[acpi:release 6/6] arch/x86/kernel/cpu/intel.c:543:2: error: implicit declaration of function 'intel_hwp_init'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux.git release
head:   15b36a4938815f8dbb940b212ecc7c7085a89ca0
commit: 15b36a4938815f8dbb940b212ecc7c7085a89ca0 [6/6] x86: native HWP support
config: i386-randconfig-s1-201545 (attached as .config)
reproduce:
        git checkout 15b36a4938815f8dbb940b212ecc7c7085a89ca0
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   arch/x86/kernel/cpu/intel.c: In function 'init_intel':
>> arch/x86/kernel/cpu/intel.c:543:2: error: implicit declaration of function 'intel_hwp_init' [-Werror=implicit-function-declaration]
     intel_hwp_init();
     ^
   cc1: some warnings being treated as errors

vim +/intel_hwp_init +543 arch/x86/kernel/cpu/intel.c

   537	
   538		if (cpu_has(c, X86_FEATURE_VMX))
   539			detect_vmx_virtcap(c);
   540	
   541		init_intel_energy_perf(c);
   542	
 > 543		intel_hwp_init();
   544	}
   545	
   546	#ifdef CONFIG_X86_32

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