Re: [RFC PATCH 7/8] x86/fpu/xstate: Tweak guest fpstate to support kernel dynamic xfeatures

[kernel test robot <lkp@intel.com>]

Hi Yang,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.6-rc1 next-20230914]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Yang-Weijiang/x86-fpu-xstate-Manually-check-and-add-XFEATURE_CET_USER-xstate-bit/20230914-142957
base:   linus/master
patch link:    https://lore.kernel.org/r/20230914032334.75212-8-weijiang.yang%40intel.com
patch subject: [RFC PATCH 7/8] x86/fpu/xstate: Tweak guest fpstate to support kernel dynamic xfeatures
config: x86_64-buildonly-randconfig-002-20230914 (https://download.01.org/0day-ci/archive/20230914/202309141610.x0Q8QRPE-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230914/202309141610.x0Q8QRPE-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309141610.x0Q8QRPE-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/x86/kernel/fpu/xstate.c:564:14: warning: no previous prototype for 'xstate_calculate_size' [-Wmissing-prototypes]
     564 | unsigned int xstate_calculate_size(u64 xfeatures, bool compacted)
         |              ^~~~~~~~~~~~~~~~~~~~~


vim +/xstate_calculate_size +564 arch/x86/kernel/fpu/xstate.c

   563	
 > 564	unsigned int xstate_calculate_size(u64 xfeatures, bool compacted)
   565	{
   566		unsigned int topmost = fls64(xfeatures) -  1;
   567		unsigned int offset = xstate_offsets[topmost];
   568	
   569		if (topmost <= XFEATURE_SSE)
   570			return sizeof(struct xregs_state);
   571	
   572		if (compacted)
   573			offset = xfeature_get_offset(xfeatures, topmost);
   574		return offset + xstate_sizes[topmost];
   575	}
   576	

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