tree: https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git branches/for-4.15/dm head: 6a768a2a8fd04fa89cfad1385d15601ff22adaff commit: 21846377c4fd5d3ccfcf0dc68f0a4866c0c49803 [26/27] dm: discard support requires all targets in a table support discards config: x86_64-randconfig-x001-201746 (attached as .config) compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026 reproduce: git checkout 21846377c4fd5d3ccfcf0dc68f0a4866c0c49803 # save the attached .config to linux build tree make ARCH=x86_64 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//md/dm-table.c: In function 'dm_table_set_restrictions': >> drivers//md/dm-table.c:1775:8: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized] ti = dm_table_get_target(t, i++); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers//md/dm-table.c:1772:11: note: 'i' was declared here unsigned i; ^ vim +/i +1775 drivers//md/dm-table.c 1768 1769 static bool dm_table_supports_discards(struct dm_table *t) 1770 { 1771 struct dm_target *ti; 1772 unsigned i; 1773 1774 while (i < dm_table_get_num_targets(t)) { > 1775 ti = dm_table_get_target(t, i++); 1776 1777 if (!ti->num_discard_bios) 1778 return false; 1779 1780 /* 1781 * Either the target provides discard support (as implied by setting 1782 * 'discards_supported') or it relies on _all_ data devices having 1783 * discard support. 1784 */ 1785 if (!ti->discards_supported && 1786 (!ti->type->iterate_devices || 1787 ti->type->iterate_devices(ti, device_not_discard_capable, NULL))) 1788 return false; 1789 } 1790 1791 return true; 1792 } 1793 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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