Hi Aswath, I love your patch! Perhaps something to improve: [auto build test WARNING on robh/for-next] [also build test WARNING on linus/master ulf-hansson-mmc-mirror/next v5.18-rc3 next-20220414] [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/intel-lab-lkp/linux/commits/Aswath-Govindraju/MMC-Add-quirk-to-set-the-TESTCD-bit/20220418-182325 base: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next config: riscv-randconfig-r016-20220418 (https://download.01.org/0day-ci/archive/20220418/202204182202.yPPV6YZI-lkp@xxxxxxxxx/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 429cbac0390654f90bba18a41799464adf31a5ec) 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/intel-lab-lkp/linux/commit/a7d917691f55e240b1ab0abf36b0b39d1194a323 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Aswath-Govindraju/MMC-Add-quirk-to-set-the-TESTCD-bit/20220418-182325 git checkout a7d917691f55e240b1ab0abf36b0b39d1194a323 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/mmc/host/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): In file included from drivers/mmc/host/sdhci_am654.c:9: In file included from include/linux/iopoll.h:14: 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: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __raw_readb(PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu' #define __le16_to_cpu(x) ((__force __u16)(__le16)(x)) ^ In file included from drivers/mmc/host/sdhci_am654.c:9: In file included from include/linux/iopoll.h:14: 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: 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/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) ^ In file included from drivers/mmc/host/sdhci_am654.c:9: In file included from include/linux/iopoll.h:14: 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: 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:1024:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port; ~~~~~~~~~~ ^ >> drivers/mmc/host/sdhci_am654.c:375:6: warning: no previous prototype for function 'sdhci_am654_reset' [-Wmissing-prototypes] void sdhci_am654_reset(struct sdhci_host *host, u8 mask) ^ drivers/mmc/host/sdhci_am654.c:375:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void sdhci_am654_reset(struct sdhci_host *host, u8 mask) ^ static 8 warnings generated. vim +/sdhci_am654_reset +375 drivers/mmc/host/sdhci_am654.c 374 > 375 void sdhci_am654_reset(struct sdhci_host *host, u8 mask) 376 { 377 u8 ctrl; 378 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 379 struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host); 380 381 sdhci_reset(host, mask); 382 383 if (sdhci_am654->quirks & SDHCI_AM654_QUIRK_FORCE_CDTEST) { 384 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 385 ctrl |= SDHCI_CTRL_CDTEST_INS | SDHCI_CTRL_CDTEST_EN; 386 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 387 } 388 } 389 -- 0-DAY CI Kernel Test Service https://01.org/lkp
