Re: [PATCH 4/5] powerpc/lib/sstep: Add prty instruction emulation

Hi Matt,

[auto build test ERROR on powerpc/next]
[also build test ERROR on v4.12 next-20170714]
[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/Matt-Brown/powerpc-lib-sstep-Add-cmpb-instruction-emulation/20170714-020837
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: powerpc-chrp32_defconfig (attached as .config)
compiler: powerpc-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=powerpc 

All errors (new ones prefixed by >>):

   arch/powerpc/lib/sstep.c: In function 'do_prtyw':

quoted

arch/powerpc/lib/sstep.c:673:16: error: left shift count >= width of type [-Werror=shift-count-overflow]

      out |= (high << 32);
                   ^~
   cc1: all warnings being treated as errors

vim +673 arch/powerpc/lib/sstep.c

   654	
   655	static nokprobe_inline void do_prtyw(struct pt_regs *regs, unsigned long v,
   656					int ra)
   657	{
   658		unsigned long low, high, out;
   659		unsigned int i;
   660	
   661		high = 0;
   662		low = 0;
   663		out = 0;
   664	
   665		for (i = 0; i < 8; i++) {
   666			if (v & (1 << (i * 8)))
   667				(i < 4) ? (low++) : (high++);
   668		}
   669	
   670		if (low % 2)
   671			out |= low;
   672		if (high % 2)
 > 673			out |= (high << 32);
   674	
   675		regs->gpr[ra] = out;
   676	}
   677	

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