Hi Robert, FYI, the error/warning still remains. tree: https://github.com/Freescale/linux-fslc 5.4-2.3.x-imx head: ef8eb7d4787bee4be718a83b6c73fb8cc7e8f158 commit: c40c90f2d3265167edd6384dd8691dc88f78308d [10205/19343] LF-811-1: drm/bridge: Add driver for legacy Freescale Seiko 43WVFIG adapter config: m68k-randconfig-r002-20210611 (attached as .config) compiler: m68k-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 # https://github.com/Freescale/linux-fslc/commit/c40c90f2d3265167edd6384dd8... git remote add freescale-fslc https://github.com/Freescale/linux-fslc git fetch --no-tags freescale-fslc 5.4-2.3.x-imx git checkout c40c90f2d3265167edd6384dd8691dc88f78308d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from include/linux/kernel.h:11, from include/linux/list.h:9, from include/linux/agp_backend.h:33, from include/drm/drmP.h:35, from drivers/gpu/drm/bridge/nxp-seiko-43wvfig.c:17: include/linux/scatterlist.h: In function 'sg_set_buf': arch/m68k/include/asm/page_mm.h:169:49: warning: ordered comparison of pointer with null pointer [-Wextra] 169 | #define virt_addr_valid(kaddr) ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory) | ^~ include/linux/compiler.h:78:42: note: in definition of macro 'unlikely' 78 | # define unlikely(x) __builtin_expect(!!(x), 0) | ^ include/linux/scatterlist.h:143:2: note: in expansion of macro 'BUG_ON' 143 | BUG_ON(!virt_addr_valid(buf)); | ^~~~~~ include/linux/scatterlist.h:143:10: note: in expansion of macro 'virt_addr_valid' 143 | BUG_ON(!virt_addr_valid(buf)); | ^~~~~~~~~~~~~~~ In file included from arch/m68k/include/asm/bug.h:32, from include/linux/bug.h:5, from include/linux/thread_info.h:12, from include/asm-generic/preempt.h:5, from ./arch/m68k/include/generated/asm/preempt.h:1, from include/linux/preempt.h:78, from arch/m68k/include/asm/irqflags.h:6, from include/linux/irqflags.h:16, from arch/m68k/include/asm/atomic.h:6, from include/linux/atomic.h:7, from include/linux/mutex.h:18, from include/linux/kernfs.h:12, from include/linux/sysfs.h:16, from include/linux/kobject.h:20, from include/linux/cdev.h:5, from include/drm/drmP.h:36, from drivers/gpu/drm/bridge/nxp-seiko-43wvfig.c:17: include/linux/dma-mapping.h: In function 'dma_map_resource': arch/m68k/include/asm/page_mm.h:169:49: warning: ordered comparison of pointer with null pointer [-Wextra] 169 | #define virt_addr_valid(kaddr) ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory) | ^~ include/asm-generic/bug.h:139:27: note: in definition of macro 'WARN_ON_ONCE' 139 | int __ret_warn_once = !!(condition); \ | ^~~~~~~~~ arch/m68k/include/asm/page_mm.h:170:25: note: in expansion of macro 'virt_addr_valid' 170 | #define pfn_valid(pfn) virt_addr_valid(pfn_to_virt(pfn)) | ^~~~~~~~~~~~~~~ include/linux/dma-mapping.h:355:19: note: in expansion of macro 'pfn_valid' 355 | if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr)))) | ^~~~~~~~~ drivers/gpu/drm/bridge/nxp-seiko-43wvfig.c: In function 'seiko_adapter_probe': 214 | adap->bridge.of_node = dev->of_node; | ^ In file included from drivers/gpu/drm/bridge/nxp-seiko-43wvfig.c:20: At top level: include/drm/drm_of.h:64:12: warning: 'drm_of_component_probe_with_match' defined but not used [-Wunused-function] 64 | static int drm_of_component_probe_with_match(struct device *dev, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +214 drivers/gpu/drm/bridge/nxp-seiko-43wvfig.c 166 167 static int seiko_adapter_probe(struct platform_device *pdev) 168 { 169 struct device *dev = &pdev->dev; 170 struct seiko_adapter *adap; 171 struct device_node *remote; 172 u32 bus_mode; 173 int port; 174 175 adap = devm_kzalloc(dev, sizeof(*adap), GFP_KERNEL); 176 if (!adap) 177 return -ENOMEM; 178 179 of_property_read_u32(dev->of_node, "bus_mode", &bus_mode); 180 if (bus_mode != 18 && bus_mode != 24) { 181 dev_err(dev, "Invalid bus_mode: %d\n", bus_mode); 182 return -EINVAL; 183 } 184 185 switch (bus_mode) { 186 case 18: 187 adap->bpc = 6; 188 adap->bus_format = MEDIA_BUS_FMT_RGB666_1X18; 189 break; 190 case 24: 191 adap->bpc = 8; 192 adap->bus_format = MEDIA_BUS_FMT_RGB888_1X24; 193 break; 194 } 195 196 for (port = 0; port < 2; port++) { 197 remote = of_graph_get_remote_node(dev->of_node, port, -1); 198 if (!remote) { 199 dev_err(dev, "No remote for port %d\n", port); 200 return -ENODEV; 201 } 202 adap->panel = of_drm_find_panel(remote); 203 if (!IS_ERR(adap->panel)) 204 break; 205 } 206 if (IS_ERR(adap->panel)) { 207 dev_err(dev, "No panel found: %ld\n", PTR_ERR(adap->panel)); 208 return PTR_ERR(adap->panel); 209 } 210 211 adap->dev = dev; 212 adap->bridge.driver_private = adap; 213 adap->bridge.funcs = &seiko_adapter_bridge_funcs; 215 216 drm_bridge_add(&adap->bridge); 217 218 return 0; 219 } 220 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org