linux-kernel - [mcgrof-next:20220311-io-uring-cmd 16/17] fs/io_uring.c:4215:31: warning: cast to pointer from integer of different size

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Date:   Sat, 12 Mar 2022 05:24:57 +0800
From:   kernel test robot <lkp@...el.com>
To:     Kanchan Joshi <joshi.k@...sung.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Luis Chamberlain <mcgrof@...nel.org>,
        Anuj Gupta <anuj20.g@...sung.com>
Subject: [mcgrof-next:20220311-io-uring-cmd 16/17] fs/io_uring.c:4215:31:
 warning: cast to pointer from integer of different size

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git 20220311-io-uring-cmd
head:   abe791464a630c1cc3821258e002a0a623dc9b5a
commit: d7b1a5fd9fdbe454f93795f46e040951a4510d2e [16/17] io_uring: add support for non-inline uring-cmd
config: arm-buildonly-randconfig-r006-20220310 (https://download.01.org/0day-ci/archive/20220312/202203120559.66PKUxNh-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0
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://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git/commit/?id=d7b1a5fd9fdbe454f93795f46e040951a4510d2e
        git remote add mcgrof-next https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git
        git fetch --no-tags mcgrof-next 20220311-io-uring-cmd
        git checkout d7b1a5fd9fdbe454f93795f46e040951a4510d2e
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arm SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   fs/io_uring.c: In function '__io_submit_flush_completions':
   fs/io_uring.c:2562:40: warning: variable 'prev' set but not used [-Wunused-but-set-variable]
    2562 |         struct io_wq_work_node *node, *prev;
         |                                        ^~~~
   fs/io_uring.c: In function 'io_uring_cmd_prep':
>> fs/io_uring.c:4215:31: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
    4215 |                 ioucmd->cmd = (void *) sqe->cmd;
         |                               ^


vim +4215 fs/io_uring.c

  4186	
  4187	static int io_uring_cmd_prep(struct io_kiocb *req,
  4188				     const struct io_uring_sqe *sqe)
  4189	{
  4190		struct io_ring_ctx *ctx = req->ctx;
  4191		struct io_uring_cmd *ioucmd = &req->uring_cmd;
  4192		u32 ucmd_flags = READ_ONCE(sqe->uring_cmd_flags);
  4193	
  4194		if (!req->file->f_op->async_cmd)
  4195			return -EOPNOTSUPP;
  4196		if (!(req->ctx->flags & IORING_SETUP_SQE128) &&
  4197				!(ucmd_flags & IORING_URING_CMD_INDIRECT))
  4198			return -EOPNOTSUPP;
  4199		if (req->ctx->flags & IORING_SETUP_IOPOLL) {
  4200			ioucmd->flags = IO_URING_F_UCMD_POLLED;
  4201			ioucmd->bio = NULL;
  4202			req->iopoll_completed = 0;
  4203		} else {
  4204			ioucmd->flags = 0;
  4205		}
  4206		if (req->opcode == IORING_OP_URING_CMD_FIXED) {
  4207			req->imu = NULL;
  4208			io_req_set_rsrc_node(req, ctx);
  4209			req->buf_index = READ_ONCE(sqe->buf_index);
  4210			ioucmd->flags |= IO_URING_F_UCMD_FIXEDBUFS;
  4211		}
  4212	
  4213		if (ucmd_flags & IORING_URING_CMD_INDIRECT) {
  4214			ioucmd->flags |= IO_URING_F_UCMD_INDIRECT;
> 4215			ioucmd->cmd = (void *) sqe->cmd;
  4216		} else {
  4217			ioucmd->cmd = (void *) &sqe->cmd;
  4218		}
  4219		ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);
  4220		ioucmd->cmd_len = READ_ONCE(sqe->cmd_len);
  4221		return 0;
  4222	}
  4223	

---
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