tree: https://github.com/ceph/ceph-client.git wip-object-map head: b949866d3d5288f94ec8e129af2e8d44c9b270df commit: db0a28e0a21f4432421b27c6ecd5d2368a4435ee [19/21] rbd: support for object-map and fast-diff config: i386-randconfig-n004-201925 (attached as .config) compiler: gcc-7 (Debian 7.4.0-9) 7.4.0 reproduce: git checkout db0a28e0a21f4432421b27c6ecd5d2368a4435ee # save the attached .config to linux build tree make ARCH=i386 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): drivers/block/rbd.c: In function 'rbd_object_map_callback': >> drivers/block/rbd.c:2125:21: warning: 'current_state' may be used uninitialized in this function [-Wmaybe-uninitialized] (current_state == OBJECT_EXISTS && state == OBJECT_EXISTS_CLEAN)) drivers/block/rbd.c:2093:23: note: 'current_state' was declared here u8 state, new_state, current_state; ^~~~~~~~~~~~~ vim +/current_state +2125 drivers/block/rbd.c 2076 2077 /* 2078 * This function needs snap_id (or more precisely just something to 2079 * distinguish between HEAD and snapshot object maps), new_state and 2080 * current_state that were passed to rbd_object_map_update(). 2081 * 2082 * To avoid allocating and stashing a context we piggyback on the OSD 2083 * request. A HEAD update has two ops (assert_locked). For new_state 2084 * and current_state we decode our own object_map_update op, encoded in 2085 * rbd_cls_object_map_update(). 2086 */ 2087 static int rbd_object_map_update_finish(struct rbd_obj_request *obj_req, 2088 struct ceph_osd_request *osd_req) 2089 { 2090 struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; 2091 struct ceph_osd_data *osd_data; 2092 u64 objno; 2093 u8 state, new_state, current_state; 2094 bool has_current_state; 2095 void *p; 2096 2097 if (osd_req->r_result) 2098 return osd_req->r_result; 2099 2100 /* 2101 * Nothing to do for a snapshot object map. 2102 */ 2103 if (osd_req->r_num_ops == 1) 2104 return 0; 2105 2106 /* 2107 * Update in-memory HEAD object map. 2108 */ 2109 rbd_assert(osd_req->r_num_ops == 2); 2110 osd_data = osd_req_op_data(osd_req, 1, cls, request_data); 2111 rbd_assert(osd_data->type == CEPH_OSD_DATA_TYPE_PAGES); 2112 2113 p = page_address(osd_data->pages[0]); 2114 objno = ceph_decode_64(&p); 2115 rbd_assert(objno == obj_req->ex.oe_objno); 2116 rbd_assert(ceph_decode_64(&p) == objno + 1); 2117 new_state = ceph_decode_8(&p); 2118 has_current_state = ceph_decode_8(&p); 2119 if (has_current_state) 2120 current_state = ceph_decode_8(&p); 2121 2122 spin_lock(&rbd_dev->object_map_lock); 2123 state = __rbd_object_map_get(rbd_dev, objno); 2124 if (!has_current_state || current_state == state || > 2125 (current_state == OBJECT_EXISTS && state == OBJECT_EXISTS_CLEAN)) 2126 __rbd_object_map_set(rbd_dev, objno, new_state); 2127 spin_unlock(&rbd_dev->object_map_lock); 2128 2129 return 0; 2130 } 2131 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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