Hi Changbin, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v4.17 next-20180608] [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/changbin-du-intel-com/kernel-hacking-GCC-optimization-for-better-debug-experience-Og/20180606-001415 config: i386-randconfig-x076-06101602 (attached as .config) compiler: gcc-7 (Debian 7.3.0-16) 7.3.0 reproduce: # save the attached .config to linux build tree make ARCH=i386 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//usb/typec/fusb302/fusb302.c: In function 'fusb302_handle_togdone_src': >> drivers//usb/typec/fusb302/fusb302.c:1413:10: warning: 'ra_comp' may be used uninitialized in this function [-Wmaybe-uninitialized] else if (ra_comp) ^ -- drivers/infiniband/ulp/ipoib/ipoib_main.c: In function 'ipoib_get_netdev': >> drivers/infiniband/ulp/ipoib/ipoib_main.c:2021:30: warning: 'dev' may be used uninitialized in this function [-Wmaybe-uninitialized] if (!hca->alloc_rdma_netdev || PTR_ERR(dev) == -EOPNOTSUPP) -- kernel//cgroup/cgroup-v1.c: In function 'cgroup1_mount': >> kernel//cgroup/cgroup-v1.c:1268:3: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized] percpu_ref_reinit(&root->cgrp.self.refcnt); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- kernel//trace/bpf_trace.c: In function 'bpf_trace_printk': >> kernel//trace/bpf_trace.c:226:20: warning: 'unsafe_addr' may be used uninitialized in this function [-Wmaybe-uninitialized] (void *) (long) unsafe_addr, ^~~~~~~~~~~~~~~~~~ kernel//trace/bpf_trace.c:170:6: note: 'unsafe_addr' was declared here u64 unsafe_addr; ^~~~~~~~~~~ -- net//6lowpan/iphc.c: In function 'lowpan_header_decompress': net//6lowpan/iphc.c:617:12: warning: 'iphc1' may be used uninitialized in this function [-Wmaybe-uninitialized] u8 iphc0, iphc1, cid = 0; ^~~~~ >> net//6lowpan/iphc.c:617:5: warning: 'iphc0' may be used uninitialized in this function [-Wmaybe-uninitialized] u8 iphc0, iphc1, cid = 0; ^~~~~ -- net//netfilter/nf_tables_api.c: In function 'nf_tables_dump_set': >> net//netfilter/nf_tables_api.c:3625:2: warning: 'set' may be used uninitialized in this function [-Wmaybe-uninitialized] set->ops->walk(&dump_ctx->ctx, set, &args.iter); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- drivers/media/dvb-frontends/mn88472.c: In function 'mn88472_set_frontend': >> drivers/media/dvb-frontends/mn88472.c:339:27: warning: 'bandwidth_vals_ptr' may be used uninitialized in this function [-Wmaybe-uninitialized] bandwidth_vals_ptr[i]); ^ >> drivers/media/dvb-frontends/mn88472.c:320:8: warning: 'bandwidth_val' may be used uninitialized in this function [-Wmaybe-uninitialized] ret = regmap_write(dev->regmap[2], 0x04, bandwidth_val); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- drivers/media/dvb-frontends/mn88473.c: In function 'mn88473_set_frontend': >> drivers/media/dvb-frontends/mn88473.c:162:7: warning: 'conf_val_ptr' may be used uninitialized in this function [-Wmaybe-uninitialized] ret = regmap_bulk_write(dev->regmap[1], 0x10, conf_val_ptr, 6); ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- net//netfilter/ipvs/ip_vs_sync.c: In function 'ip_vs_sync_conn': >> net//netfilter/ipvs/ip_vs_sync.c:731:13: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized] m->nr_conns++; ~~~~~~~~~~~^~ -- drivers//hwspinlock/hwspinlock_core.c: In function 'of_hwspin_lock_get_id': >> drivers//hwspinlock/hwspinlock_core.c:339:19: warning: 'id' may be used uninitialized in this function [-Wmaybe-uninitialized] return ret ? ret : id; ~~~~~~~~~~^~~~ -- drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c: In function 'mlxsw_sp_nexthop_group_update': >> drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:3078:7: warning: 'err' may be used uninitialized in this function [-Wmaybe-uninitialized] if (err) ^ vim +/ra_comp +1413 drivers//usb/typec/fusb302/fusb302.c c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1359 c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1360 static int fusb302_handle_togdone_src(struct fusb302_chip *chip, c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1361 u8 togdone_result) c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1362 { c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1363 /* c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1364 * - set polarity (measure cc, vconn, tx) c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1365 * - set pull_up, pull_down c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1366 * - set cc1, cc2, and update to tcpm_port c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1367 * - set I_COMP interrupt on c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1368 */ c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1369 int ret = 0; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1370 u8 status0; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1371 u8 ra_mda = ra_mda_value[chip->src_current_status]; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1372 u8 rd_mda = rd_mda_value[chip->src_current_status]; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1373 bool ra_comp, rd_comp; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1374 enum typec_cc_polarity cc_polarity; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1375 enum typec_cc_status cc_status_active, cc1, cc2; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1376 c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1377 /* set pull_up, pull_down */ c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1378 ret = fusb302_set_cc_pull(chip, true, false); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1379 if (ret < 0) { c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1380 fusb302_log(chip, "cannot set cc to pull up, ret=%d", ret); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1381 return ret; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1382 } c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1383 /* set polarity */ c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1384 cc_polarity = (togdone_result == FUSB_REG_STATUS1A_TOGSS_SRC1) ? c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1385 TYPEC_POLARITY_CC1 : TYPEC_POLARITY_CC2; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1386 ret = fusb302_set_cc_polarity(chip, cc_polarity); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1387 if (ret < 0) { c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1388 fusb302_log(chip, "cannot set cc polarity %s, ret=%d", c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1389 cc_polarity_name[cc_polarity], ret); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1390 return ret; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1391 } c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1392 /* fusb302_set_cc_polarity() has set the correct measure block */ c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1393 ret = fusb302_i2c_write(chip, FUSB_REG_MEASURE, rd_mda); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1394 if (ret < 0) c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1395 return ret; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1396 usleep_range(50, 100); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1397 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &status0); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1398 if (ret < 0) c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1399 return ret; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1400 rd_comp = !!