[jirislaby:devel 31/31] arch/nds32/include/asm/current.h:10:13: error: '$r25' undeclared

[jirislaby:devel 31/31] arch/nds32/include/asm/current.h:10:13: error: '$r25' undeclared

[kbuild test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git devel
head:   692d615834a5950b61707f688abddb56841ea5ba
commit: 692d615834a5950b61707f688abddb56841ea5ba [31/31] stacktrace: don't skip first entry on noncurrent tasks
config: nds32-defconfig (attached as .config)
compiler: nds32le-linux-gcc (GCC) 8.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 692d615834a5950b61707f688abddb56841ea5ba
        # save the attached .config to linux build tree
        GCC_VERSION=8.1.0 make.cross ARCH=nds32 

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

All errors (new ones prefixed by >>):

   In file included from include/linux/sched.h:12,
                    from include/linux/sched/task_stack.h:9,
                    from kernel/stacktrace.c:9:
   kernel/stacktrace.c: In function 'stack_trace_save_tsk':
>> arch/nds32/include/asm/current.h:10:13: error: '$r25' undeclared (first use in this function)
    #define tsk $r25
                ^~~~
   kernel/stacktrace.c:303:34: note: in expansion of macro 'tsk'
      .skip = skipnr + !!(current == tsk),
                                     ^~~
   arch/nds32/include/asm/current.h:10:13: note: each undeclared identifier is reported only once for each function it appears in
    #define tsk $r25
                ^~~~
   kernel/stacktrace.c:303:34: note: in expansion of macro 'tsk'
      .skip = skipnr + !!(current == tsk),
                                     ^~~

vim +10 arch/nds32/include/asm/current.h

a15e9ffa877852 Greentime Hu 2017-10-24   6  
a15e9ffa877852 Greentime Hu 2017-10-24   7  #ifndef __ASSEMBLY__
a15e9ffa877852 Greentime Hu 2017-10-24   8  register struct task_struct *current asm("$r25");
a15e9ffa877852 Greentime Hu 2017-10-24   9  #endif /* __ASSEMBLY__ */
a15e9ffa877852 Greentime Hu 2017-10-24 @10  #define tsk $r25
a15e9ffa877852 Greentime Hu 2017-10-24  11  

:::::: The code at line 10 was first introduced by commit
:::::: a15e9ffa877852e529db33cc615c132bad2fc60a nds32: Process management

:::::: TO: Greentime Hu <greentime@andestech.com>
:::::: CC: Greentime Hu <greentime@andestech.com>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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