[kbuild-all] drivers/md/dm-cache-metadata.c:1716:2: warning: 'strncpy' specified bound 16 equals destination size

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: fc4f28bb3daf3265d6bc5f73b497306985bb23ab commit: 20d38f7c45a44e4b762b586a7bcacbc93ddb3153 riscv: Allow building with kcov coverage date: 7 weeks ago config: riscv-randconfig-r013-20200916 (attached as .config) compiler: riscv32-linux-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 20d38f7c45a44e4b762b586a7bcacbc93ddb3153 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=riscv 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 >>): In function 'write_hints', inlined from 'dm_cache_write_hints' at drivers/md/dm-cache-metadata.c:1740:6: 1716 | strncpy(cmd->policy_name, policy_name, sizeof(cmd->policy_name)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 20d38f7c45a44e4b762b586a7bcacbc93ddb3153 vim +/strncpy +1716 drivers/md/dm-cache-metadata.c 4e781b498ee500 Joe Thornber 2016-09-15 1700 4e781b498ee500 Joe Thornber 2016-09-15 1701 /* 4e781b498ee500 Joe Thornber 2016-09-15 1702 * It's quicker to always delete the hint array, and recreate with 4e781b498ee500 Joe Thornber 2016-09-15 1703 * dm_array_new(). 4e781b498ee500 Joe Thornber 2016-09-15 1704 */ 4e781b498ee500 Joe Thornber 2016-09-15 1705 static int write_hints(struct dm_cache_metadata *cmd, struct dm_cache_policy *policy) c6b4fcbad044e6 Joe Thornber 2013-03-01 1706 { c6b4fcbad044e6 Joe Thornber 2013-03-01 1707 int r; c6b4fcbad044e6 Joe Thornber 2013-03-01 1708 size_t hint_size; c6b4fcbad044e6 Joe Thornber 2013-03-01 1709 const char *policy_name = dm_cache_policy_get_name(policy); 4e7f506f642963 Mike Snitzer 2013-03-20 1710 const unsigned *policy_version = dm_cache_policy_get_version(policy); c6b4fcbad044e6 Joe Thornber 2013-03-01 1711 c6b4fcbad044e6 Joe Thornber 2013-03-01 1712 if (!policy_name[0] || c6b4fcbad044e6 Joe Thornber 2013-03-01 1713 (strlen(policy_name) > sizeof(cmd->policy_name) - 1)) c6b4fcbad044e6 Joe Thornber 2013-03-01 1714 return -EINVAL; c6b4fcbad044e6 Joe Thornber 2013-03-01 1715 c6b4fcbad044e6 Joe Thornber 2013-03-01 @1716 strncpy(cmd->policy_name, policy_name, sizeof(cmd->policy_name)); 4e7f506f642963 Mike Snitzer 2013-03-20 1717 memcpy(cmd->policy_version, policy_version, sizeof(cmd->policy_version)); c6b4fcbad044e6 Joe Thornber 2013-03-01 1718 c6b4fcbad044e6 Joe Thornber 2013-03-01 1719 hint_size = dm_cache_policy_get_hint_size(policy); c6b4fcbad044e6 Joe Thornber 2013-03-01 1720 if (!hint_size) c6b4fcbad044e6 Joe Thornber 2013-03-01 1721 return 0; /* short-circuit hints initialization */ c6b4fcbad044e6 Joe Thornber 2013-03-01 1722 cmd->policy_hint_size = hint_size; c6b4fcbad044e6 Joe Thornber 2013-03-01 1723 c6b4fcbad044e6 Joe Thornber 2013-03-01 1724 if (cmd->hint_root) { c6b4fcbad044e6 Joe Thornber 2013-03-01 1725 r = dm_array_del(&cmd->hint_info, cmd->hint_root); c6b4fcbad044e6 Joe Thornber 2013-03-01 1726 if (r) c6b4fcbad044e6 Joe Thornber 2013-03-01 1727 return r; c6b4fcbad044e6 Joe Thornber 2013-03-01 1728 } c6b4fcbad044e6 Joe Thornber 2013-03-01 1729 4e781b498ee500 Joe Thornber 2016-09-15 1730 return dm_array_new(&cmd->hint_info, &cmd->hint_root, c6b4fcbad044e6 Joe Thornber 2013-03-01 1731 from_cblock(cmd->cache_blocks), 4e781b498ee500 Joe Thornber 2016-09-15 1732 get_hint, policy); 0596661f0a16d9 Joe Thornber 2014-04-03 1733 } 0596661f0a16d9 Joe Thornber 2014-04-03 1734 :::::: The code at line 1716 was first introduced by commit :::::: c6b4fcbad044e6fffcc75bba160e720eb8d67d17 dm: add cache target :::::: TO: Joe Thornber <ejt(a)redhat.com&gt; :::::: CC: Alasdair G Kergon <agk(a)redhat.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org