Hi Chun-Yi",

I love your patch! Perhaps something to improve:

[auto build test WARNING on cryptodev/master]
[also build test WARNING on linus/master v5.13-rc2 next-20210521]
[cannot apply to crypto/master]
[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/Lee-Chun-Yi/Check-codeSigning-extended-key-usage-extension/20210522-220349
base:   https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git master
config: openrisc-randconfig-r015-20210522 (attached as .config)
compiler: or1k-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
        # https://github.com/0day-ci/linux/commit/928555596c9cd62caabf8777ed8152ddac2609ef
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Lee-Chun-Yi/Check-codeSigning-extended-key-usage-extension/20210522-220349
        git checkout 928555596c9cd62caabf8777ed8152ddac2609ef
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=openrisc 

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 >>):

   In file included from certs/system_keyring.c:17:
   include/keys/system_keyring.h:72:1: error: expected identifier or '(' before '{' token
      72 | {
         | ^
>> include/keys/system_keyring.h:70:19: warning: 'is_key_on_revocation_list' used but never defined
      70 | static inline int is_key_on_revocation_list(struct pkcs7_message *pkcs7,
         |                   ^~~~~~~~~~~~~~~~~~~~~~~~~


vim +/is_key_on_revocation_list +70 include/keys/system_keyring.h

    60	
    61	#ifdef CONFIG_SYSTEM_REVOCATION_LIST
    62	extern int add_key_to_revocation_list(const char *data, size_t size);
    63	extern int is_key_on_revocation_list(struct pkcs7_message *pkcs7,
    64					     enum key_being_used_for usage);
    65	#else
    66	static inline int add_key_to_revocation_list(const char *data, size_t size)
    67	{
    68		return 0;
    69	}
  > 70	static inline int is_key_on_revocation_list(struct pkcs7_message *pkcs7,
    71						    enum key_being_used_for usage);
    72	{
    73		return -ENOKEY;
    74	}
    75	#endif
    76	

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