Hi, [auto build test WARNING on pci/next] [also build test WARNING on v4.7-rc3 next-20160616] [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/Shawn-Lin/Documentation-bindings-add-dt-doc-for-Rockchip-PCIe-controller/20160616-095337 base: https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next config: arm64-allyesconfig (attached as .config) compiler: aarch64-linux-gnu-gcc (Debian 5.3.1-8) 5.3.1 20160205 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=arm64 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 warnings (new ones prefixed by >>): drivers/pci/host/pcie-rockchip.c: In function 'rockchip_pcie_probe': >> drivers/pci/host/pcie-rockchip.c:995:6: warning: 'mem_size' may be used uninitialized in this function [-Wmaybe-uninitialized] u32 mem_size; ^ >> drivers/pci/host/pcie-rockchip.c:1094:9: warning: 'mem_bus_addr' may be used uninitialized in this function [-Wmaybe-uninitialized] err = rockchip_pcie_prog_ob_atu(port, reg_no + 1, ^ >> drivers/pci/host/pcie-rockchip.c:993:6: warning: 'io_size' may be used uninitialized in this function [-Wmaybe-uninitialized] u32 io_size; ^ >> drivers/pci/host/pcie-rockchip.c:1115:9: warning: 'io_bus_addr' may be used uninitialized in this function [-Wmaybe-uninitialized] err = rockchip_pcie_prog_ob_atu(port, ^ >> drivers/pci/host/pcie-rockchip.c:1128:26: warning: 'busn' may be used uninitialized in this function [-Wmaybe-uninitialized] port->root_bus_nr = busn->start; ^ vim +/mem_size +995 drivers/pci/host/pcie-rockchip.c 987 struct resource_entry *win; 988 resource_size_t io_base; 989 struct resource *busn; 990 struct resource *mem; 991 struct resource *io; 992 phys_addr_t io_bus_addr; > 993 u32 io_size; 994 phys_addr_t mem_bus_addr; > 995 u32 mem_size; 996 int reg_no; 997 int err = 0; 998 int offset = 0; 999 1000 LIST_HEAD(res); 1001 1002 if (!dev->of_node) 1003 return -ENODEV; 1004 1005 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL); 1006 if (!port) 1007 return -ENOMEM; 1008 1009 port->dev = dev; 1010 1011 err = rockchip_pcie_parse_dt(port); 1012 if (err) 1013 return err; 1014 1015 err = clk_prepare_enable(port->aclk_pcie); 1016 if (err) { 1017 dev_err(dev, "Unable to enable aclk_pcie clock.\n"); 1018 goto err_aclk_pcie; 1019 } 1020 1021 err = clk_prepare_enable(port->aclk_perf_pcie); 1022 if (err) { 1023 dev_err(dev, "Unable to enable aclk_perf_pcie clock.\n"); 1024 goto err_aclk_perf_pcie; 1025 } 1026 1027 err = clk_prepare_enable(port->hclk_pcie); 1028 if (err) { 1029 dev_err(dev, "Unable to enable hclk_pcie clock.\n"); 1030 goto err_hclk_pcie; 1031 } 1032 1033 err = clk_prepare_enable(port->clk_pcie_pm); 1034 if (err) { 1035 dev_err(dev, "Unable to enable hclk_pcie clock.\n"); 1036 goto err_pcie_pm; 1037 } 1038 1039 err = rockchip_pcie_set_vpcie(port); 1040 if (err) { 1041 dev_err(port->dev, "Fail to set vpcie regulator.\n"); 1042 goto err_set_vpcie; 1043 } 1044 1045 err = rockchip_pcie_init_port(port); 1046 if (err) 1047 goto err_vpcie; 1048 1049 platform_set_drvdata(pdev, port); 1050 1051 rockchip_pcie_enable_interrupts(port); 1052 1053 err = rockchip_pcie_init_irq_domain(port); 1054 if (err < 0) 1055 goto err_vpcie; 1056 1057 err = of_pci_get_host_bridge_resources(dev->of_node, 0, 0xff, 1058 &res, &io_base); 1059 if (err) 1060 goto err_vpcie; 1061 1062 /* Get the I/O and memory ranges from DT */ 1063 resource_list_for_each_entry(win, &res) { 1064 switch (resource_type(win->res)) { 1065 case IORESOURCE_IO: 1066 io = win->res; 1067 io->name = "I/O"; 1068 io_size = resource_size(io); 1069 io_bus_addr = io->start - win->offset; 1070 err = pci_remap_iospace(io, io_base); 1071 if (err) { 1072 dev_warn(port->dev, "error %d: failed to map resource %pR\n", 1073 err, io); 1074 continue; 1075 } 1076 break; 1077 case IORESOURCE_MEM: 1078 mem = win->res; 1079 mem->name = "MEM"; 1080 mem_size = resource_size(mem); 1081 mem_bus_addr = mem->start - win->offset; 1082 break; 1083 case 0: 1084 break; 1085 case IORESOURCE_BUS: 1086 busn = win->res; 1087 break; 1088 default: 1089 continue; 1090 } 1091 } 1092 1093 for (reg_no = 0; reg_no < (mem_size >> 20); reg_no++) { > 1094 err = rockchip_pcie_prog_ob_atu(port, reg_no + 1, 1095 AXI_WRAPPER_MEM_WRITE, 1096 20 - 1, 1097 mem_bus_addr + 1098 (reg_no << 20), 1099 0); 1100 if (err) { 1101 dev_err(dev, "Program RC mem outbound atu failed\n"); 1102 goto err_vpcie; 1103 } 1104 } 1105 1106 err = rockchip_pcie_prog_ib_atu(port, 2, 32 - 1, 0x0, 0); 1107 if (err) { 1108 dev_err(dev, "Program RC mem inbound atu failed\n"); 1109 goto err_vpcie; 1110 } 1111 1112 offset = mem_size >> 20; 1113 1114 for (reg_no = 0; reg_no < (io_size >> 20); reg_no++) { > 1115 err = rockchip_pcie_prog_ob_atu(port, 1116 reg_no + 1 + offset, 1117 AXI_WRAPPER_IO_WRITE, 1118 20 - 1, 1119 io_bus_addr + 1120 (reg_no << 20), 1121 0); 1122 if (err) { 1123 dev_err(dev, "Program RC io outbound atu failed\n"); 1124 goto err_vpcie; 1125 } 1126 } 1127 > 1128 port->root_bus_nr = busn->start; 1129 1130 bus = pci_scan_root_bus(&pdev->dev, 0, 1131 &rockchip_pcie_ops, port, &res); --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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