[ia64:mce_copyin 8/8] arch/x86/kernel/cpu/mce/severity.c:204:14: error: 'MAX_INSN_SIZE' undeclared;

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux.git mce_copyin
head:   722f462f54ac667ca8fbf3104ae5093d5b12aaf5
commit: 722f462f54ac667ca8fbf3104ae5093d5b12aaf5 [8/8] x86/mce: Decode a kernel instruction to determine if it is copying from user
config: i386-randconfig-a005-20200908 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        git checkout 722f462f54ac667ca8fbf3104ae5093d5b12aaf5
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

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/x86/kernel/cpu/mce/severity.c: In function 'is_copy_from_user':
>> arch/x86/kernel/cpu/mce/severity.c:204:14: error: 'MAX_INSN_SIZE' undeclared (first use in this function); did you mean 'MAX_UINSN_BYTES'?
     204 |  u8 insn_buf[MAX_INSN_SIZE];
         |              ^~~~~~~~~~~~~
         |              MAX_UINSN_BYTES
   arch/x86/kernel/cpu/mce/severity.c:204:14: note: each undeclared identifier is reported only once for each function it appears in
>> arch/x86/kernel/cpu/mce/severity.c:205:14: error: storage size of 'insn' isn't known
     205 |  struct insn insn;
         |              ^~~~
>> arch/x86/kernel/cpu/mce/severity.c:209:2: error: implicit declaration of function 'kernel_insn_init'; did you mean 'kernfs_init'? [-Werror=implicit-function-declaration]
     209 |  kernel_insn_init(&insn, insn_buf, MAX_INSN_SIZE);
         |  ^~~~~~~~~~~~~~~~
         |  kernfs_init
>> arch/x86/kernel/cpu/mce/severity.c:210:2: error: implicit declaration of function 'insn_get_length' [-Werror=implicit-function-declaration]
     210 |  insn_get_length(&insn);
         |  ^~~~~~~~~~~~~~~
   arch/x86/kernel/cpu/mce/severity.c:205:14: warning: unused variable 'insn' [-Wunused-variable]
     205 |  struct insn insn;
         |              ^~~~
   arch/x86/kernel/cpu/mce/severity.c:204:5: warning: unused variable 'insn_buf' [-Wunused-variable]
     204 |  u8 insn_buf[MAX_INSN_SIZE];
         |     ^~~~~~~~
   cc1: some warnings being treated as errors

# https://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux.git/commit/?id=722f462f54ac667ca8fbf3104ae5093d5b12aaf5
git remote add ia64 https://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux.git
git fetch --no-tags ia64 mce_copyin
git checkout 722f462f54ac667ca8fbf3104ae5093d5b12aaf5
vim +204 arch/x86/kernel/cpu/mce/severity.c

   198	
   199	#define mc_recoverable(mcg) (((mcg) & (MCG_STATUS_RIPV|MCG_STATUS_EIPV)) == \
   200					(MCG_STATUS_RIPV|MCG_STATUS_EIPV))
   201	
   202	static bool is_copy_from_user(struct pt_regs *regs)
   203	{
 > 204		u8 insn_buf[MAX_INSN_SIZE];
 > 205		struct insn insn;
   206	
   207		if (copy_from_kernel_nofault(insn_buf, (void *)regs->ip, MAX_INSN_SIZE))
   208			return false;
 > 209		kernel_insn_init(&insn, insn_buf, MAX_INSN_SIZE);
 > 210		insn_get_length(&insn);
   211	
   212		switch (insn.opcode.value) {
   213		case 0x8A: case 0x8B:		/* MOV */
   214		case 0xB60F: case 0xB70F:	/* MOVZ */
   215			return true;
   216		case 0xA4: case 0xA5:		/* MOVS */
   217			return !fault_in_kernel_space(regs->si);
   218		}
   219	
   220		return false;
   221	}
   222	

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

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