[tip:WIP.core/stacktrace 4/32] include/linux/stacktrace.h:65:10: error: 'ENOSYS' undeclared

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.core/stacktrace
head:   9fe290aca53f59fd24187841dd4a8ff41ade91bd
commit: 714f46ba649b163e80d3dd89e83b92f4ba5ac6af [4/32] stacktrace: Provide helpers for common stack trace operations
config: i386-randconfig-x010-201915 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout 714f46ba649b163e80d3dd89e83b92f4ba5ac6af
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   In file included from include/linux/lockdep.h:29:0,
                    from include/linux/spinlock_types.h:18,
                    from kernel/bounds.c:14:
   include/linux/stacktrace.h:62:19: error: static declaration of 'save_stack_trace_tsk_reliable' follows non-static declaration
    static inline int save_stack_trace_tsk_reliable(struct task_struct *tsk,
                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/stacktrace.h:39:12: note: previous declaration of 'save_stack_trace_tsk_reliable' was here
    extern int save_stack_trace_tsk_reliable(struct task_struct *tsk,
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/stacktrace.h: In function 'save_stack_trace_tsk_reliable':
>> include/linux/stacktrace.h:65:10: error: 'ENOSYS' undeclared (first use in this function)
     return -ENOSYS;
             ^~~~~~
   include/linux/stacktrace.h:65:10: note: each undeclared identifier is reported only once for each function it appears in
   make[2]: *** [kernel/bounds.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [sub-make] Error 2

vim +/ENOSYS +65 include/linux/stacktrace.h

    60	
    61	#if !defined(CONFIG_STACKTRACE) || !defined(CONFIG_HAVE_RELIABLE_STACKTRACE)
  > 62	static inline int save_stack_trace_tsk_reliable(struct task_struct *tsk,
    63							struct stack_trace *trace)
    64	{
  > 65		return -ENOSYS;
    66	}
    67	#endif
    68	

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