4d853a31761fd74ff56998169a1
commit: a819753cd02cd6d2c88f8d070f94346af5d8a0c2 [25/66] perf/x86/amd/power: Convert the hotplug notifier to state machine
config: i386-allmodconfig (attached as .config)
compiler: gcc-6 (Debian 6.1.1-1) 6.1.1 20160430
reproduce:
        git checkout a819753cd02cd6d2c88f8d070f94346af5d8a0c2
        # save the attached .config to linux build tree
        make ARCH=i386 

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

   arch/x86/events/amd/power.c: In function 'power_cpu_init':
>> arch/x86/events/amd/power.c:267:1: warning: no return statement in function returning non-void [-Wreturn-type]
    }
    ^
   arch/x86/events/amd/power.c: In function 'amd_power_pmu_init':
>> arch/x86/events/amd/power.c:292:2: error: implicit declaration of function 'cpuhp_set_state' [-Werror=implicit-function-declaration]
     cpuhp_set_state(CPUHP_AP_PERF_X86_AMD_POWER_ONLINE,
     ^~~~~~~~~~~~~~~
>> arch/x86/events/amd/power.c:292:18: error: 'CPUHP_AP_PERF_X86_AMD_POWER_ONLINE' undeclared (first use in this function)
     cpuhp_set_state(CPUHP_AP_PERF_X86_AMD_POWER_ONLINE,
                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/x86/events/amd/power.c:292:18: note: each undeclared identifier is reported only once for each function it appears in
>> arch/x86/events/amd/power.c:276:11: warning: unused variable 'target' [-Wunused-variable]
     int cpu, target, ret;
              ^~~~~~
>> arch/x86/events/amd/power.c:276:6: warning: unused variable 'cpu' [-Wunused-variable]
     int cpu, target, ret;
         ^~~
   arch/x86/events/amd/power.c: In function 'amd_power_pmu_exit':
   arch/x86/events/amd/power.c:309:29: error: 'CPUHP_AP_PERF_X86_AMD_POWER_ONLINE' undeclared (first use in this function)
     cpuhp_remove_state_nocalls(CPUHP_AP_PERF_X86_AMD_POWER_ONLINE);
                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/cpuhp_set_state +292 arch/x86/events/amd/power.c

   261		 * Note: if there is a CPU aside of the new one already in the
   262		 * sibling mask, then it is also in cpu_mask.
   263		 */
   264		target = cpumask_any_but(topology_sibling_cpumask(cpu), cpu);
   265		if (target >= nr_cpumask_bits)
   266			cpumask_set_cpu(cpu, &cpu_mask);
 > 267	}
   268	
   269	static const struct x86_cpu_id cpu_match[] = {
   270		{ .vendor = X86_VENDOR_AMD, .family = 0x15 },
   271		{},
   272	};
   273	
   274	static int __init amd_power_pmu_init(void)
   275	{
 > 276		int cpu, target, ret;
   277	
   278		if (!x86_match_cpu(cpu_match))
   279			return 0;
   280	
   281		if (!boot_cpu_has(X86_FEATURE_ACC_POWER))
   282			return -ENODEV;
   283	
   284		cpu_pwr_sample_ratio = cpuid_ecx(0x80000007);
   285	
   286		if (rdmsrl_safe(MSR_F15H_CU_MAX_PWR_ACCUMULATOR, &max_cu_acc_power)) {
   287			pr_err("Failed to read max compute unit power accumulator MSR\n");
   288			return -ENODEV;
   289		}
   290	
   291	
 > 292		cpuhp_set_state(CPUHP_AP_PERF_X86_AMD_POWER_ONLINE,
   293				"AP_PERF_X86_AMD_POWER_ONLINE",
   294				power_cpu_init, power_cpu_exit);
   295	

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