(status0 & FUSB_REG_STATUS0_COMP); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1401 if (!rd_comp) { c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1402 ret = fusb302_i2c_write(chip, FUSB_REG_MEASURE, ra_mda); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1403 if (ret < 0) c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1404 return ret; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1405 usleep_range(50, 100); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1406 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &status0); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1407 if (ret < 0) c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1408 return ret; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1409 ra_comp = !!(status0 & FUSB_REG_STATUS0_COMP); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1410 } c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1411 if (rd_comp) c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1412 cc_status_active = TYPEC_CC_OPEN; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 @1413 else if (ra_comp) c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1414 cc_status_active = TYPEC_CC_RD; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1415 else c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1416 /* Ra is not supported, report as Open */ c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1417 cc_status_active = TYPEC_CC_OPEN; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1418 /* restart toggling if the cc status on the active line is OPEN */ c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1419 if (cc_status_active == TYPEC_CC_OPEN) { c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1420 fusb302_log(chip, "restart toggling as CC_OPEN detected"); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1421 ret = fusb302_set_toggling(chip, chip->toggling_mode); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1422 return ret; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1423 } c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1424 /* update tcpm with the new cc value */ c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1425 cc1 = (cc_polarity == TYPEC_POLARITY_CC1) ? c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1426 cc_status_active : TYPEC_CC_OPEN; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1427 cc2 = (cc_polarity == TYPEC_POLARITY_CC2) ? c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1428 cc_status_active : TYPEC_CC_OPEN; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1429 if ((chip->cc1 != cc1) || (chip->cc2 != cc2)) { c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1430 chip->cc1 = cc1; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1431 chip->cc2 = cc2; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1432 tcpm_cc_change(chip->tcpm_port); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1433 } c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1434 /* turn off toggling */ c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1435 ret = fusb302_set_toggling(chip, TOGGLINE_MODE_OFF); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1436 if (ret < 0) { c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1437 fusb302_log(chip, c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1438 "cannot set toggling mode off, ret=%d", ret); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1439 return ret; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1440 } c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1441 /* set MDAC to Rd threshold, and unmask I_COMP for unplug detection */ c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1442 ret = fusb302_i2c_write(chip, FUSB_REG_MEASURE, rd_mda); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1443 if (ret < 0) c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1444 return ret; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1445 /* unmask comp_chng interrupt */ c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1446 ret = fusb302_i2c_clear_bits(chip, FUSB_REG_MASK, c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1447 FUSB_REG_MASK_COMP_CHNG); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1448 if (ret < 0) { c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1449 fusb302_log(chip, c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1450 "cannot unmask bc_lcl interrupt, ret=%d", ret); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1451 return ret; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1452 } c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1453 chip->intr_comp_chng = true; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1454 fusb302_log(chip, "detected cc1=%s, cc2=%s", c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1455 typec_cc_status_name[cc1], c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1456 typec_cc_status_name[cc2]); c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1457 c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1458 return ret; c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1459 } c034a43e drivers/staging/typec/fusb302/fusb302.c Yueyao Zhu 2017-04-27 1460 :::::: The code at line 1413 was first introduced by commit :::::: c034a43e72dda58e4a184d71f5502ef356e04453 staging: typec: Fairchild FUSB302 Type-c chip driver :::::: TO: Yueyao Zhu <yueyao@xxxxxxxxxx> :::::: CC: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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