Hi Donglin, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on rostedt-trace/for-next] [cannot apply to rostedt-trace/for-next-urgent] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Donglin-Peng/tracing-probe-add-a-char-type-to-print-the-character-value-of-traced-arguments/20221213-195552 patch link: https://lore.kernel.org/r/20221213115304.3964458-1-dolinux.peng%40gmail.com patch subject: [PATCH] tracing/probe: add a char type to print the character value of traced arguments config: s390-randconfig-r044-20221213 compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 6e4cea55f0d1104408b26ac574566a0e4de48036) 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://github.com/intel-lab-lkp/linux/commit/c09eb24f0c2c27ce649aed5360dcf3299b636de6 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Donglin-Peng/tracing-probe-add-a-char-type-to-print-the-character-value-of-traced-arguments/20221213-195552 git checkout c09eb24f0c2c27ce649aed5360dcf3299b636de6 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash kernel/trace/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot All warnings (new ones prefixed by >>): In file included from kernel/trace/trace_probe.c:14: In file included from kernel/trace/trace_probe.h:28: In file included from kernel/trace/trace.h:9: In file included from include/linux/clocksource.h:22: In file included from arch/s390/include/asm/io.h:75: include/asm-generic/io.h:547:31: 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:560:61: 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/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu' #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x)) ^ include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16' #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x)) ^ In file included from kernel/trace/trace_probe.c:14: In file included from kernel/trace/trace_probe.h:28: In file included from kernel/trace/trace.h:9: In file included from include/linux/clocksource.h:22: In file included from arch/s390/include/asm/io.h:75: include/asm-generic/io.h:573:61: 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:35:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32' #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x)) ^ In file included from kernel/trace/trace_probe.c:14: In file included from kernel/trace/trace_probe.h:28: In file included from kernel/trace/trace.h:9: In file included from include/linux/clocksource.h:22: In file included from arch/s390/include/asm/io.h:75: include/asm-generic/io.h:584:33: 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:594:59: 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:604:59: 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:692:20: 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:700:20: 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:708:20: 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:717:21: 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:726:21: 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:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ >> kernel/trace/trace_probe.c:53:1: warning: no previous prototype for function 'print_type_char' [-Wmissing-prototypes] DEFINE_BASIC_PRINT_TYPE_FUNC(char, u8, "%c") ^ kernel/trace/trace_probe.c:34:5: note: expanded from macro 'DEFINE_BASIC_PRINT_TYPE_FUNC' int PRINT_TYPE_FUNC_NAME(tname)(struct trace_seq *s, void *data, void *ent)\ ^ kernel/trace/trace_probe.h:146:36: note: expanded from macro 'PRINT_TYPE_FUNC_NAME' #define PRINT_TYPE_FUNC_NAME(type) print_type_##type ^ :93:1: note: expanded from here print_type_char ^ kernel/trace/trace_probe.c:53:1: note: declare 'static' if the function is not intended to be used outside of this translation unit DEFINE_BASIC_PRINT_TYPE_FUNC(char, u8, "%c") ^ static kernel/trace/trace_probe.c:33:58: note: expanded from macro 'DEFINE_BASIC_PRINT_TYPE_FUNC' #define DEFINE_BASIC_PRINT_TYPE_FUNC(tname, type, fmt) \ ^ 13 warnings generated. vim +/print_type_char +53 kernel/trace/trace_probe.c 40 41 DEFINE_BASIC_PRINT_TYPE_FUNC(u8, u8, "%u") 42 DEFINE_BASIC_PRINT_TYPE_FUNC(u16, u16, "%u") 43 DEFINE_BASIC_PRINT_TYPE_FUNC(u32, u32, "%u") 44 DEFINE_BASIC_PRINT_TYPE_FUNC(u64, u64, "%Lu") 45 DEFINE_BASIC_PRINT_TYPE_FUNC(s8, s8, "%d") 46 DEFINE_BASIC_PRINT_TYPE_FUNC(s16, s16, "%d") 47 DEFINE_BASIC_PRINT_TYPE_FUNC(s32, s32, "%d") 48 DEFINE_BASIC_PRINT_TYPE_FUNC(s64, s64, "%Ld") 49 DEFINE_BASIC_PRINT_TYPE_FUNC(x8, u8, "0x%x") 50 DEFINE_BASIC_PRINT_TYPE_FUNC(x16, u16, "0x%x") 51 DEFINE_BASIC_PRINT_TYPE_FUNC(x32, u32, "0x%x") 52 DEFINE_BASIC_PRINT_TYPE_FUNC(x64, u64, "0x%Lx") > 53 DEFINE_BASIC_PRINT_TYPE_FUNC(char, u8, "%c") 54 -- 0-DAY CI Kernel Test Service https://01.org/lkp