[kbuild-all] arch/sparc/include/asm/io_64.h:175:16: warning: 'reg' is used uninitialized in this function

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 4b6c093e21d36bede0fd88fd0aeb3b03647260e4 commit: 2a6c0b82e65128c73b5102e00e031c5e58bb3504 USB: PHY: JZ4770: Add support for new Ingenic SoCs. date: 3 weeks ago config: sparc64-randconfig-r002-20200816 (attached as .config) compiler: sparc64-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 git checkout 2a6c0b82e65128c73b5102e00e031c5e58bb3504 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sparc64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from arch/sparc/include/asm/io.h:5, from include/linux/io.h:13, from drivers/usb/phy/phy-jz4770.c:10: drivers/usb/phy/phy-jz4770.c: In function 'ingenic_usb_phy_init': 175 | #define writel writel | ^~~~~~ drivers/usb/phy/phy-jz4770.c:161:6: note: 'reg' was declared here 161 | u32 reg; | ^~~ # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 2a6c0b82e65128c73b5102e00e031c5e58bb3504 vim +/reg +175 arch/sparc/include/asm/io_64.h f5e706ad886b6a5 include/asm-sparc/io_64.h Sam Ravnborg 2008-07-17 174 79294d7eff89f65 arch/sparc/include/asm/io_64.h Sam Ravnborg 2014-07-20 @175 #define writel writel 7c3969c3a4f3593 arch/sparc/include/asm/io_64.h Arnd Bergmann 2014-11-19 176 #define writel_relaxed writel 79294d7eff89f65 arch/sparc/include/asm/io_64.h Sam Ravnborg 2014-07-20 177 static inline void writel(u32 l, volatile void __iomem *addr) f5e706ad886b6a5 include/asm-sparc/io_64.h Sam Ravnborg 2008-07-17 178 { f5e706ad886b6a5 include/asm-sparc/io_64.h Sam Ravnborg 2008-07-17 179 __asm__ __volatile__("stwa\t%r0, [%1] %2\t/* pci_writel */" f5e706ad886b6a5 include/asm-sparc/io_64.h Sam Ravnborg 2008-07-17 180 : /* no outputs */ f5e706ad886b6a5 include/asm-sparc/io_64.h Sam Ravnborg 2008-07-17 181 : "Jr" (l), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L) f5e706ad886b6a5 include/asm-sparc/io_64.h Sam Ravnborg 2008-07-17 182 : "memory"); f5e706ad886b6a5 include/asm-sparc/io_64.h Sam Ravnborg 2008-07-17 183 } f5e706ad886b6a5 include/asm-sparc/io_64.h Sam Ravnborg 2008-07-17 184 :::::: The code at line 175 was first introduced by commit :::::: 79294d7eff89f65d2e58021bca81437e88fa61e3 sparc64: remove macro indirection in io_64.h :::::: TO: Sam Ravnborg <sam(a)ravnborg.org&gt; :::::: CC: David S. Miller <davem(a)davemloft.net&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org