Hi, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on drm-tip/drm-tip] url: https://github.com/intel-lab-lkp/linux/commits/priyanka-dandamudi-intel-com/Add-support-for-LMEM-PCIe-resizable-bar/20220711-014151 base: git://anongit.freedesktop.org/drm/drm-tip drm-tip config: i386-randconfig-a013 (https://download.01.org/0day-ci/archive/20220711/202207110340.zwofgDuU-lkp@xxxxxxxxx/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 6ce63e267aab79ca87bf63453d34dd3909ab978d) 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://github.com/intel-lab-lkp/linux/commit/fb47ead5e629b3aaaa718d85fb2fb960e77ebe61 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review priyanka-dandamudi-intel-com/Add-support-for-LMEM-PCIe-resizable-bar/20220711-014151 git checkout fb47ead5e629b3aaaa718d85fb2fb960e77ebe61 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/gpu/drm/i915/ If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/gpu/drm/i915/gt/intel_region_lmem.c:70:44: warning: result of comparison of constant 4294967296 with expression of type 'resource_size_t' (aka 'unsigned int') is always false [-Wtautological-constant-out-of-range-compare] IORESOURCE_MEM_64) && root_res->start > 0x100000000ull) ~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~ 1 warning generated. vim +70 drivers/gpu/drm/i915/gt/intel_region_lmem.c 46 47 #define LMEM_BAR_NUM 2 48 static void i915_resize_lmem_bar(struct drm_i915_private *i915, resource_size_t lmem_size) 49 { 50 struct pci_dev *pdev = to_pci_dev(i915->drm.dev); 51 struct pci_bus *root = pdev->bus; 52 struct resource *root_res; 53 resource_size_t rebar_size; 54 u32 pci_cmd; 55 int i; 56 57 rebar_size = roundup_pow_of_two(pci_resource_len(pdev, LMEM_BAR_NUM)); 58 59 if (rebar_size != roundup_pow_of_two(lmem_size)) 60 rebar_size = lmem_size; 61 else 62 return; 63 64 /* Find out if root bus contains 64bit memory addressing */ 65 while (root->parent) 66 root = root->parent; 67 68 pci_bus_for_each_resource(root, root_res, i) { 69 if (root_res && root_res->flags & (IORESOURCE_MEM | > 70 IORESOURCE_MEM_64) && root_res->start > 0x100000000ull) 71 break; 72 } 73 74 /* pci_resize_resource will fail anyways */ 75 if (!root_res) { 76 drm_info(&i915->drm, "Can't resize LMEM BAR - platform support is missing\n"); 77 return; 78 } 79 80 /* First disable PCI memory decoding references */ 81 pci_read_config_dword(pdev, PCI_COMMAND, &pci_cmd); 82 pci_write_config_dword(pdev, PCI_COMMAND, 83 pci_cmd & ~PCI_COMMAND_MEMORY); 84 85 _resize_bar(i915, LMEM_BAR_NUM, rebar_size); 86 87 pci_assign_unassigned_bus_resources(pdev->bus); 88 pci_write_config_dword(pdev, PCI_COMMAND, pci_cmd); 89 } 90 -- 0-DAY CI Kernel Test Service https://01.org/lkp
