Hi Hao, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v5.17-rc1 next-20220124] [cannot apply to horms-ipvs/master] [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/Hao-Xu/io_uring-zerocopy-receive/20220124-174546 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git dd81e1c7d5fb126e5fbc5c9e334d7b3ec29a16a0 config: s390-buildonly-randconfig-r004-20220124 (https://download.01.org/0day-ci/archive/20220124/202201242233.64QOWQZ1-lkp@intel.com/config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 2e58a18910867ba6795066e044293e6daf89edf5) 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/0day-ci/linux/commit/295704165d394635876364522d3ac1451b62da66 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Hao-Xu/io_uring-zerocopy-receive/20220124-174546 git checkout 295704165d394635876364522d3ac1451b62da66 # 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=s390 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All errors (new ones prefixed by >>): In file included from fs/io_uring.c:60: In file included from include/linux/blk-mq.h:8: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:75: 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/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 fs/io_uring.c:60: In file included from include/linux/blk-mq.h:8: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:75: 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/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 fs/io_uring.c:60: In file included from include/linux/blk-mq.h:8: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:75: 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:609:20: 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:617:20: 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:625:20: 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:634:21: 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:643:21: 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:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ >> fs/io_uring.c:6639:10: error: implicit declaration of function 'io_recvzc_prep' [-Werror,-Wimplicit-function-declaration] return io_recvzc_prep(req, sqe); ^ fs/io_uring.c:6639:10: note: did you mean 'io_recvmsg_prep'? fs/io_uring.c:5462:1: note: 'io_recvmsg_prep' declared here IO_NETOP_PREP_ASYNC(recvmsg); ^ fs/io_uring.c:5454:38: note: expanded from macro 'IO_NETOP_PREP_ASYNC' #define IO_NETOP_PREP_ASYNC(op) \ ^ fs/io_uring.c:5449:12: note: expanded from macro '\ IO_NETOP_PREP' static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \ ^ :22:1: note: expanded from here io_recvmsg_prep ^ >> fs/io_uring.c:6924:9: error: implicit declaration of function 'io_recvzc' [-Werror,-Wimplicit-function-declaration] ret = io_recvzc(req, issue_flags); ^ fs/io_uring.c:6924:9: note: did you mean 'io_recv'? fs/io_uring.c:5466:1: note: 'io_recv' declared here IO_NETOP_FN(recv); ^ fs/io_uring.c:5442:12: note: expanded from macro 'IO_NETOP_FN' static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \ ^ :34:1: note: expanded from here io_recv ^ 12 warnings and 2 errors generated. vim +/io_recvzc_prep +6639 fs/io_uring.c 6560 6561 static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 6562 { 6563 switch (req->opcode) { 6564 case IORING_OP_NOP: 6565 return 0; 6566 case IORING_OP_READV: 6567 case IORING_OP_READ_FIXED: 6568 case IORING_OP_READ: 6569 return io_read_prep(req, sqe); 6570 case IORING_OP_WRITEV: 6571 case IORING_OP_WRITE_FIXED: 6572 case IORING_OP_WRITE: 6573 return io_write_prep(req, sqe); 6574 case IORING_OP_POLL_ADD: 6575 return io_poll_add_prep(req, sqe); 6576 case IORING_OP_POLL_REMOVE: 6577 return io_poll_update_prep(req, sqe); 6578 case IORING_OP_FSYNC: 6579 return io_fsync_prep(req, sqe); 6580 case IORING_OP_SYNC_FILE_RANGE: 6581 return io_sfr_prep(req, sqe); 6582 case IORING_OP_SENDMSG: 6583 case IORING_OP_SEND: 6584 return io_sendmsg_prep(req, sqe); 6585 case IORING_OP_RECVMSG: 6586 case IORING_OP_RECV: 6587 return io_recvmsg_prep(req, sqe); 6588 case IORING_OP_CONNECT: 6589 return io_connect_prep(req, sqe); 6590 case IORING_OP_TIMEOUT: 6591 return io_timeout_prep(req, sqe, false); 6592 case IORING_OP_TIMEOUT_REMOVE: 6593 return io_timeout_remove_prep(req, sqe); 6594 case IORING_OP_ASYNC_CANCEL: 6595 return io_async_cancel_prep(req, sqe); 6596 case IORING_OP_LINK_TIMEOUT: 6597 return io_timeout_prep(req, sqe, true); 6598 case IORING_OP_ACCEPT: 6599 return io_accept_prep(req, sqe); 6600 case IORING_OP_FALLOCATE: 6601 return io_fallocate_prep(req, sqe); 6602 case IORING_OP_OPENAT: 6603 return io_openat_prep(req, sqe); 6604 case IORING_OP_CLOSE: 6605 return io_close_prep(req, sqe); 6606 case IORING_OP_FILES_UPDATE: 6607 return io_rsrc_update_prep(req, sqe); 6608 case IORING_OP_STATX: 6609 return io_statx_prep(req, sqe); 6610 case IORING_OP_FADVISE: 6611 return io_fadvise_prep(req, sqe); 6612 case IORING_OP_MADVISE: 6613 return io_madvise_prep(req, sqe); 6614 case IORING_OP_OPENAT2: 6615 return io_openat2_prep(req, sqe); 6616 case IORING_OP_EPOLL_CTL: 6617 return io_epoll_ctl_prep(req, sqe); 6618 case IORING_OP_SPLICE: 6619 return io_splice_prep(req, sqe); 6620 case IORING_OP_PROVIDE_BUFFERS: 6621 return io_provide_buffers_prep(req, sqe); 6622 case IORING_OP_REMOVE_BUFFERS: 6623 return io_remove_buffers_prep(req, sqe); 6624 case IORING_OP_TEE: 6625 return io_tee_prep(req, sqe); 6626 case IORING_OP_SHUTDOWN: 6627 return io_shutdown_prep(req, sqe); 6628 case IORING_OP_RENAMEAT: 6629 return io_renameat_prep(req, sqe); 6630 case IORING_OP_UNLINKAT: 6631 return io_unlinkat_prep(req, sqe); 6632 case IORING_OP_MKDIRAT: 6633 return io_mkdirat_prep(req, sqe); 6634 case IORING_OP_SYMLINKAT: 6635 return io_symlinkat_prep(req, sqe); 6636 case IORING_OP_LINKAT: 6637 return io_linkat_prep(req, sqe); 6638 case IORING_OP_RECVZC: > 6639 return io_recvzc_prep(req, sqe); 6640 } 6641 6642 printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", 6643 req->opcode); 6644 return -EINVAL; 6645 } 6646 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org