Hi "Maíra, Thank you for the patch! Yet something to improve: [auto build test ERROR on lee-backlight/for-backlight-next] [also build test ERROR on v5.15-rc7 next-20211026] [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/Ma-ra-Canal/backlight-lp855x-Switch-to-atomic-PWM-API/20211024-103835 base: https://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight.git for-backlight-next config: riscv-buildonly-randconfig-r005-20211026 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project e5fb79b31424267704e9d2d9674089fd7316453e) 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/f79ab2c306d1c5d666df34f3062f9f1a0b8e4448 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Ma-ra-Canal/backlight-lp855x-Switch-to-atomic-PWM-API/20211024-103835 git checkout f79ab2c306d1c5d666df34f3062f9f1a0b8e4448 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=riscv If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): In file included from drivers/video/backlight/lp855x_bl.c:10: In file included from include/linux/i2c.h:18: In file included from include/linux/regulator/consumer.h:35: In file included from include/linux/suspend.h:5: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: 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:136: include/asm-generic/io.h:464:31: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic] val = __raw_readb(PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:477:61: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic] val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ 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/video/backlight/lp855x_bl.c:10: In file included from include/linux/i2c.h:18: In file included from include/linux/regulator/consumer.h:35: In file included from include/linux/suspend.h:5: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: 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:136: include/asm-generic/io.h:490:61: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ 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/video/backlight/lp855x_bl.c:10: In file included from include/linux/i2c.h:18: In file included from include/linux/regulator/consumer.h:35: In file included from include/linux/suspend.h:5: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: 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:136: include/asm-generic/io.h:501:33: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic] __raw_writeb(value, PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:511:59: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic] __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:521:59: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic] __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:1024:55: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic] return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port; ~~~~~~~~~~ ^ >> drivers/video/backlight/lp855x_bl.c:242:6: error: variable 'pwm' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized] if (!lp->pwm) { ^~~~~~~~ drivers/video/backlight/lp855x_bl.c:260:18: note: uninitialized use occurs here pwm_apply_state(pwm, &state); ^~~ drivers/video/backlight/lp855x_bl.c:242:2: note: remove the 'if' if its condition is always true if (!lp->pwm) { ^~~~~~~~~~~~~~ drivers/video/backlight/lp855x_bl.c:238:24: note: initialize the variable 'pwm' to silence this warning struct pwm_device *pwm; ^ = NULL 8 errors generated. vim +242 drivers/video/backlight/lp855x_bl.c 7be865ab8634d4e Kim, Milo 2012-03-23 233 8cc9764c9c7d01a Kim, Milo 2012-12-17 234 static void lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br) 8cc9764c9c7d01a Kim, Milo 2012-12-17 235 { 8cc9764c9c7d01a Kim, Milo 2012-12-17 236 unsigned int period = lp->pdata->period_ns; 8cc9764c9c7d01a Kim, Milo 2012-12-17 237 unsigned int duty = br * period / max_br; 8cc9764c9c7d01a Kim, Milo 2012-12-17 238 struct pwm_device *pwm; f79ab2c306d1c5d Maíra Canal 2021-10-23 239 struct pwm_state state; 8cc9764c9c7d01a Kim, Milo 2012-12-17 240 8cc9764c9c7d01a Kim, Milo 2012-12-17 241 /* request pwm device with the consumer name */ 8cc9764c9c7d01a Kim, Milo 2012-12-17 @242 if (!lp->pwm) { 8cc9764c9c7d01a Kim, Milo 2012-12-17 243 pwm = devm_pwm_get(lp->dev, lp->chipname); 8cc9764c9c7d01a Kim, Milo 2012-12-17 244 if (IS_ERR(pwm)) 8cc9764c9c7d01a Kim, Milo 2012-12-17 245 return; 8cc9764c9c7d01a Kim, Milo 2012-12-17 246 8cc9764c9c7d01a Kim, Milo 2012-12-17 247 lp->pwm = pwm; 8cc9764c9c7d01a Kim, Milo 2012-12-17 248 } 8cc9764c9c7d01a Kim, Milo 2012-12-17 249 f79ab2c306d1c5d Maíra Canal 2021-10-23 250 pwm_init_state(pwm, &state); f79ab2c306d1c5d Maíra Canal 2021-10-23 251 f79ab2c306d1c5d Maíra Canal 2021-10-23 252 state.duty_cycle = duty; f79ab2c306d1c5d Maíra Canal 2021-10-23 253 state.period = period; f79ab2c306d1c5d Maíra Canal 2021-10-23 254 8cc9764c9c7d01a Kim, Milo 2012-12-17 255 if (duty) f79ab2c306d1c5d Maíra Canal 2021-10-23 256 state.enabled = true; 8cc9764c9c7d01a Kim, Milo 2012-12-17 257 else f79ab2c306d1c5d Maíra Canal 2021-10-23 258 state.enabled = false; f79ab2c306d1c5d Maíra Canal 2021-10-23 259 f79ab2c306d1c5d Maíra Canal 2021-10-23 260 pwm_apply_state(pwm, &state); 8cc9764c9c7d01a Kim, Milo 2012-12-17 261 } 8cc9764c9c7d01a Kim, Milo 2012-12-17 262 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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