[vfs:work.regset 9/9] arch/s390/kernel/ptrace.c:1441:14: error: use of undeclared identifier 'n'

[kbuild test robot <lkp@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git work.regset
head:   138d089e6e8405365b245811afb7401091629edd
commit: 138d089e6e8405365b245811afb7401091629edd [9/9] s390: switch to ->get2()
config: s390-randconfig-r025-20200513 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 310d32cb80a611e6384a921e85607fea05841f26)
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install s390 cross compiling tool for clang build
        # apt-get install binutils-s390-linux-gnu
        git checkout 138d089e6e8405365b245811afb7401091629edd
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

>> arch/s390/kernel/ptrace.c:1441:14: error: use of undeclared identifier 'n'
for (i = 0; n < NUM_GPRS; i++, gprs_high += 2)
^
1 error generated.

vim +/n +1441 arch/s390/kernel/ptrace.c

  1432	
  1433	static int s390_compat_regs_high_get(struct task_struct *target,
  1434					     const struct user_regset *regset,
  1435					     struct membuf to)
  1436	{
  1437		compat_ulong_t *gprs_high;
  1438		int i;
  1439	
  1440		gprs_high = (compat_ulong_t *)task_pt_regs(target)->gprs;
> 1441		for (i = 0; n < NUM_GPRS; i++, gprs_high += 2)
  1442			membuf_store(&to, *gprs_high);
  1443		return 0;
  1444	}
  1445	

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

Attachment: .config.gz
Description: application/gzip