Hi Peng, Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on char-misc/char-misc-testing] [cannot apply to v4.20-rc7] [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/Peng-Hao/misc-pvpanic-return-0-for-empty-body-register-function/20181217-151203 config: ia64-allmodconfig (attached as .config) compiler: ia64-linux-gcc (GCC) 8.1.0 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=8.1.0 make.cross ARCH=ia64 All warnings (new ones prefixed by >>): drivers//misc/pvpanic.c: In function 'pvpanic_mmio_init': >> drivers//misc/pvpanic.c:254:6: warning: 'r1' is used uninitialized in this >> function [-Wuninitialized] if (r1 && r2) /* all drivers register failed */ ^~ vim +/r1 +254 drivers//misc/pvpanic.c 244 245 static int __init pvpanic_mmio_init(void) 246 { 247 int r1, r2; 248 249 if (acpi_disabled) 250 r1 = platform_driver_register(&pvpanic_mmio_driver); 251 else 252 r2 = pvpanic_register_acpi_driver(); 253 r2 = pvpanic_register_pci_drvier(); > 254 if (r1 && r2) /* all drivers register failed */ 255 return 1; 256 else 257 return 0; 258 } 259 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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