[kbusch:dma-prereg-v3-wip 5/6] io_uring/rsrc.c:155: undefined reference to `io_dma_unmap'

[kbusch:dma-prereg-v3-wip 5/6] io_uring/rsrc.c:155: undefined reference to `io_dma_unmap'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kbusch/linux.git dma-prereg-v3-wip
head:   4625fa7adf745334c0a2eb635121d587df797b29
commit: 1390adeaee356151aeb13383e6ee1ad1c5798816 [5/6] io_uring: add support for dma pre-mapping
config: x86_64-randconfig-m001 (https://download.01.org/0day-ci/archive/20220722/202207221539.1JrGZRYG-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/kbusch/linux.git/commit/?id=1390adeaee356151aeb13383e6ee1ad1c5798816
        git remote add kbusch https://git.kernel.org/pub/scm/linux/kernel/git/kbusch/linux.git
        git fetch --no-tags kbusch dma-prereg-v3-wip
        git checkout 1390adeaee356151aeb13383e6ee1ad1c5798816
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   ld: io_uring/rsrc.o: in function `io_buffer_unmap':
>> io_uring/rsrc.c:155: undefined reference to `io_dma_unmap'


vim +155 io_uring/rsrc.c

   144	
   145	static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot)
   146	{
   147		struct io_mapped_ubuf *imu = *slot;
   148		unsigned int i;
   149	
   150		if (imu != ctx->dummy_ubuf) {
   151			for (i = 0; i < imu->nr_bvecs; i++)
   152				unpin_user_page(imu->bvec[i].bv_page);
   153			if (imu->acct_pages)
   154				io_unaccount_mem(ctx, imu->acct_pages);
 > 155			io_dma_unmap(imu);
   156			kvfree(imu);
   157		}
   158		*slot = NULL;
   159	}
   160	

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