On 18/11/16 13:02, kbuild test robot wrote: > Hi Balbir, > > [auto build test ERROR on powerpc/next] > [also build test ERROR on v4.9-rc5 next-20161117] > [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/Balbir-Singh/powerpc-xmon-Add-support-for-dump-in-reverse/20161118-081358 > base: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next > config: powerpc-ppc64e_defconfig (attached as .config) > compiler: powerpc64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705 > reproduce: > wget > https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross > -O ~/bin/make.cross > chmod +x ~/bin/make.cross > # save the attached .config to linux build tree > make.cross ARCH=powerpc > > Note: it may well be a FALSE warning. FWIW you are at least aware of it now. > http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings > > All errors (new ones prefixed by >>): > > arch/powerpc/xmon/xmon.c: In function 'prdump': >>> arch/powerpc/xmon/xmon.c:2431:10: error: 'idx' may be used uninitialized in >>> this function [-Werror=maybe-uninitialized] > idx -= 2; > ~~~~^~~~ > cc1: all warnings being treated as errors > > vim +/idx +2431 arch/powerpc/xmon/xmon.c > > 2425 } > 2426 > 2427 if (m < nr) { > 2428 if (reverse) { > 2429 buf[idx + 1] = > digithex(temp[m] % 16); > 2430 buf[idx] = > digithex(temp[m] / 16); >> 2431 idx -= 2; > 2432 } else > 2433 printf("%.2x", temp[m]); > 2434 } else >
This seems like a false positive, I don't see it with gcc 5.3.1 on my system. I also tried with gcc 6.2.0 I tried with the same config as attached with the email in the reported failure. I'll try to get the debian 6.1.1 compiler and see how that goes. Balbir Singh.
