Hi Shunsuke,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on rdma/for-next]
[also build test ERROR on v5.15 next-20211111]
[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/20211029-150351
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git for-next
config: s390-allyesconfig (attached as .config)
compiler: s390-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/132b40bb2550f801c5e94fcde19f28b29b0852e2
        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/20211029-150351
        git checkout 132b40bb2550f801c5e94fcde19f28b29b0852e2
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=s390 

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_map_dmabuf_mr':
>> drivers/infiniband/sw/rxe/rxe_mr.c:256:23: error: variable 'vaddr_end' set but not used [-Werror=unused-but-set-variable]
     256 |         void *vaddr, *vaddr_end;
         |                       ^~~~~~~~~
   cc1: all warnings being treated as errors


vim +/vaddr_end +256 drivers/infiniband/sw/rxe/rxe_mr.c

   249	
   250	static int rxe_map_dmabuf_mr(struct rxe_mr *mr,
   251				     struct ib_umem_dmabuf *umem_dmabuf)
   252	{
   253		struct rxe_map_set *set;
   254		struct rxe_phys_buf *buf = NULL;
   255		struct rxe_map **map;
 > 256		void *vaddr, *vaddr_end;
   257		int num_buf = 0;
   258		int err;
   259		size_t remain;
   260		struct dma_buf_map dmabuf_map;
   261	
   262		err = dma_buf_vmap(umem_dmabuf->dmabuf, &dmabuf_map);
   263		if (err || dmabuf_map.is_iomem)
   264			goto err_out;
   265	
   266		set = mr->cur_map_set;
   267		set->page_shift = PAGE_SHIFT;
   268		set->page_mask = PAGE_SIZE - 1;
   269	
   270		map = set->map;
   271		buf = map[0]->buf;
   272	
   273		vaddr = dmabuf_map.vaddr;
   274		vaddr_end = vaddr + umem_dmabuf->dmabuf->size;
   275		remain = umem_dmabuf->dmabuf->size;
   276	
   277		for (; remain; vaddr += PAGE_SIZE) {
   278			if (num_buf >= RXE_BUF_PER_MAP) {
   279				map++;
   280				buf = map[0]->buf;
   281				num_buf = 0;
   282			}
   283	
   284			buf->addr = (uintptr_t)vaddr;
   285			if (remain >= PAGE_SIZE)
   286				buf->size = PAGE_SIZE;
   287			else
   288				buf->size = remain;
   289			remain -= buf->size;
   290	
   291			num_buf++;
   292			buf++;
   293		}
   294	
   295		return 0;
   296	
   297	err_out:
   298		return err;
   299	}
   300	

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