Hi Nirmoy, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: cd560d8023bf73c94d755908c8d4a0994dd1ec34 commit: eb14235668777baddfc77ce4f72ecfa2ea85ca55 [11288/11658] drm/amdgpu: do not keep debugfs dentry config: s390-randconfig-r031-20210217 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476) 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 # install s390 cross compiling tool for clang build # apt-get install binutils-s390x-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout eb14235668777baddfc77ce4f72ecfa2ea85ca55 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 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 >>): include/uapi/linux/swab.h:19:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \ ^ In file included from drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:31: In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu.h:52: In file included from include/linux/pci.h:39: In file included from include/linux/io.h:13: In file included from arch/s390/include/asm/io.h:80: include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32' ___constant_swab32(x) : \ ^ include/uapi/linux/swab.h:20:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ ^ In file included from drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:31: In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu.h:52: In file included from include/linux/pci.h:39: In file included from include/linux/io.h:13: In file included from arch/s390/include/asm/io.h:80: include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32' ___constant_swab32(x) : \ ^ include/uapi/linux/swab.h:21:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ ^ In file included from drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:31: In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu.h:52: In file included from include/linux/pci.h:39: In file included from include/linux/io.h:13: In file included from arch/s390/include/asm/io.h:80: include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32' ___constant_swab32(x) : \ ^ include/uapi/linux/swab.h:22:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0xff000000UL) >> 24))) ^ In file included from drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:31: In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu.h:52: In file included from include/linux/pci.h:39: In file included from include/linux/io.h:13: In file included from arch/s390/include/asm/io.h:80: include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:120:12: note: expanded from macro '__swab32' __fswab32(x)) ^ In file included from drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:31: In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu.h:52: In file included from include/linux/pci.h:39: In file included from include/linux/io.h:13: In file included from arch/s390/include/asm/io.h:80: include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writeb(value, PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ struct dentry *amdgpu_ras_debugfs_create_ctrl_node(struct amdgpu_device *adev) ^ drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:1140:1: note: declare 'static' if the function is not intended to be used outside of this translation unit struct dentry *amdgpu_ras_debugfs_create_ctrl_node(struct amdgpu_device *adev) ^ static 21 warnings generated. vim +/amdgpu_ras_debugfs_create_ctrl_node +1140 drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c 1120 1121 /** 1122 * DOC: AMDGPU RAS Reboot Behavior for Unrecoverable Errors 1123 * 1124 * Normally when there is an uncorrectable error, the driver will reset 1125 * the GPU to recover. However, in the event of an unrecoverable error, 1126 * the driver provides an interface to reboot the system automatically 1127 * in that event. 1128 * 1129 * The following file in debugfs provides that interface: 1130 * /sys/kernel/debug/dri/[0/1/2...]/ras/auto_reboot 1131 * 1132 * Usage: 1133 * 1134 * .. code-block:: bash 1135 * 1136 * echo true > .../ras/auto_reboot 1137 * 1138 */ 1139 /* debugfs begin */ 1141 { 1142 struct amdgpu_ras *con = amdgpu_ras_get_context(adev); 1143 struct dentry *dir; 1144 struct drm_minor *minor = adev_to_drm(adev)->primary; 1145 1146 dir = debugfs_create_dir(RAS_FS_NAME, minor->debugfs_root); 1147 debugfs_create_file("ras_ctrl", S_IWUGO | S_IRUGO, dir, adev, 1148 &amdgpu_ras_debugfs_ctrl_ops); 1149 debugfs_create_file("ras_eeprom_reset", S_IWUGO | S_IRUGO, dir, adev, 1150 &amdgpu_ras_debugfs_eeprom_ops); 1151 1152 /* 1153 * After one uncorrectable error happens, usually GPU recovery will 1154 * be scheduled. But due to the known problem in GPU recovery failing 1155 * to bring GPU back, below interface provides one direct way to 1156 * user to reboot system automatically in such case within 1157 * ERREVENT_ATHUB_INTERRUPT generated. Normal GPU recovery routine 1158 * will never be called. 1159 */ 1160 debugfs_create_bool("auto_reboot", S_IWUGO | S_IRUGO, dir, &con->reboot); 1161 1162 /* 1163 * User could set this not to clean up hardware's error count register 1164 * of RAS IPs during ras recovery. 1165 */ 1166 debugfs_create_bool("disable_ras_err_cnt_harvest", 0644, dir, 1167 &con->disable_ras_err_cnt_harvest); 1168 return dir; 1169 } 1170 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org