Hi Kairui,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on linux/master]
[also build test ERROR on tip/x86/core linus/master v5.9-rc4 next-20200908]
[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/Kairui-Song/Add-writing-support-to-vmcore-for-reusing-oldmem/20200909-155222
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git bcf876870b95592b52519ed4aafcf9d95999bc9c
config: nios2-randconfig-r026-20200909 (attached as .config)
compiler: nios2-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=nios2 

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 >>):

   In file included from net/core/dev.c:140:
   include/linux/crash_dump.h: In function 'read_from_oldmem':
>> include/linux/crash_dump.h:131:40: error: parameter name omitted
     131 | static inline ssize_t read_from_oldmem(char*, size_t, u64*, int, bool)
         |                                        ^~~~~
   include/linux/crash_dump.h:131:47: error: parameter name omitted
     131 | static inline ssize_t read_from_oldmem(char*, size_t, u64*, int, bool)
         |                                               ^~~~~~
   include/linux/crash_dump.h:131:55: error: parameter name omitted
     131 | static inline ssize_t read_from_oldmem(char*, size_t, u64*, int, bool)
         |                                                       ^~~~
   include/linux/crash_dump.h:131:61: error: parameter name omitted
     131 | static inline ssize_t read_from_oldmem(char*, size_t, u64*, int, bool)
         |                                                             ^~~
   include/linux/crash_dump.h:131:66: error: parameter name omitted
     131 | static inline ssize_t read_from_oldmem(char*, size_t, u64*, int, bool)
         |                                                                  ^~~~
   include/linux/crash_dump.h: At top level:
>> include/linux/crash_dump.h:136:1: error: expected identifier or '(' before '{' token
     136 | {
         | ^
   include/linux/crash_dump.h:135:23: warning: 'write_to_oldmem' declared 'static' but never defined [-Wunused-function]
     135 | static inline ssize_t write_to_oldmem(char*, size_t, u64*, int, bool);
         |                       ^~~~~~~~~~~~~~~

# https://github.com/0day-ci/linux/commit/6d641ec8d1a1d979916bca93ddf975a9a860c8f2
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Kairui-Song/Add-writing-support-to-vmcore-for-reusing-oldmem/20200909-155222
git checkout 6d641ec8d1a1d979916bca93ddf975a9a860c8f2
vim +131 include/linux/crash_dump.h

   122	
   123	#ifdef CONFIG_PROC_VMCORE
   124	ssize_t read_from_oldmem(char *buf, size_t count,
   125				 u64 *ppos, int userbuf,
   126				 bool encrypted);
   127	ssize_t write_to_oldmem(char *buf, size_t count,
   128				u64 *ppos, int userbuf,
   129				bool encrypted);
   130	#else
 > 131	static inline ssize_t read_from_oldmem(char*, size_t, u64*, int, bool)
   132	{
   133		return -EOPNOTSUPP;
   134	}
   135	static inline ssize_t write_to_oldmem(char*, size_t, u64*, int, bool);
 > 136	{
   137		return -EOPNOTSUPP;
   138	}
   139	#endif /* CONFIG_PROC_VMCORE */
   140	

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