[linux-stable-rc:linux-4.19.y 5835/9999] arch/x86/kernel/cpu/mcheck/mce_amd.c:552:6: warning: no previous prototype for function 'disable_err_thresholding'

[linux-stable-rc:linux-4.19.y 5835/9999] arch/x86/kernel/cpu/mcheck/mce_amd.c:552:6: warning: no previous prototype for function 'disable_err_thresholding'

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.19.y
head:   e864f43593ccf9180c61738abdf1c1dde091367d
commit: 938de2324afb53acd20893cd8eec8ee6f80de646 [5835/9999] x86/MCE/AMD: Carve out the MC4_MISC thresholding quirk
config: x86_64-randconfig-r036-20210103 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 7af6a134508cd1c7f75c6e3441ce436f220f30a4)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?id=938de2324afb53acd20893cd8eec8ee6f80de646
        git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
        git fetch --no-tags linux-stable-rc linux-4.19.y
        git checkout 938de2324afb53acd20893cd8eec8ee6f80de646
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> arch/x86/kernel/cpu/mcheck/mce_amd.c:552:6: warning: no previous prototype for function 'disable_err_thresholding' [-Wmissing-prototypes]
   void disable_err_thresholding(struct cpuinfo_x86 *c)
        ^
   arch/x86/kernel/cpu/mcheck/mce_amd.c:552:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void disable_err_thresholding(struct cpuinfo_x86 *c)
   ^
   static 
   1 warning generated.


vim +/disable_err_thresholding +552 arch/x86/kernel/cpu/mcheck/mce_amd.c

   547	
   548	/*
   549	 * Turn off MC4_MISC thresholding banks on all family 0x15 models since
   550	 * they're not supported there.
   551	 */
 > 552	void disable_err_thresholding(struct cpuinfo_x86 *c)
   553	{
   554		int i;
   555		u64 hwcr;
   556		bool need_toggle;
   557		u32 msrs[] = {
   558			0x00000413, /* MC4_MISC0 */
   559			0xc0000408, /* MC4_MISC1 */
   560		};
   561	
   562		if (c->x86 != 0x15)
   563			return;
   564	
   565		rdmsrl(MSR_K7_HWCR, hwcr);
   566	
   567		/* McStatusWrEn has to be set */
   568		need_toggle = !(hwcr & BIT(18));
   569	
   570		if (need_toggle)
   571			wrmsrl(MSR_K7_HWCR, hwcr | BIT(18));
   572	
   573		/* Clear CntP bit safely */
   574		for (i = 0; i < ARRAY_SIZE(msrs); i++)
   575			msr_clear_bit(msrs[i], 62);
   576	
   577		/* restore old settings */
   578		if (need_toggle)
   579			wrmsrl(MSR_K7_HWCR, hwcr);
   580	}
   581	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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