tree: https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git ceph-fscache-iter head: dd30af9185f80cb37a460728ceea2c26464176b5 commit: dd30af9185f80cb37a460728ceea2c26464176b5 [13/13] ceph: add new allocator for combined fsc/osd request config: x86_64-allyesconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 3393cc4cebf9969db94dc424b7a2b6195589c33b) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git checkout dd30af9185f80cb37a460728ceea2c26464176b5 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): req->r_free = free_fsc_req; ^~~ fs/ceph/util.c:252:31: note: initialize the variable 'req' to silence this warning struct ceph_osd_request *req; ^ = NULL 1 warning generated. vim +/req +258 fs/ceph/util.c 235 236 /* 237 * Allocate an OSD request with an embedded fscache request. 238 */ 239 struct ceph_fsc_request *ceph_fsc_new_request(struct ceph_osd_client *osdc, 240 struct ceph_file_layout *layout, 241 struct ceph_vino vino, 242 u64 off, u64 *plen, 243 unsigned int which, int num_ops, 244 int opcode, int flags, 245 struct ceph_snap_context *snapc, 246 u32 truncate_seq, 247 u64 truncate_size, 248 bool use_mempool) 249 { 250 int ret; 251 struct ceph_fsc_request *fscreq; 252 struct ceph_osd_request *req; 253 254 fscreq = kzalloc(struct_size(fscreq, osd_req.r_ops, num_ops), GFP_NOFS); 255 if (!fscreq) 256 return ERR_PTR(-ENOMEM); 257 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org