tree: https://github.com/ceph/ceph-client.git testing head: a274f50dee76e2182580cafeb908d95bda2cac70 commit: c3e9a9f0a4b9178a5c4068b73d6579e8346cd3f3 [2/3] libceph: switch to the new "osd blocklist add" command config: arm-randconfig-r012-20200916 (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0 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 git checkout c3e9a9f0a4b9178a5c4068b73d6579e8346cd3f3 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): net/ceph/mon_client.c: In function 'do_mon_command_vargs': >> net/ceph/mon_client.c:928:2: warning: function 'do_mon_command_vargs' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 928 | len = vsprintf(h->str, fmt, ap); | ^~~ # https://github.com/ceph/ceph-client/commit/c3e9a9f0a4b9178a5c4068b73d6579... git remote add ceph-client https://github.com/ceph/ceph-client.git git fetch --no-tags ceph-client testing git checkout c3e9a9f0a4b9178a5c4068b73d6579e8346cd3f3 vim +928 net/ceph/mon_client.c 898 899 static int do_mon_command_vargs(struct ceph_mon_client *monc, 900 const char *fmt, va_list ap) 901 { 902 struct ceph_mon_generic_request *req; 903 struct ceph_mon_command *h; 904 int ret = -ENOMEM; 905 int len; 906 907 req = alloc_generic_request(monc, GFP_NOIO); 908 if (!req) 909 goto out; 910 911 req->request = ceph_msg_new(CEPH_MSG_MON_COMMAND, 256, GFP_NOIO, true); 912 if (!req->request) 913 goto out; 914 915 req->reply = ceph_msg_new(CEPH_MSG_MON_COMMAND_ACK, 512, GFP_NOIO, 916 true); 917 if (!req->reply) 918 goto out; 919 920 mutex_lock(&monc->mutex); 921 register_generic_request(req); 922 h = req->request->front.iov_base; 923 h->monhdr.have_version = 0; 924 h->monhdr.session_mon = cpu_to_le16(-1); 925 h->monhdr.session_mon_tid = 0; 926 h->fsid = monc->monmap->fsid; 927 h->num_strs = cpu_to_le32(1); > 928 len = vsprintf(h->str, fmt, ap); 929 h->str_len = cpu_to_le32(len); 930 send_generic_request(monc, req); 931 mutex_unlock(&monc->mutex); 932 933 ret = wait_generic_request(req); 934 out: 935 put_generic_request(req); 936 return ret; 937 } 938 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org