Hi Michael, Thank you for the patch! Yet something to improve: [auto build test ERROR on wsa/i2c/for-next] [also build test ERROR on v5.9 next-20201013] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Michael-Wu/i2c-designware-fix-sl... base: https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/for-next config: riscv-randconfig-r036-20201014 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project e7fe3c6dfede8d5781bd000741c3dea7088307a4) 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 riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://github.com/0day-ci/linux/commit/6bb28b0fda0a3f133918077bbfb1c6fe4... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Michael-Wu/i2c-designware-fix-slave-omitted-IC_INTR_STOP_DET/20201014-132759 git checkout 6bb28b0fda0a3f133918077bbfb1c6fe4809bf30 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv 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/hardirq.h:10: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:13: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:148: include/asm-generic/io.h:564:9: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] return inw(addr); ^~~~~~~~~ arch/riscv/include/asm/io.h:55:76: note: expanded from macro 'inw' #define inw(c) ({ u16 __v; __io_pbr(); __v = readw_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; }) ~~~~~~~~~~ ^ arch/riscv/include/asm/mmio.h:88:76: note: expanded from macro 'readw_cpu' #define readw_cpu(c) ({ u16 __r = le16_to_cpu((__force __le16)__raw_readw(c)); __r; }) ^ include/uapi/linux/byteorder/little_endian.h:36:51: note: expanded from macro '__le16_to_cpu' #define __le16_to_cpu(x) ((__force __u16)(__le16)(x)) ^ In file included from drivers/i2c/busses/i2c-designware-slave.c:13: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:10: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:13: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:148: include/asm-generic/io.h:572:9: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] return inl(addr); ^~~~~~~~~ arch/riscv/include/asm/io.h:56:76: note: expanded from macro 'inl' #define inl(c) ({ u32 __v; __io_pbr(); __v = readl_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; }) ~~~~~~~~~~ ^ arch/riscv/include/asm/mmio.h:89:76: note: expanded from macro 'readl_cpu' #define readl_cpu(c) ({ u32 __r = le32_to_cpu((__force __le32)__raw_readl(c)); __r; }) ^ include/uapi/linux/byteorder/little_endian.h:34:51: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) ^ In file included from drivers/i2c/busses/i2c-designware-slave.c:13: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:10: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:13: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:148: include/asm-generic/io.h:580:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outb(value, addr); ^~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:58:68: note: expanded from macro 'outb' #define outb(v,c) ({ __io_pbw(); writeb_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); }) ~~~~~~~~~~ ^ arch/riscv/include/asm/mmio.h:91:52: note: expanded from macro 'writeb_cpu' #define writeb_cpu(v, c) ((void)__raw_writeb((v), (c))) ^ In file included from drivers/i2c/busses/i2c-designware-slave.c:13: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:10: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:13: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:148: include/asm-generic/io.h:588:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outw(value, addr); ^~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:59:68: note: expanded from macro 'outw' #define outw(v,c) ({ __io_pbw(); writew_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); }) ~~~~~~~~~~ ^ arch/riscv/include/asm/mmio.h:92:76: note: expanded from macro 'writew_cpu' #define writew_cpu(v, c) ((void)__raw_writew((__force u16)cpu_to_le16(v), (c))) ^ In file included from drivers/i2c/busses/i2c-designware-slave.c:13: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:10: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:13: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:148: include/asm-generic/io.h:596:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outl(value, addr); ^~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:60:68: note: expanded from macro 'outl' #define outl(v,c) ({ __io_pbw(); writel_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); }) ~~~~~~~~~~ ^ arch/riscv/include/asm/mmio.h:93:76: note: expanded from macro 'writel_cpu' #define writel_cpu(v, c) ((void)__raw_writel((__force u32)cpu_to_le32(v), (c))) ^ In file included from drivers/i2c/busses/i2c-designware-slave.c:13: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:10: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:13: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:148: include/asm-generic/io.h:1017:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port; ~~~~~~~~~~ ^ dev->status = STATUS_WRITE_IN_PROGRESS ^ ; if (dev->status != STATUS_IDEL) { ^ 7 warnings and 2 errors generated. vim +181 drivers/i2c/busses/i2c-designware-slave.c 151 152 /* 153 * Interrupt service routine. This gets called whenever an I2C slave interrupt 154 * occurs. 155 */ 156 157 static int i2c_dw_irq_handler_slave(struct dw_i2c_dev *dev) 158 { 159 u32 raw_stat, stat, enabled, tmp; 160 u8 val = 0, slave_activity; 161 162 regmap_read(dev->map, DW_IC_ENABLE, &enabled); 163 regmap_read(dev->map, DW_IC_RAW_INTR_STAT, &raw_stat); 164 regmap_read(dev->map, DW_IC_STATUS, &tmp); 165 slave_activity = ((tmp & DW_IC_STATUS_SLAVE_ACTIVITY) >> 6); 166 167 if (!enabled || !(raw_stat & ~DW_IC_INTR_ACTIVITY) || !dev->slave) 168 return 0; 169 170 stat = i2c_dw_read_clear_intrbits_slave(dev); 171 dev_dbg(dev->dev, 172 "%#x STATUS SLAVE_ACTIVITY=%#x : RAW_INTR_STAT=%#x : INTR_STAT=%#x\n", 173 enabled, slave_activity, raw_stat, stat); 174 175 if (stat & DW_IC_INTR_RX_FULL) { 176 if (dev->status != STATUS_WRITE_IN_PROGRESS) { 177 if (dev->status != STATUS_IDLE) 178 i2c_slave_event(dev->slave, I2C_SLAVE_STOP, 179 &val); 180 182 i2c_slave_event(dev->slave, I2C_SLAVE_WRITE_REQUESTED, 183 &val); 184 } 185 186 regmap_read(dev->map, DW_IC_DATA_CMD, &tmp); 187 val = tmp; 188 189 if (!i2c_slave_event(dev->slave, I2C_SLAVE_WRITE_RECEIVED, 190 &val)) 191 dev_vdbg(dev->dev, "Byte %X acked!", val); 192 } 193 194 if (stat & DW_IC_INTR_RD_REQ) { 196 dev->status = STATUS_IDLE; 197 i2c_slave_event(dev->slave, I2C_SLAVE_STOP, &val); 198 } 199 200 if (slave_activity) { 201 regmap_read(dev->map, DW_IC_CLR_RD_REQ, &tmp); 202 regmap_read(dev->map, DW_IC_CLR_RX_UNDER, &tmp); 203 204 dev->status = STATUS_READ_IN_PROGRESS; 205 i2c_slave_event(dev->slave, I2C_SLAVE_READ_REQUESTED, 206 &val); 207 regmap_write(dev->map, DW_IC_DATA_CMD, val); 208 } 209 } 210 211 if (stat & DW_IC_INTR_RX_DONE) { 212 i2c_slave_event(dev->slave, I2C_SLAVE_READ_PROCESSED, &val); 213 regmap_read(dev->map, DW_IC_CLR_RX_DONE, &tmp); 214 215 dev->status = STATUS_IDLE; 216 i2c_slave_event(dev->slave, I2C_SLAVE_STOP, &val); 217 } 218 219 if (stat & DW_IC_INTR_STOP_DET) { 220 if (dev->status != STATUS_IDLE) { 221 dev->status = STATUS_IDLE; 222 223 i2c_slave_event(dev->slave, I2C_SLAVE_STOP, &val); 224 } 225 } 226 227 return 1; 228 } 229 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org