Hi Zong,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on v5.6-rc5]
[also build test ERROR on next-20200306]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Zong-Li/Support-strict-kernel-memory-permissions-for-security/20200309-172554
base:    2c523b344dfa65a3738e7039832044aa133c75fb
config: riscv-nommu_virt_defconfig (attached as .config)
compiler: riscv64-linux-gcc (GCC) 7.5.0
reproduce:
        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
        GCC_VERSION=7.5.0 make.cross ARCH=riscv 

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

All errors (new ones prefixed by >>):

   In file included from arch/riscv//kernel/patch.c:6:0:
   arch/riscv//kernel/patch.c: In function 'riscv_insn_write':
>> arch/riscv//kernel/patch.c:63:25: error: 'patch_lock' undeclared (first use in this function); did you mean 'patch_map'?
     raw_spin_lock_irqsave(&patch_lock, flags);
                            ^
   include/linux/spinlock.h:250:34: note: in definition of macro 'raw_spin_lock_irqsave'
      flags = _raw_spin_lock_irqsave(lock); \
                                     ^~~~
   arch/riscv//kernel/patch.c:63:25: note: each undeclared identifier is reported only once for each function it appears in
     raw_spin_lock_irqsave(&patch_lock, flags);
                            ^
   include/linux/spinlock.h:250:34: note: in definition of macro 'raw_spin_lock_irqsave'
      flags = _raw_spin_lock_irqsave(lock); \
                                     ^~~~
>> arch/riscv//kernel/patch.c:66:25: error: 'FIX_TEXT_POKE1' undeclared (first use in this function)
      patch_map(addr + len, FIX_TEXT_POKE1);
                            ^~~~~~~~~~~~~~
>> arch/riscv//kernel/patch.c:68:26: error: 'FIX_TEXT_POKE0' undeclared (first use in this function); did you mean 'FIX_TEXT_POKE1'?
     waddr = patch_map(addr, FIX_TEXT_POKE0);
                             ^~~~~~~~~~~~~~
                             FIX_TEXT_POKE1

vim +63 arch/riscv//kernel/patch.c

    55	
    56	static int __kprobes riscv_insn_write(void *addr, const void *insn, size_t len)
    57	{
    58		void *waddr = addr;
    59		bool across_pages = (((uintptr_t) addr & ~PAGE_MASK) + len) > PAGE_SIZE;
    60		unsigned long flags = 0;
    61		int ret;
    62	
  > 63		raw_spin_lock_irqsave(&patch_lock, flags);
    64	
    65		if (across_pages)
  > 66			patch_map(addr + len, FIX_TEXT_POKE1);
    67	
  > 68		waddr = patch_map(addr, FIX_TEXT_POKE0);
    69	
    70		ret = probe_kernel_write(waddr, insn, len);
    71	
    72		patch_unmap(FIX_TEXT_POKE0);
    73	
    74		if (across_pages)
    75			patch_unmap(FIX_TEXT_POKE1);
    76	
    77		raw_spin_unlock_irqrestore(&patch_lock, flags);
    78	
    79		return ret;
    80	}
    81	

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