tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 761c6d7ec820f123b931e7b8ef7ec7c8564e450f commit: 5f291bfd33c8995c69f5a50f21445a4a93584ed2 arm: Typo s/PCI_IXP4XX_LEGACY/IXP4XX_PCI_LEGACY/ date: 4 weeks ago config: arm-randconfig-r032-20210811 (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 10.3.0 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 # 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 5f291bfd33c8995c69f5a50f21445a4a93584ed2 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=arm SHELL=/bin/bash drivers/pci/controller/ 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 >>): 38 | #define IXP4XX_PCI_CSR 0x1c | In file included from arch/arm/mach-ixp4xx/include/mach/hardware.h:23, from arch/arm/mach-ixp4xx/include/mach/io.h:15, from arch/arm/include/asm/io.h:198, from include/linux/io.h:13, from drivers/pci/controller/pci-ixp4xx.c:20: arch/arm/mach-ixp4xx/include/mach/ixp4xx-regs.h:221: note: this is the location of the previous definition 221 | #define IXP4XX_PCI_CSR(x) ((volatile u32 *)(IXP4XX_PCI_CFG_BASE_VIRT+(x))) | drivers/pci/controller/pci-ixp4xx.c:148:12: error: 'ixp4xx_pci_read' redeclared as different kind of symbol 148 | static int ixp4xx_pci_read(struct ixp4xx_pci *p, u32 addr, u32 cmd, u32 *data) | ^~~~~~~~~~~~~~~ In file included from arch/arm/include/asm/io.h:198, from include/linux/io.h:13, from drivers/pci/controller/pci-ixp4xx.c:20: arch/arm/mach-ixp4xx/include/mach/io.h:17:14: note: previous declaration of 'ixp4xx_pci_read' was here 17 | extern int (*ixp4xx_pci_read)(u32 addr, u32 cmd, u32* data); | ^~~~~~~~~~~~~~~ drivers/pci/controller/pci-ixp4xx.c:173:12: error: conflicting types for 'ixp4xx_pci_write' 173 | static int ixp4xx_pci_write(struct ixp4xx_pci *p, u32 addr, u32 cmd, u32 data) | ^~~~~~~~~~~~~~~~ In file included from arch/arm/include/asm/io.h:198, from include/linux/io.h:13, from drivers/pci/controller/pci-ixp4xx.c:20: arch/arm/mach-ixp4xx/include/mach/io.h:18:12: note: previous declaration of 'ixp4xx_pci_write' was here 18 | extern int ixp4xx_pci_write(u32 addr, u32 cmd, u32 data); | ^~~~~~~~~~~~~~~~ vim +/IXP4XX_PCI_CSR +38 drivers/pci/controller/pci-ixp4xx.c f7821b49345848 Linus Walleij 2021-05-03 29 f7821b49345848 Linus Walleij 2021-05-03 30 /* Register offsets */ f7821b49345848 Linus Walleij 2021-05-03 31 #define IXP4XX_PCI_NP_AD 0x00 f7821b49345848 Linus Walleij 2021-05-03 32 #define IXP4XX_PCI_NP_CBE 0x04 f7821b49345848 Linus Walleij 2021-05-03 33 #define IXP4XX_PCI_NP_WDATA 0x08 f7821b49345848 Linus Walleij 2021-05-03 34 #define IXP4XX_PCI_NP_RDATA 0x0c f7821b49345848 Linus Walleij 2021-05-03 35 #define IXP4XX_PCI_CRP_AD_CBE 0x10 f7821b49345848 Linus Walleij 2021-05-03 36 #define IXP4XX_PCI_CRP_WDATA 0x14 f7821b49345848 Linus Walleij 2021-05-03 37 #define IXP4XX_PCI_CRP_RDATA 0x18 f7821b49345848 Linus Walleij 2021-05-03 @38 #define IXP4XX_PCI_CSR 0x1c f7821b49345848 Linus Walleij 2021-05-03 39 #define IXP4XX_PCI_ISR 0x20 f7821b49345848 Linus Walleij 2021-05-03 40 #define IXP4XX_PCI_INTEN 0x24 f7821b49345848 Linus Walleij 2021-05-03 41 #define IXP4XX_PCI_DMACTRL 0x28 f7821b49345848 Linus Walleij 2021-05-03 42 #define IXP4XX_PCI_AHBMEMBASE 0x2c f7821b49345848 Linus Walleij 2021-05-03 43 #define IXP4XX_PCI_AHBIOBASE 0x30 f7821b49345848 Linus Walleij 2021-05-03 44 #define IXP4XX_PCI_PCIMEMBASE 0x34 f7821b49345848 Linus Walleij 2021-05-03 45 #define IXP4XX_PCI_AHBDOORBELL 0x38 f7821b49345848 Linus Walleij 2021-05-03 46 #define IXP4XX_PCI_PCIDOORBELL 0x3c f7821b49345848 Linus Walleij 2021-05-03 47 #define IXP4XX_PCI_ATPDMA0_AHBADDR 0x40 f7821b49345848 Linus Walleij 2021-05-03 48 #define IXP4XX_PCI_ATPDMA0_PCIADDR 0x44 f7821b49345848 Linus Walleij 2021-05-03 49 #define IXP4XX_PCI_ATPDMA0_LENADDR 0x48 f7821b49345848 Linus Walleij 2021-05-03 50 #define IXP4XX_PCI_ATPDMA1_AHBADDR 0x4c f7821b49345848 Linus Walleij 2021-05-03 51 #define IXP4XX_PCI_ATPDMA1_PCIADDR 0x50 f7821b49345848 Linus Walleij 2021-05-03 52 #define IXP4XX_PCI_ATPDMA1_LENADDR 0x54 f7821b49345848 Linus Walleij 2021-05-03 53 :::::: The code at line 38 was first introduced by commit :::::: f7821b49345848246692c6e0aa170c8bc6723f86 PCI: ixp4xx: Add a new driver for IXP4xx :::::: TO: Linus Walleij <linus.walleij(a)linaro.org&gt; :::::: CC: Linus Walleij <linus.walleij(a)linaro.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org