Hi Masahiro,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
master
head:   7af08140979a6e7e12b78c93b8625c8d25b084e2
commit: 4c8dd95a723d9cccf8810be54aa62be82885c9d8 kbuild: add some extra warning 
flags unconditionally
date:   1 year, 11 months ago
config: sh-hp6xx_defconfig (attached as .config)
compiler: sh4-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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4c8dd95a723d9cccf8810be54aa62be82885c9d8
        git remote add linus 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 4c8dd95a723d9cccf8810be54aa62be82885c9d8
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 
ARCH=sh 

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

All errors (new ones prefixed by >>):

>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
   cc1: all warnings being treated as errors
--
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
   arch/sh/kernel/idle.c:32:6: error: no previous prototype for 
'arch_cpu_idle_dead' [-Werror=missing-prototypes]
      32 | void arch_cpu_idle_dead(void)
         |      ^~~~~~~~~~~~~~~~~~
   arch/sh/kernel/idle.c:37:6: error: no previous prototype for 'arch_cpu_idle' 
[-Werror=missing-prototypes]
      37 | void arch_cpu_idle(void)
         |      ^~~~~~~~~~~~~
   arch/sh/kernel/idle.c:42:13: error: no previous prototype for 
'select_idle_routine' [-Werror=missing-prototypes]
      42 | void __init select_idle_routine(void)
         |             ^~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors
--
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
   arch/sh/kernel/machvec.c: In function 'early_parse_mv':
   arch/sh/kernel/machvec.c:43:8: error: variable 'mv_comma' set but not used 
[-Werror=unused-but-set-variable]
      43 |  char *mv_comma;
         |        ^~~~~~~~
   cc1: all warnings being treated as errors
--
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
   arch/sh/kernel/ptrace_32.c: In function 'arch_ptrace':
   arch/sh/kernel/ptrace_32.c:380:26: error: comparison of unsigned expression 
< 0 is always false [-Werror=type-limits]
     380 |   if ((addr & 3) || addr < 0 ||
         |                          ^
   arch/sh/kernel/ptrace_32.c:420:26: error: comparison of unsigned expression 
< 0 is always false [-Werror=type-limits]
     420 |   if ((addr & 3) || addr < 0 ||
         |                          ^
   cc1: all warnings being treated as errors
--
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
   arch/sh/kernel/return_address.c:49:7: error: no previous prototype for 
'return_address' [-Werror=missing-prototypes]
      49 | void *return_address(unsigned int depth)
         |       ^~~~~~~~~~~~~~
   cc1: all warnings being treated as errors
--
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
   arch/sh/kernel/sys_sh.c:58:16: error: no previous prototype for 
'sys_cacheflush' [-Werror=missing-prototypes]
      58 | asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len, 
int op)
         |                ^~~~~~~~~~~~~~
   cc1: all warnings being treated as errors
--
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
   arch/sh/kernel/traps_32.c:731:6: error: no previous prototype for 
'per_cpu_trap_init' [-Werror=missing-prototypes]
     731 | void per_cpu_trap_init(void)
         |      ^~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors
--
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
   arch/sh/kernel/hw_breakpoint.c:135:5: error: no previous prototype for 
'arch_bp_generic_fields' [-Werror=missing-prototypes]
     135 | int arch_bp_generic_fields(int sh_len, int sh_type,
         |     ^~~~~~~~~~~~~~~~~~~~~~
   arch/sh/kernel/hw_breakpoint.c: In function 'arch_bp_generic_fields':
   arch/sh/kernel/hw_breakpoint.c:159:13: error: this statement may fall 
through [-Werror=implicit-fallthrough=]
     159 |   *gen_type = HW_BREAKPOINT_R;
         |   ~~~~~~~~~~^~~~~~~~~~~~~~~~~
   arch/sh/kernel/hw_breakpoint.c:160:2: note: here
     160 |  case SH_BREAKPOINT_WRITE:
         |  ^~~~
   cc1: all warnings being treated as errors
--
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
   arch/sh/mm/cache-sh3.c:93:13: error: no previous prototype for 
'sh3_cache_init' [-Werror=missing-prototypes]
      93 | void __init sh3_cache_init(void)
         |             ^~~~~~~~~~~~~~
   cc1: all warnings being treated as errors
--
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
   arch/sh/mm/fault.c:391:27: error: no previous prototype for 'do_page_fault' 
[-Werror=missing-prototypes]
     391 | asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
         |                           ^~~~~~~~~~~~~
   cc1: all warnings being treated as errors
--
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
>> cc1: error: arch/sh/include/mach-hp6xx: No such file or directory 
>> [-Werror=missing-include-dirs]
   arch/sh/mm/pgtable.c:12:6: error: no previous prototype for 'pgd_ctor' 
[-Werror=missing-prototypes]
      12 | void pgd_ctor(void *x)
         |      ^~~~~~~~
   arch/sh/mm/pgtable.c:33:8: error: no previous prototype for 'pgd_alloc' 
[-Werror=missing-prototypes]
      33 | pgd_t *pgd_alloc(struct mm_struct *mm)
         |        ^~~~~~~~~
   arch/sh/mm/pgtable.c:38:6: error: no previous prototype for 'pgd_free' 
[-Werror=missing-prototypes]
      38 | void pgd_free(struct mm_struct *mm, pgd_t *pgd)
         |      ^~~~~~~~
   cc1: all warnings being treated as errors
..

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

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