Hi Andrew,

[auto build test results on v4.3-rc3 -- if it's inappropriate base, please ignore]

config: arm64-allnoconfig (attached as .config)
reproduce:
  wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
  chmod +x ~/bin/make.cross
  git checkout fe86f28ac31c45961e8b7bedb02c1836ddc91860
  # save the attached .config to linux build tree
  make.cross ARCH=arm64 

All error/warnings (new ones prefixed by >>):

   In file included from arch/arm64/kernel/process.c:48:0:
>> arch/arm64/include/asm/compat.h:336:38: error: macro "is_compat_task" passed 1 arguments, but takes just 0
    static inline int is_compat_task(void)
                                         ^
>> arch/arm64/include/asm/compat.h:337:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
    {
    ^
>> arch/arm64/include/asm/compat.h:341:19: error: redefinition of 'is_compat_thread'
    static inline int is_compat_thread(struct thread_info *thread)
                      ^
   arch/arm64/include/asm/compat.h:324:19: note: previous definition of 'is_compat_thread' was here
    static inline int is_compat_thread(struct thread_info *thread)
                      ^
   arch/arm64/include/asm/compat.h: In function 'is_compat_thread':
>> arch/arm64/include/asm/compat.h:343:2: error: implicit declaration of function 'is_a32_compat_thread' [-Werror=implicit-function-declaration]
     return is_a32_compat_thread(thread);
     ^
   cc1: some warnings being treated as errors
--
   In file included from arch/arm64/kernel/ptrace.c:41:0:
>> arch/arm64/include/asm/compat.h:336:38: error: macro "is_compat_task" passed 1 arguments, but takes just 0
    static inline int is_compat_task(void)
                                         ^
>> arch/arm64/include/asm/compat.h:337:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
    {
    ^
>> arch/arm64/include/asm/compat.h:341:19: error: redefinition of 'is_compat_thread'
    static inline int is_compat_thread(struct thread_info *thread)
                      ^
   arch/arm64/include/asm/compat.h:324:19: note: previous definition of 'is_compat_thread' was here
    static inline int is_compat_thread(struct thread_info *thread)
                      ^
   arch/arm64/include/asm/compat.h: In function 'is_compat_thread':
>> arch/arm64/include/asm/compat.h:343:2: error: implicit declaration of function 'is_a32_compat_thread' [-Werror=implicit-function-declaration]
     return is_a32_compat_thread(thread);
     ^
   arch/arm64/kernel/ptrace.c: At top level:
   arch/arm64/kernel/ptrace.c:1190:56: error: unknown type name 'compat_long_t'
    long compat_a32_arch_ptrace(struct task_struct *child, compat_long_t request,
                                                           ^
   arch/arm64/kernel/ptrace.c:1191:8: error: unknown type name 'compat_ulong_t'
           compat_ulong_t caddr, compat_ulong_t cdata)
           ^
   arch/arm64/kernel/ptrace.c:1191:30: error: unknown type name 'compat_ulong_t'
           compat_ulong_t caddr, compat_ulong_t cdata)
                                 ^
   cc1: some warnings being treated as errors
--
   arch/arm64/kernel/signal.c: In function 'setup_restart_syscall':
>> arch/arm64/kernel/signal.c:279:2: error: implicit declaration of function 'is_a32_compat_task' [-Werror=implicit-function-declaration]
     if (is_a32_compat_task())
     ^
   arch/arm64/kernel/signal.c:280:3: error: implicit declaration of function 'compat_setup_restart_syscall' [-Werror=implicit-function-declaration]
      compat_setup_restart_syscall(regs);
      ^
   arch/arm64/kernel/signal.c: In function 'handle_signal':
   arch/arm64/kernel/signal.c:300:4: error: implicit declaration of function 'compat_setup_rt_frame' [-Werror=implicit-function-declaration]
       ret = compat_setup_rt_frame(usig, ksig, oldset, regs);
       ^
   arch/arm64/kernel/signal.c:302:4: error: implicit declaration of function 'compat_setup_frame' [-Werror=implicit-function-declaration]
       ret = compat_setup_frame(usig, ksig, oldset, regs);
       ^
   cc1: some warnings being treated as errors

vim +/is_compat_task +336 arch/arm64/include/asm/compat.h

   330	{
   331		return 0;
   332	}
   333	
   334	#endif /* CONFIG_COMPAT */
   335	
 > 336	static inline int is_compat_task(void)
 > 337	{
   338		return is_a32_compat_task();
   339	}
   340	
 > 341	static inline int is_compat_thread(struct thread_info *thread)
   342	{
 > 343		return is_a32_compat_thread(thread);
   344	}
   345	#endif /* __KERNEL__ */
   346	#endif /* __ASM_COMPAT_H */

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