Hi Gautham,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on powerpc/next]
[also build test ERROR on v4.18-rc8 next-20180806]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Gautham-R-Shenoy/powerpc-Detect-the-presence-of-big-cores-via-ibm-thread-groups/20180807-075133
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: powerpc-pasemi_defconfig (attached as .config)
compiler: powerpc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        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
        GCC_VERSION=7.2.0 make.cross ARCH=powerpc 

All errors (new ones prefixed by >>):

>> arch/powerpc/kernel/smp.c:1178:30: error: 'smallcore_smt_mask' defined but not used [-Werror=unused-function]
    static const struct cpumask *smallcore_smt_mask(int cpu)
                                 ^~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors

vim +/smallcore_smt_mask +1178 arch/powerpc/kernel/smp.c

  1177	
> 1178	static const struct cpumask *smallcore_smt_mask(int cpu)
  1179	{
  1180		return cpu_smallcore_sibling_mask(cpu);
  1181	}
  1182	

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