Hi Greentime,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on linus/master]
[also build test ERROR on v5.9-rc4 next-20200910]
[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/20200910-163426
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 7fe10096c1508c7f033d34d0741809f8eecc1ed4
config: riscv-allmodconfig (attached as .config)
compiler: riscv64-linux-gcc (GCC) 9.3.0
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
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=riscv 

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

All error/warnings (new ones prefixed by >>):

   arch/riscv/kernel/process.c:42:6: warning: no previous prototype for 'show_regs' [-Wmissing-prototypes]
      42 | void show_regs(struct pt_regs *regs)
         |      ^~~~~~~~~
   arch/riscv/kernel/process.c:118:5: warning: no previous prototype for 'arch_dup_task_struct' [-Wmissing-prototypes]
     118 | int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
         |     ^~~~~~~~~~~~~~~~~~~~
>> arch/riscv/kernel/process.c:143:6: warning: no previous prototype for 'arch_release_task_struct' [-Wmissing-prototypes]
     143 | void arch_release_task_struct(struct task_struct *tsk)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~
--
   arch/riscv/kernel/vector.S: Assembler messages:
   arch/riscv/kernel/vector.S:42: Error: unrecognized opcode `vsetvli t4,t5,e8,m8'
>> arch/riscv/kernel/vector.S:43: Error: unrecognized opcode `vse8.v v0,(a1)'
>> arch/riscv/kernel/vector.S:45: Error: unrecognized opcode `vse8.v v8,(a1)'
>> arch/riscv/kernel/vector.S:47: Error: unrecognized opcode `vse8.v v16,(a1)'
>> arch/riscv/kernel/vector.S:49: Error: unrecognized opcode `vse8.v v24,(a1)'
   arch/riscv/kernel/vector.S:65: Error: unrecognized opcode `vsetvli t4,t5,e8,m8'
>> arch/riscv/kernel/vector.S:66: Error: unrecognized opcode `vle8.v v0,(a1)'
>> arch/riscv/kernel/vector.S:68: Error: unrecognized opcode `vle8.v v8,(a1)'
>> arch/riscv/kernel/vector.S:70: Error: unrecognized opcode `vle8.v v16,(a1)'
>> arch/riscv/kernel/vector.S:72: Error: unrecognized opcode `vle8.v v24,(a1)'
>> arch/riscv/kernel/vector.S:78: Error: unrecognized opcode `vsetvl x0,t2,t1'

# https://github.com/0day-ci/linux/commit/606b544e14a96142b4f5ede48937fc5643b12725
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Greentime-Hu/riscv-Add-vector-ISA-support/20200910-163426
git checkout 606b544e14a96142b4f5ede48937fc5643b12725
vim +43 arch/riscv/kernel/vector.S

    32	
    33	ENTRY(__vstate_save)
    34		li      status, SR_VS
    35		csrs    sstatus, status
    36	
    37		csrr    x_vstart, CSR_VSTART
    38		csrr    x_vtype, CSR_VTYPE
    39		csrr    x_vl, CSR_VL
    40		csrr    x_vcsr, CSR_VCSR
    41		li      m_one, -1
    42		vsetvli incr, m_one, e8, m8
  > 43		vse8.v   v0, (datap)
    44		add     datap, datap, incr
  > 45		vse8.v   v8, (datap)
    46		add     datap, datap, incr
  > 47		vse8.v   v16, (datap)
    48		add     datap, datap, incr
  > 49		vse8.v   v24, (datap)
    50	
    51		REG_S   x_vstart, RISCV_V_STATE_VSTART(vstatep)
    52		REG_S   x_vtype, RISCV_V_STATE_VTYPE(vstatep)
    53		REG_S   x_vl, RISCV_V_STATE_VL(vstatep)
    54		REG_S   x_vcsr, RISCV_V_STATE_VCSR(vstatep)
    55	
    56		csrc	sstatus, status
    57		ret
    58	ENDPROC(__vstate_save)
    59	
    60	ENTRY(__vstate_restore)
    61		li      status, SR_VS
    62		csrs    sstatus, status
    63	
    64		li      m_one, -1
    65		vsetvli incr, m_one, e8, m8
  > 66		vle8.v   v0, (datap)
    67		add     datap, datap, incr
  > 68		vle8.v   v8, (datap)
    69		add     datap, datap, incr
  > 70		vle8.v   v16, (datap)
    71		add     datap, datap, incr
  > 72		vle8.v   v24, (datap)
    73	
    74		REG_L   x_vstart, RISCV_V_STATE_VSTART(vstatep)
    75		REG_L   x_vtype, RISCV_V_STATE_VTYPE(vstatep)
    76		REG_L   x_vl, RISCV_V_STATE_VL(vstatep)
    77		REG_L   x_vcsr, RISCV_V_STATE_VCSR(vstatep)
  > 78		vsetvl  x0, x_vl, x_vtype

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