tree:   https://github.com/ammarfaizi2/linux-block dhowells/linux-fs/cifs-for-viro
head:   df803766d7a8e3e9214c3efd185bf31a1d8fcd46
commit: ff68c55b665d0fa71aad17350b20049383776139 [6/12] cifs: Add a function to build an RDMA SGE list from an iterator
config: arm64-allyesconfig
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 463da45892e2d2a262277b91b96f5f8c05dc25d0)
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
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/ammarfaizi2/linux-block/commit/ff68c55b665d0fa71aad17350b20049383776139
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block dhowells/linux-fs/cifs-for-viro
        git checkout ff68c55b665d0fa71aad17350b20049383776139
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/iio/frequency/ fs/cifs/

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

All warnings (new ones prefixed by >>):

>> fs/cifs/smbdirect.c:2655:3: warning: variable 'ret' is uninitialized when used here [-Wuninitialized]
                   ret += len;
                   ^~~
   fs/cifs/smbdirect.c:2631:13: note: initialize the variable 'ret' to silence this warning
           ssize_t ret;
                      ^
                       = 0
   fs/cifs/smbdirect.c:2675:16: warning: unused function 'smb_extract_iter_to_rdma' [-Wunused-function]
   static ssize_t smb_extract_iter_to_rdma(struct iov_iter *iter, size_t len,
                  ^
   2 warnings generated.


vim +/ret +2655 fs/cifs/smbdirect.c

  2617	
  2618	/*
  2619	 * Extract folio fragments from an XARRAY-class iterator and add them to an
  2620	 * RDMA list.  The folios are not pinned.
  2621	 */
  2622	static ssize_t smb_extract_xarray_to_rdma(struct iov_iter *iter,
  2623						  struct smb_extract_to_rdma *rdma,
  2624						  ssize_t maxsize)
  2625	{
  2626		struct xarray *xa = iter->xarray;
  2627		struct folio *folio;
  2628		unsigned int sge_max = rdma->max_sge;
  2629		loff_t start = iter->xarray_start + iter->iov_offset;
  2630		pgoff_t index = start / PAGE_SIZE;
  2631		ssize_t ret;
  2632		size_t off, len;
  2633		XA_STATE(xas, xa, index);
  2634	
  2635		rcu_read_lock();
  2636	
  2637		xas_for_each(&xas, folio, ULONG_MAX) {
  2638			if (xas_retry(&xas, folio))
  2639				continue;
  2640			if (WARN_ON(xa_is_value(folio)))
  2641				break;
  2642			if (WARN_ON(folio_test_hugetlb(folio)))
  2643				break;
  2644	
  2645			off = offset_in_folio(folio, start);
  2646			len = min_t(size_t, maxsize, folio_size(folio) - off);
  2647	
  2648			if (!smb_set_sge(rdma, folio_page(folio, 0), off, len)) {
  2649				rcu_read_lock();
  2650				return -EIO;
  2651			}
  2652			sge_max--;
  2653	
  2654			maxsize -= len;
> 2655			ret += len;
  2656			if (maxsize <= 0 || sge_max == 0)
  2657				break;
  2658		}
  2659	
  2660		rcu_read_unlock();
  2661		return ret;
  2662	}
  2663	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp