Hi Stafford, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: bb1a1146467ad812bb65440696df0782e2bc63c8 commit: ded2ee36313c941f1a12b6f85cde295b575264ae openrisc: Add pci bus support date: 3 months ago config: openrisc-randconfig-s051-20221018 compiler: or1k-linux-gcc (GCC) 12.1.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.4-39-gce1a6720-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ded2ee36313c941f1a12b6f85cde295b575264ae git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout ded2ee36313c941f1a12b6f85cde295b575264ae # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=openrisc SHELL=/bin/bash drivers/pci/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot sparse warnings: (new ones prefixed by >>) drivers/pci/proc.c:148:17: sparse: sparse: cast to restricted __le16 drivers/pci/proc.c:148:17: sparse: sparse: cast to restricted __le16 drivers/pci/proc.c:148:17: sparse: sparse: cast to restricted __le16 >> drivers/pci/proc.c:148:17: sparse: sparse: restricted __le16 degrades to integer >> drivers/pci/proc.c:148:17: sparse: sparse: restricted __le16 degrades to integer drivers/pci/proc.c:148:17: sparse: sparse: cast to restricted __le16 drivers/pci/proc.c:148:17: sparse: sparse: cast to restricted __le16 drivers/pci/proc.c:157:17: sparse: sparse: cast to restricted __le32 drivers/pci/proc.c:157:17: sparse: sparse: cast to restricted __le32 drivers/pci/proc.c:157:17: sparse: sparse: cast to restricted __le32 >> drivers/pci/proc.c:157:17: sparse: sparse: restricted __le32 degrades to integer >> drivers/pci/proc.c:157:17: sparse: sparse: restricted __le32 degrades to integer drivers/pci/proc.c:157:17: sparse: sparse: cast to restricted __le32 drivers/pci/proc.c:157:17: sparse: sparse: cast to restricted __le32 drivers/pci/proc.c:166:17: sparse: sparse: cast to restricted __le16 drivers/pci/proc.c:166:17: sparse: sparse: cast to restricted __le16 drivers/pci/proc.c:166:17: sparse: sparse: cast to restricted __le16 drivers/pci/proc.c:166:17: sparse: sparse: restricted __le16 degrades to integer drivers/pci/proc.c:166:17: sparse: sparse: restricted __le16 degrades to integer drivers/pci/proc.c:166:17: sparse: sparse: cast to restricted __le16 drivers/pci/proc.c:166:17: sparse: sparse: cast to restricted __le16 vim +148 drivers/pci/proc.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 110 3c78bc61f5ef3b Ryan Desfosses 2014-04-18 111 static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf, 3c78bc61f5ef3b Ryan Desfosses 2014-04-18 112 size_t nbytes, loff_t *ppos) ^1da177e4c3f41 Linus Torvalds 2005-04-16 113 { 496ad9aa8ef448 Al Viro 2013-01-23 114 struct inode *ino = file_inode(file); 359745d78351c6 Muchun Song 2022-01-21 115 struct pci_dev *dev = pde_data(ino); ^1da177e4c3f41 Linus Torvalds 2005-04-16 116 int pos = *ppos; d9dda78bad8795 Al Viro 2013-03-31 117 int size = dev->cfg_size; eb627e17727ebe Matthew Garrett 2019-08-19 118 int cnt, ret; eb627e17727ebe Matthew Garrett 2019-08-19 119 eb627e17727ebe Matthew Garrett 2019-08-19 120 ret = security_locked_down(LOCKDOWN_PCI_ACCESS); eb627e17727ebe Matthew Garrett 2019-08-19 121 if (ret) eb627e17727ebe Matthew Garrett 2019-08-19 122 return ret; ^1da177e4c3f41 Linus Torvalds 2005-04-16 123 ^1da177e4c3f41 Linus Torvalds 2005-04-16 124 if (pos >= size) ^1da177e4c3f41 Linus Torvalds 2005-04-16 125 return 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 126 if (nbytes >= size) ^1da177e4c3f41 Linus Torvalds 2005-04-16 127 nbytes = size; ^1da177e4c3f41 Linus Torvalds 2005-04-16 128 if (pos + nbytes > size) ^1da177e4c3f41 Linus Torvalds 2005-04-16 129 nbytes = size - pos; ^1da177e4c3f41 Linus Torvalds 2005-04-16 130 cnt = nbytes; ^1da177e4c3f41 Linus