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: i386-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=i386 All warnings (new ones prefixed by >>): drivers/md/dm-table.c: In function 'dm_table_set_restrictions': >> drivers/md/dm-table.c:1772:11: warning: 'i' is used uninitialized in this function [-Wuninitialized] unsigned i; ^ vim +/i +1772 drivers/md/dm-table.c a7ffb6a5 Mikulas Patocka 2014-07-10 1768 a7ffb6a5 Mikulas Patocka 2014-07-10 1769 static bool dm_table_supports_discards(struct dm_table *t) a7ffb6a5 Mikulas Patocka 2014-07-10 1770 { a7ffb6a5 Mikulas Patocka 2014-07-10 1771 struct dm_target *ti; 3c120169 Mikulas Patocka 2017-04-18 @1772 unsigned i; a7ffb6a5 Mikulas Patocka 2014-07-10 1773 21846377 Mike Snitzer 2017-11-14 1774 while (i < dm_table_get_num_targets(t)) { 21846377 Mike Snitzer 2017-11-14 1775 ti = dm_table_get_target(t, i++); a7ffb6a5 Mikulas Patocka 2014-07-10 1776 a7ffb6a5 Mikulas Patocka 2014-07-10 1777 if (!ti->num_discard_bios) 21846377 Mike Snitzer 2017-11-14 1778 return false; a7ffb6a5 Mikulas Patocka 2014-07-10 1779 21846377 Mike Snitzer 2017-11-14 1780 /* 21846377 Mike Snitzer 2017-11-14 1781 * Either the target provides discard support (as implied by setting 21846377 Mike Snitzer 2017-11-14 1782 * 'discards_supported') or it relies on _all_ data devices having 21846377 Mike Snitzer 2017-11-14 1783 * discard support. 21846377 Mike Snitzer 2017-11-14 1784 */ 21846377 Mike Snitzer 2017-11-14 1785 if (!ti->discards_supported && 21846377 Mike Snitzer 2017-11-14 1786 (!ti->type->iterate_devices || 21846377 Mike Snitzer 2017-11-14 1787 ti->type->iterate_devices(ti, device_not_discard_capable, NULL))) 21846377 Mike Snitzer 2017-11-14 1788 return false; a7ffb6a5 Mikulas Patocka 2014-07-10 1789 } a7ffb6a5 Mikulas Patocka 2014-07-10 1790 21846377 Mike Snitzer 2017-11-14 1791 return true; a7ffb6a5 Mikulas Patocka 2014-07-10 1792 } a7ffb6a5 Mikulas Patocka 2014-07-10 1793 :::::: The code at line 1772 was first introduced by commit :::::: 3c12016910061c2a19d985fba7f7dec19d6a3a09 dm table: replace while loops with for loops :::::: TO: Mikulas Patocka <mpatocka@xxxxxxxxxx> :::::: CC: Mike Snitzer <snitzer@xxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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