Hi Shunsuke,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on v5.14]
[cannot apply to rdma/for-next next-20210908]
[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/Shunsuke-Mie/RDMA-rxe-Add-dma-buf-support/20210908-142001
base:    7d2a07b769330c34b4deabeed939325c77a7ec2f
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-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://github.com/0day-ci/linux/commit/80fcf7f4bc573f6f833baeb7e390e44a79ddd84f
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Shunsuke-Mie/RDMA-rxe-Add-dma-buf-support/20210908-142001
        git checkout 80fcf7f4bc573f6f833baeb7e390e44a79ddd84f
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=ia64 SHELL=/bin/bash drivers/infiniband/sw/rxe/

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

All errors (new ones prefixed by >>):

   drivers/infiniband/sw/rxe/rxe_mr.c: In function 'rxe_mr_dmabuf_init_user':
>> drivers/infiniband/sw/rxe/rxe_mr.c:304:14: error: 'i' undeclared (first use in this function)
     304 |         for (i = 0; i < mr->num_map; i++)
         |              ^
   drivers/infiniband/sw/rxe/rxe_mr.c:304:14: note: each undeclared identifier is reported only once for each function it appears in


vim +/i +304 drivers/infiniband/sw/rxe/rxe_mr.c

   254	
   255	/* initialize a umem and map all the areas of dma-buf. */
   256	int rxe_mr_dmabuf_init_user(struct rxe_pd *pd, int fd, u64 start, u64 length,
   257				    u64 iova, int access, struct rxe_mr *mr)
   258	{
   259		struct ib_umem_dmabuf *umem_dmabuf;
   260		int num_buf;
   261		int err;
   262	
   263		umem_dmabuf = ib_umem_dmabuf_get(pd->ibpd.device, start, length, fd,
   264						 access, &rxe_ib_dmabuf_attach_ops);
   265		if (IS_ERR(umem_dmabuf)) {
   266			err = PTR_ERR(umem_dmabuf);
   267			pr_err("%s: failed to get umem_dmabuf (%d)", __func__, err);
   268			goto err1;
   269		}
   270	
   271		umem_dmabuf->private = mr;
   272	
   273		mr->umem = &umem_dmabuf->umem;
   274		mr->umem->iova = iova;
   275		num_buf = ib_umem_num_pages(mr->umem);
   276	
   277		rxe_mr_init(access, mr);
   278	
   279		err = rxe_mr_alloc(mr, num_buf);
   280		if (err)
   281			goto err1;
   282	
   283		mr->page_shift = PAGE_SHIFT;
   284		mr->page_mask = PAGE_SIZE - 1;
   285	
   286		mr->ibmr.pd = &pd->ibpd;
   287		mr->access = access;
   288		mr->length = length;
   289		mr->iova = iova;
   290		mr->va = start;
   291		mr->offset = ib_umem_offset(mr->umem);
   292		mr->state = RXE_MR_STATE_VALID;
   293		mr->type = RXE_MR_TYPE_MR;
   294	
   295		err = rxe_map_dmabuf_mr(mr);
   296		if (err) {
   297			pr_err("%s: failed to map the dma-buf region", __func__);
   298			goto err2;
   299		}
   300	
   301		return 0;
   302	
   303	err2:
 > 304		for (i = 0; i < mr->num_map; i++)
   305			kfree(mr->map[i]);
   306		kfree(mr->map);
   307	err1:
   308		return err;
   309	}
   310	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org