[PATCH] powerpc/papr_scm: Make 'perf_stats' invisible if perf-stats unavailable

kernel test robot lkp at intel.com
Thu May 6 08:53:31 AEST 2021

Hi Vaibhav,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on powerpc/next]
[also build test WARNING on v5.12 next-20210505]
[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

url:    https://github.com/0day-ci/linux/commits/Vaibhav-Jain/powerpc-papr_scm-Make-perf_stats-invisible-if-perf-stats-unavailable/20210506-031853
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
        # https://github.com/0day-ci/linux/commit/8e7ce04ec36dea95fad178585b697a9c5b5c259d
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Vaibhav-Jain/powerpc-papr_scm-Make-perf_stats-invisible-if-perf-stats-unavailable/20210506-031853
        git checkout 8e7ce04ec36dea95fad178585b697a9c5b5c259d
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 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/platforms/pseries/papr_scm.c:903:9: warning: no previous prototype for 'papr_nd_attribute_visible' [-Wmissing-prototypes]
     903 | umode_t papr_nd_attribute_visible(struct kobject *kobj, struct attribute *attr,
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~

vim +/papr_nd_attribute_visible +903 arch/powerpc/platforms/pseries/papr_scm.c

 > 903	umode_t papr_nd_attribute_visible(struct kobject *kobj, struct attribute *attr,
   904					  int n)
   905	{
   906		struct device *dev = container_of(kobj, typeof(*dev), kobj);
   907		struct nvdimm *nvdimm = to_nvdimm(dev);
   908		struct papr_scm_priv *p = nvdimm_provider_data(nvdimm);
   910		/* For if perf-stats not available remove perf_stats sysfs */
   911		if (attr == &dev_attr_perf_stats.attr && p->stat_buffer_len == 0)
   912			return 0;
   914		return attr->mode;
   915	}

0-DAY CI Kernel Test Service, Intel Corporation
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