[vhost:linux-next 4/5] kernel/rcu/tiny.c:138:22: error: 'rcu_data' undeclared

[kbuild test robot <lkp@intel.com>]

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tree:   https://kernel.googlesource.com/pub/scm/linux/kernel/git/mst/vhost.git linux-next
head:   25da3c2b439666602852820e3231349085682e1a
commit: 4cfd64ce2ad979cbd9a97e1500533d2f5f1355b8 [4/5] rcu: add count of outstanding callbacks
config: i386-allnoconfig (attached as .config)
compiler: gcc-7 (Debian 7.4.0-10) 7.4.0
reproduce:
        git checkout 4cfd64ce2ad979cbd9a97e1500533d2f5f1355b8
        # save the attached .config to linux build tree
        make ARCH=i386 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

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

   In file included from include/asm-generic/percpu.h:7:0,
                    from arch/x86/include/asm/percpu.h:556,
                    from arch/x86/include/asm/preempt.h:6,
                    from include/linux/preempt.h:78,
                    from include/linux/spinlock.h:51,
                    from include/linux/wait.h:9,
                    from include/linux/completion.h:12,
                    from kernel/rcu/tiny.c:12:
   kernel/rcu/tiny.c: In function 'call_rcu_outstanding':
>> kernel/rcu/tiny.c:138:22: error: 'rcu_data' undeclared (first use in this function)
     rdp = this_cpu_ptr(&rcu_data);
                         ^
   include/linux/percpu-defs.h:220:47: note: in definition of macro '__verify_pcpu_ptr'
     const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL; \
                                                  ^~~
>> include/linux/percpu-defs.h:264:47: note: in expansion of macro 'VERIFY_PERCPU_PTR'
    #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR(ptr); })
                                                  ^~~~~~~~~~~~~~~~~
>> include/linux/percpu-defs.h:265:26: note: in expansion of macro 'per_cpu_ptr'
    #define raw_cpu_ptr(ptr) per_cpu_ptr(ptr, 0)
                             ^~~~~~~~~~~
>> include/linux/percpu-defs.h:266:27: note: in expansion of macro 'raw_cpu_ptr'
    #define this_cpu_ptr(ptr) raw_cpu_ptr(ptr)
                              ^~~~~~~~~~~
>> kernel/rcu/tiny.c:138:8: note: in expansion of macro 'this_cpu_ptr'
     rdp = this_cpu_ptr(&rcu_data);
           ^~~~~~~~~~~~
   kernel/rcu/tiny.c:138:22: note: each undeclared identifier is reported only once for each function it appears in
     rdp = this_cpu_ptr(&rcu_data);
                         ^
   include/linux/percpu-defs.h:220:47: note: in definition of macro '__verify_pcpu_ptr'
     const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL; \
                                                  ^~~
>> include/linux/percpu-defs.h:264:47: note: in expansion of macro 'VERIFY_PERCPU_PTR'
    #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR(ptr); })
                                                  ^~~~~~~~~~~~~~~~~
>> include/linux/percpu-defs.h:265:26: note: in expansion of macro 'per_cpu_ptr'
    #define raw_cpu_ptr(ptr) per_cpu_ptr(ptr, 0)
                             ^~~~~~~~~~~
>> include/linux/percpu-defs.h:266:27: note: in expansion of macro 'raw_cpu_ptr'
    #define this_cpu_ptr(ptr) raw_cpu_ptr(ptr)
                              ^~~~~~~~~~~
>> kernel/rcu/tiny.c:138:8: note: in expansion of macro 'this_cpu_ptr'
     rdp = this_cpu_ptr(&rcu_data);
           ^~~~~~~~~~~~

vim +/rcu_data +138 kernel/rcu/tiny.c

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