Torvalds 2005-04-16 131 96d4f267e40f95 Linus Torvalds 2019-01-03 132 if (!access_ok(buf, cnt)) ^1da177e4c3f41 Linus Torvalds 2005-04-16 133 return -EINVAL; ^1da177e4c3f41 Linus Torvalds 2005-04-16 134 b3c32c4f9565f9 Huang Ying 2012-10-25 135 pci_config_pm_runtime_get(dev); b3c32c4f9565f9 Huang Ying 2012-10-25 136 ^1da177e4c3f41 Linus Torvalds 2005-04-16 137 if ((pos & 1) && cnt) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 138 unsigned char val; ^1da177e4c3f41 Linus Torvalds 2005-04-16 139 __get_user(val, buf); e04b0ea2e0f9c1 Brian King 2005-09-27 140 pci_user_write_config_byte(dev, pos, val); ^1da177e4c3f41 Linus Torvalds 2005-04-16 141 buf++; ^1da177e4c3f41 Linus Torvalds 2005-04-16 142 pos++; ^1da177e4c3f41 Linus Torvalds 2005-04-16 143 cnt--; ^1da177e4c3f41 Linus Torvalds 2005-04-16 144 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 145 ^1da177e4c3f41 Linus Torvalds 2005-04-16 146 if ((pos & 3) && cnt > 2) { f17a077e61b627 Harvey Harrison 2008-07-22 147 __le16 val; f17a077e61b627 Harvey Harrison 2008-07-22 @148 __get_user(val, (__le16 __user *) buf); e04b0ea2e0f9c1 Brian King 2005-09-27 149 pci_user_write_config_word(dev, pos, le16_to_cpu(val)); ^1da177e4c3f41 Linus Torvalds 2005-04-16 150 buf += 2; ^1da177e4c3f41 Linus Torvalds 2005-04-16 151 pos += 2; ^1da177e4c3f41 Linus Torvalds 2005-04-16 152 cnt -= 2; ^1da177e4c3f41 Linus Torvalds 2005-04-16 153 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 154 ^1da177e4c3f41 Linus Torvalds 2005-04-16 155 while (cnt >= 4) { f17a077e61b627 Harvey Harrison 2008-07-22 156 __le32 val; f17a077e61b627 Harvey Harrison 2008-07-22 @157 __get_user(val, (__le32 __user *) buf); e04b0ea2e0f9c1 Brian King 2005-09-27 158 pci_user_write_config_dword(dev, pos, le32_to_cpu(val)); ^1da177e4c3f41 Linus Torvalds 2005-04-16 159 buf += 4; ^1da177e4c3f41 Linus Torvalds 2005-04-16 160 pos += 4; ^1da177e4c3f41 Linus Torvalds 2005-04-16 161 cnt -= 4; ^1da177e4c3f41 Linus Torvalds 2005-04-16 162 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 163 ^1da177e4c3f41 Linus Torvalds 2005-04-16 164 if (cnt >= 2) { f17a077e61b627 Harvey Harrison 2008-07-22 165 __le16 val; f17a077e61b627 Harvey Harrison 2008-07-22 166 __get_user(val, (__le16 __user *) buf); e04b0ea2e0f9c1 Brian King 2005-09-27 167 pci_user_write_config_word(dev, pos, le16_to_cpu(val)); ^1da177e4c3f41 Linus Torvalds 2005-04-16 168 buf += 2; ^1da177e4c3f41 Linus Torvalds 2005-04-16 169 pos += 2; ^1da177e4c3f41 Linus Torvalds 2005-04-16 170 cnt -= 2; ^1da177e4c3f41 Linus Torvalds 2005-04-16 171 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 172 ^1da177e4c3f41 Linus Torvalds 2005-04-16 173 if (cnt) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 174 unsigned char val; ^1da177e4c3f41 Linus Torvalds 2005-04-16 175 __get_user(val, buf); e04b0ea2e0f9c1 Brian King 2005-09-27 176 pci_user_write_config_byte(dev, pos, val); ^1da177e4c3f41 Linus Torvalds 2005-04-16 177 pos++; ^1da177e4c3f41 Linus Torvalds 2005-04-16 178 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 179 b3c32c4f9565f9 Huang Ying 2012-10-25 180 pci_config_pm_runtime_put(dev); b3c32c4f9565f9 Huang Ying 2012-10-25 181 ^1da177e4c3f41 Linus Torvalds 2005-04-16 182 *ppos = pos; d9dda78bad8795 Al Viro 2013-03-31 183 i_size_write(ino, dev->cfg_size); ^1da177e4c3f41 Linus Torvalds 2005-04-16 184 return nbytes; ^1da177e4c3f41 Linus Torvalds 2005-04-16 185 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 186 :::::: The code at line 148 was first introduced by commit :::::: f17a077e61b627e58db5926bc474cf308318dad9 PCI: fixup sparse endianness warnings in proc.c :::::: TO: Harvey Harrison :::::: CC: Jesse Barnes -- 0-DAY CI Kernel Test Service https://01.org/lkp