Re: [PATCH V2 05/17] io_uring: support OP_SEND_ZC/OP_RECV for fused slave request

[kernel test robot <lkp@intel.com>]

Hi Ming,

I love your patch! Perhaps something to improve:

[auto build test WARNING on axboe-block/for-next]
[also build test WARNING on linus/master v6.3-rc1 next-20230309]
[cannot apply to char-misc/char-misc-testing char-misc/char-misc-next char-misc/char-misc-linus]
[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/Ming-Lei/io_uring-add-IO_URING_F_FUSED-and-prepare-for-supporting-OP_FUSED_CMD/20230307-222928
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
patch link:    https://lore.kernel.org/r/20230307141520.793891-6-ming.lei%40redhat.com
patch subject: [PATCH V2 05/17] io_uring: support OP_SEND_ZC/OP_RECV for fused slave request
config: sparc64-randconfig-s031-20230308 (https://download.01.org/0day-ci/archive/20230310/202303100159.i9Bzx24n-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/intel-lab-lkp/linux/commit/0a921da27026b3ba08aeceb432dd983480281344
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Ming-Lei/io_uring-add-IO_URING_F_FUSED-and-prepare-for-supporting-OP_FUSED_CMD/20230307-222928
        git checkout 0a921da27026b3ba08aeceb432dd983480281344
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303100159.i9Bzx24n-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   io_uring/net.c: note: in included file (through io_uring/io_uring.h):
   io_uring/slist.h:116:29: sparse: sparse: no newline at end of file
   io_uring/net.c: note: in included file (through io_uring/io_uring.h):
   include/linux/io_uring_types.h:179:37: sparse: sparse: array of flexible structures
>> io_uring/net.c:385:49: sparse: sparse: cast removes address space '__user' of expression
   io_uring/net.c:880:49: sparse: sparse: cast removes address space '__user' of expression
   io_uring/net.c:1135:49: sparse: sparse: cast removes address space '__user' of expression

vim +/__user +385 io_uring/net.c

   343	
   344	int io_send(struct io_kiocb *req, unsigned int issue_flags)
   345	{
   346		struct sockaddr_storage __address;
   347		struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
   348		struct msghdr msg;
   349		struct socket *sock;
   350		unsigned flags;
   351		int min_ret = 0;
   352		int ret;
   353	
   354		msg.msg_name = NULL;
   355		msg.msg_control = NULL;
   356		msg.msg_controllen = 0;
   357		msg.msg_namelen = 0;
   358		msg.msg_ubuf = NULL;
   359	
   360		if (sr->addr) {
   361			if (req_has_async_data(req)) {
   362				struct io_async_msghdr *io = req->async_data;
   363	
   364				msg.msg_name = &io->addr;
   365			} else {
   366				ret = move_addr_to_kernel(sr->addr, sr->addr_len, &__address);
   367				if (unlikely(ret < 0))
   368					return ret;
   369				msg.msg_name = (struct sockaddr *)&__address;
   370			}
   371			msg.msg_namelen = sr->addr_len;
   372		}
   373	
   374		if (!(req->flags & REQ_F_POLLED) &&
   375		    (sr->flags & IORING_RECVSEND_POLL_FIRST))
   376			return io_setup_async_addr(req, &__address, issue_flags);
   377	
   378		sock = sock_from_file(req->file);
   379		if (unlikely(!sock))
   380			return -ENOTSOCK;
   381	
   382		if (!(req->flags & REQ_F_FUSED_SLAVE))
   383			ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len, &msg.msg_iter);
   384		else
 > 385			ret = io_import_kbuf_for_slave((u64)sr->buf, sr->len,
   386					ITER_SOURCE, &msg.msg_iter, req);
   387		if (unlikely(ret))
   388			return ret;
   389	
   390		flags = sr->msg_flags;
   391		if (issue_flags & IO_URING_F_NONBLOCK)
   392			flags |= MSG_DONTWAIT;
   393		if (flags & MSG_WAITALL)
   394			min_ret = iov_iter_count(&msg.msg_iter);
   395	
   396		msg.msg_flags = flags;
   397		ret = sock_sendmsg(sock, &msg);
   398		if (ret < min_ret) {
   399			if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
   400				return io_setup_async_addr(req, &__address, issue_flags);
   401	
   402			if (ret > 0 && io_net_retry(sock, flags)) {
   403				sr->len -= ret;
   404				sr->buf += ret;
   405				sr->done_io += ret;
   406				req->flags |= REQ_F_PARTIAL_IO;
   407				return io_setup_async_addr(req, &__address, issue_flags);
   408			}
   409			if (ret == -ERESTARTSYS)
   410				ret = -EINTR;
   411			req_set_fail(req);
   412		}
   413		if (ret >= 0)
   414			ret += sr->done_io;
   415		else if (sr->done_io)
   416			ret = sr->done_io;
   417		io_req_set_res(req, ret, 0);
   418		return IOU_OK;
   419	}
   420	

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