Hi Peilin, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v6.1-rc2 next-20221028] [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/Peilin-Ye/coredump-Use-vmsplice_to_pipe-for-pipes-in-dump_emit_page/20221029-085307 patch link: https://lore.kernel.org/r/20221029005147.2553-1-yepeilin.cs%40gmail.com patch subject: [PATCH v1] coredump: Use vmsplice_to_pipe() for pipes in dump_emit_page() config: hexagon-randconfig-r041-20221029 compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920) 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 # https://github.com/intel-lab-lkp/linux/commit/49da2daf3c9dc6a687c0f64c047bec6199f232af git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Peilin-Ye/coredump-Use-vmsplice_to_pipe-for-pipes-in-dump_emit_page/20221029-085307 git checkout 49da2daf3c9dc6a687c0f64c047bec6199f232af # 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=hexagon SHELL=/bin/bash net/tls/ 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 net/tls/tls_sw.c:41: >> include/linux/splice.h:84:56: warning: declaration of 'struct iov_iter' will not be visible outside of this function [-Wvisibility] extern long vmsplice_to_pipe(struct file *file, struct iov_iter *iter, ^ In file included from net/tls/tls_sw.c:44: In file included from include/net/strparser.h:11: In file included from include/linux/skbuff.h:17: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/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/hexagon/include/asm/io.h:334: 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/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 net/tls/tls_sw.c:44: In file included from include/net/strparser.h:11: In file included from include/linux/skbuff.h:17: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/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/hexagon/include/asm/io.h:334: 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/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 net/tls/tls_sw.c:44: In file included from include/net/strparser.h:11: In file included from include/linux/skbuff.h:17: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/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/hexagon/include/asm/io.h:334: 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); ~~~~~~~~~~ ^ 7 warnings generated. vim +84 include/linux/splice.h 64 65 typedef int (splice_actor)(struct pipe_inode_info *, struct pipe_buffer *, 66 struct splice_desc *); 67 typedef int (splice_direct_actor)(struct pipe_inode_info *, 68 struct splice_desc *); 69 70 extern ssize_t splice_from_pipe(struct pipe_inode_info *, struct file *, 71 loff_t *, size_t, unsigned int, 72 splice_actor *); 73 extern ssize_t __splice_from_pipe(struct pipe_inode_info *, 74 struct splice_desc *, splice_actor *); 75 extern ssize_t splice_to_pipe(struct pipe_inode_info *, 76 struct splice_pipe_desc *); 77 extern ssize_t add_to_pipe(struct pipe_inode_info *, 78 struct pipe_buffer *); 79 extern ssize_t splice_direct_to_actor(struct file *, struct splice_desc *, 80 splice_direct_actor *); 81 extern long do_splice(struct file *in, loff_t *off_in, 82 struct file *out, loff_t *off_out, 83 size_t len, unsigned int flags); > 84 extern long vmsplice_to_pipe(struct file *file, struct iov_iter *iter, 85 unsigned int flags); 86 -- 0-DAY CI Kernel Test Service https://01.org/lkp