Hi Anson,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on powerpc/next]
[also build test ERROR on linus/master v5.14-rc2 next-20210723]
[cannot apply to paulus-powerpc/kvm-ppc-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Anson-Jacob/PPC-Add-generic-FPU-api-similar-to-x86/20210721-125053
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: powerpc-allnoconfig (attached as .config)
compiler: powerpc-linux-gcc (GCC) 10.3.0
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
        # https://github.com/0day-ci/linux/commit/d179ebec25f39a1595f42c8f9d7e4ec600ac7e04
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Anson-Jacob/PPC-Add-generic-FPU-api-similar-to-x86/20210721-125053
        git checkout d179ebec25f39a1595f42c8f9d7e4ec600ac7e04
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=powerpc 

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

All errors (new ones prefixed by >>):

>> arch/powerpc/kernel/process.c:468:6: error: no previous prototype for 'kernel_fpu_enabled' [-Werror=missing-prototypes]
     468 | bool kernel_fpu_enabled(void)
         |      ^~~~~~~~~~~~~~~~~~
>> arch/powerpc/kernel/process.c:474:6: error: no previous prototype for 'kernel_fpu_begin' [-Werror=missing-prototypes]
     474 | void kernel_fpu_begin(void)
         |      ^~~~~~~~~~~~~~~~
>> arch/powerpc/kernel/process.c:506:6: error: no previous prototype for 'kernel_fpu_end' [-Werror=missing-prototypes]
     506 | void kernel_fpu_end(void)
         |      ^~~~~~~~~~~~~~
   cc1: all warnings being treated as errors


vim +/kernel_fpu_enabled +468 arch/powerpc/kernel/process.c

   467	
 > 468	bool kernel_fpu_enabled(void)
   469	{
   470		return this_cpu_read(in_kernel_fpu);
   471	}
   472	EXPORT_SYMBOL_GPL(kernel_fpu_enabled);
   473	
 > 474	void kernel_fpu_begin(void)
   475	{
   476		if (!fpu_support()) {
   477			WARN_ON_ONCE(1);
   478			return;
   479		}
   480	
   481		preempt_disable();
   482	
   483	#ifdef CONFIG_VSX
   484		if (cpu_has_feature(CPU_FTR_VSX_COMP)) {
   485			enable_kernel_vsx();
   486			return;
   487		}
   488	#endif
   489	
   490	#ifdef CONFIG_ALTIVEC
   491		if (cpu_has_feature(CPU_FTR_ALTIVEC_COMP)) {
   492			enable_kernel_altivec();
   493			return;
   494		}
   495	#endif
   496	
   497	#ifdef CONFIG_PPC_FPU
   498		if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE)) {
   499			enable_kernel_fp();
   500			return;
   501		}
   502	#endif
   503	}
   504	EXPORT_SYMBOL_GPL(kernel_fpu_begin);
   505	
 > 506	void kernel_fpu_end(void)
   507	{
   508		if (!fpu_support()) {
   509			WARN_ON_ONCE(1);
   510			return;
   511		}
   512	

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