[PATCH 2/3] powerpc/mce: Add debugfs interface to inject MCE

[kernel test robot]

Hi Ganesh,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on powerpc/next]
[also build test WARNING on v5.9-rc5 next-20200916]
[cannot apply to scottwood/next mpe/next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Ganesh-Goudar/powerpc-mce-Fix-mce-handler-and-add-selftest/20200917-092355
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: powerpc-allyesconfig (attached as .config)
compiler: powerpc64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

   arch/powerpc/sysdev/mce_error_inject.c: In function 'insert_slb_entry':
>> arch/powerpc/sysdev/mce_error_inject.c:52:22: warning: variable 'paca' set but not used [-Wunused-but-set-variable]
      52 |  struct paca_struct *paca;
         |                      ^~~~

# https://github.com/0day-ci/linux/commit/4ab1196e8e542fdf0e7cda8638dfb0e5771fd98e
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Ganesh-Goudar/powerpc-mce-Fix-mce-handler-and-add-selftest/20200917-092355
git checkout 4ab1196e8e542fdf0e7cda8638dfb0e5771fd98e
vim +/paca +52 arch/powerpc/sysdev/mce_error_inject.c

    48	
    49	static void insert_slb_entry(char *p, int ssize)
    50	{
    51		unsigned long flags, entry;
  > 52		struct paca_struct *paca;
    53	
    54		flags = SLB_VSID_KERNEL | mmu_psize_defs[MMU_PAGE_64K].sllp;
    55	
    56		preempt_disable();
    57	
    58		paca = get_paca();
    59	
    60		entry = get_slb_index();
    61		asm volatile("slbmte %0,%1" :
    62				: "r" (mk_vsid_data((unsigned long)p, ssize, flags)),
    63				  "r" (mk_esid_data((unsigned long)p, ssize, entry))
    64				: "memory");
    65	
    66		entry = get_slb_index();
    67		asm volatile("slbmte %0,%1" :
    68				: "r" (mk_vsid_data((unsigned long)p, ssize, flags)),
    69				  "r" (mk_esid_data((unsigned long)p, ssize, entry))
    70				: "memory");
    71		preempt_enable();
    72		p[0] = '!';
    73	}
    74	

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