Hi Zhi, [auto build test ERROR on drm-intel/for-linux-next] [also build test ERROR on next-20170913] [cannot apply to v4.13] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Zhi-Wang/drm-i915-Factor-out-setup_private_pat/20170912-152713 base: git://anongit.freedesktop.org/drm-intel for-linux-next config: x86_64-randconfig-a0-09140023 (attached as .config) compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7 reproduce: # 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 errors (new ones prefixed by >>): cc1: warnings being treated as errors drivers/gpu/drm/i915/i915_gem_gtt.c: In function 'intel_ppat_get': drivers/gpu/drm/i915/i915_gem_gtt.c:2791: error: 'entry' may be used uninitialized in this function In file included from drivers/gpu/drm/i915/i915_gem_gtt.c:3767: drivers/gpu/drm/i915/selftests/i915_gem_gtt.c: In function 'igt_ppat_get': >> drivers/gpu/drm/i915/selftests/i915_gem_gtt.c:1365: error: 'entry' may be used uninitialized in this function drivers/gpu/drm/i915/i915_gem_gtt.c: In function 'gen8_ppgtt_insert_4lvl': drivers/gpu/drm/i915/i915_gem_gtt.c:938: error: 'iter.sg' is used uninitialized in this function drivers/gpu/drm/i915/i915_gem_gtt.c:939: error: 'iter.dma' is used uninitialized in this function drivers/gpu/drm/i915/i915_gem_gtt.c: In function 'gen8_ppgtt_insert_3lvl': drivers/gpu/drm/i915/i915_gem_gtt.c:921: error: 'iter.sg' is used uninitialized in this function drivers/gpu/drm/i915/i915_gem_gtt.c:922: error: 'iter.dma' is used uninitialized in this function vim +/entry +1365 drivers/gpu/drm/i915/selftests/i915_gem_gtt.c 1359 1360 static int igt_ppat_get(void *arg) 1361 { 1362 struct drm_i915_private *i915 = arg; 1363 struct intel_ppat *ppat = &i915->ppat; 1364 const struct intel_ppat_entry **entries, **p; > 1365 const struct intel_ppat_entry *entry; 1366 unsigned int size = 0; 1367 int i, ret; 1368 1369 if (!ppat->max_entries) 1370 return 0; 1371 1372 ret = igt_ppat_check(i915); 1373 if (ret) 1374 return ret; 1375 1376 /* case 1: perfect match */ 1377 ret = perform_perfect_match_test(ppat); 1378 if (ret) { 1379 pr_err("fail on perfect match test\n"); 1380 return ret; 1381 } 1382 1383 /* case 2: alloc new entries */ 1384 entries = NULL; 1385 ret = 0; 1386 1387 while (!bitmap_full(ppat->used, ppat->max_entries)) { 1388 p = krealloc(entries, (size + 1) * 1389 sizeof(struct intel_ppat_entry *), 1390 GFP_KERNEL); 1391 if (!p) { 1392 ret = -ENOMEM; 1393 goto ppat_put; 1394 } 1395 1396 entries = p; 1397 1398 p = &entries[size++]; 1399 *p = NULL; 1400 1401 entry = generate_and_check_new_value(ppat); 1402 if (IS_ERR(entry)) { 1403 ret = PTR_ERR(entry); 1404 pr_err("fail on alloc new entries test\n"); 1405 goto ppat_put; 1406 } 1407 *p = entry; 1408 } 1409 1410 /* case 3: negative test 1, suppose PPAT table is full now */ 1411 ret = perform_negative_test(ppat); 1412 if (ret) { 1413 pr_err("fail on negative test 1\n"); 1414 goto ppat_put; 1415 } 1416 1417 /* case 4: partial match */ 1418 ret = perform_partial_match_test(ppat); 1419 if (ret) { 1420 pr_err("fail on partial match test\n"); 1421 goto ppat_put; 1422 } 1423 1424 /* case 3: negative test 2, suppose PPAT table is still full now */ 1425 ret = perform_negative_test(ppat); 1426 if (ret) { 1427 pr_err("fail on negative test 2\n"); 1428 goto ppat_put; 1429 } 1430 1431 /* case 5: re-alloc test, make a hole and it should work again */ 1432 if (entries) { 1433 for(i = 0; i < size; i++) { 1434 entry = entries[i]; 1435 1436 ret = put_and_check_entry(entry); 1437 entries[i] = NULL; 1438 if (ret) { 1439 pr_err("fail on re-alloc test\n"); 1440 goto ppat_put; 1441 } 1442 1443 entry = generate_and_check_new_value(ppat); 1444 if (IS_ERR(entry)) { 1445 ret = PTR_ERR(entry); 1446 pr_err("fail on re-alloc test\n"); 1447 goto ppat_put; 1448 } 1449 entries[i] = entry; 1450 } 1451 } 1452 1453 ppat_put: 1454 if (entries) { 1455 for (i = 0; i < size; i++) { 1456 if (IS_ERR(entries[i]) || !entries[i]) 1457 continue; 1458 1459 if (ret) 1460 intel_ppat_put(entry); 1461 else 1462 ret = put_and_check_entry(entries[i]); 1463 } 1464 kfree(entries); 1465 entries = NULL; 1466 } 1467 if (ret) 1468 return ret; 1469 1470 return igt_ppat_check(i915); 1471 } 1472 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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