Hi Greentime,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on v5.14]
[cannot apply to linus/master linux/master next-20210908]
[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/Greentime-Hu/riscv-Add-vector-ISA-support/20210909-014904
base:    7d2a07b769330c34b4deabeed939325c77a7ec2f
config: riscv-randconfig-r042-20210908 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 9c476172b93367d2cb88d7d3f4b1b5b456fa6020)
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 riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/0day-ci/linux/commit/0ff49e5b8a3d84bd26a64f68bb4161680ab463ef
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Greentime-Hu/riscv-Add-vector-ISA-support/20210909-014904
        git checkout 0ff49e5b8a3d84bd26a64f68bb4161680ab463ef
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv 

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/riscv/kernel/process.c:140:39: error: use of undeclared identifier 'riscv_vsize'
                           dst->thread.vstate.datap = kzalloc(riscv_vsize, GFP_KERNEL);
                                                              ^
   arch/riscv/kernel/process.c:146:37: error: use of undeclared identifier 'riscv_vsize'
                                  src->thread.vstate.datap, riscv_vsize);
                                                            ^
>> arch/riscv/kernel/process.c:153:6: warning: no previous prototype for function 'arch_release_task_struct' [-Wmissing-prototypes]
   void arch_release_task_struct(struct task_struct *tsk)
        ^
   arch/riscv/kernel/process.c:153:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void arch_release_task_struct(struct task_struct *tsk)
   ^
   static 
   1 warning and 2 errors generated.


vim +/arch_release_task_struct +153 arch/riscv/kernel/process.c

   152	
 > 153	void arch_release_task_struct(struct task_struct *tsk)
   154	{
   155		/* Free the vector context of datap. */
   156		if (has_vector)
   157			kfree(tsk->thread.vstate.datap);
   158	}
   159	

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