[axboe-block:for-5.19/io_uring-passthrough 90/91] drivers/nvme/host/multipath.c:440:27: error: initialization of 'int (*)(struct io_uring_cmd *, unsigned int)' from incompatible pointer type 'void (*)(struct io_uring_cmd *, unsigned int)'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-5.19/io_uring-passthrough
head:   5216380430fe99277e745867b6d9232e09dd1a21
commit: cedc754a8590e5531ec9e85a44e6fe1e296d10c4 [90/91] nvme: wire-up uring-cmd support for io-passthru on char-device.
config: i386-debian-10.3 (https://download.01.org/0day-ci/archive/20220506/202205060818.JVCJuprZ-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.2.0-20) 11.2.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/commit/?id=cedc754a8590e5531ec9e85a44e6fe1e296d10c4
        git remote add axboe-block https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git
        git fetch --no-tags axboe-block for-5.19/io_uring-passthrough
        git checkout cedc754a8590e5531ec9e85a44e6fe1e296d10c4
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/nvme/host/

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

All errors (new ones prefixed by >>):

>> drivers/nvme/host/multipath.c:440:27: error: initialization of 'int (*)(struct io_uring_cmd *, unsigned int)' from incompatible pointer type 'void (*)(struct io_uring_cmd *, unsigned int)' [-Werror=incompatible-pointer-types]
     440 |         .uring_cmd      = nvme_ns_head_chr_uring_cmd,
         |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/nvme/host/multipath.c:440:27: note: (near initialization for 'nvme_ns_head_chr_fops.uring_cmd')
   cc1: some warnings being treated as errors


vim +440 drivers/nvme/host/multipath.c

   433	
   434	static const struct file_operations nvme_ns_head_chr_fops = {
   435		.owner		= THIS_MODULE,
   436		.open		= nvme_ns_head_chr_open,
   437		.release	= nvme_ns_head_chr_release,
   438		.unlocked_ioctl	= nvme_ns_head_chr_ioctl,
   439		.compat_ioctl	= compat_ptr_ioctl,
 > 440		.uring_cmd	= nvme_ns_head_chr_uring_cmd,
   441	};
   442	

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