net/netlabel/netlabel_domainhash.c:495:35: warning: variable 'old_list6' set but not used

From: kernel test robot
Date: Mon Sep 27 2021 - 10:51:20 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 92477dd1faa650e50bd3bb35a6c0b8d09198cc35
commit: 010b430d5df556d5d232e3751ac691ba9e88c041 mptcp: MPTCP_IPV6 should depend on IPV6 instead of selecting it
date: 11 months ago
config: nds32-randconfig-r022-20210927 (attached as .config)
compiler: nds32le-linux-gcc (GCC) 11.2.0
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
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=010b430d5df556d5d232e3751ac691ba9e88c041
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 010b430d5df556d5d232e3751ac691ba9e88c041
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=nds32

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

net/netlabel/netlabel_domainhash.c: In function 'netlbl_domhsh_add':
>> net/netlabel/netlabel_domainhash.c:495:35: warning: variable 'old_list6' set but not used [-Wunused-but-set-variable]
495 | struct list_head *old_list6;
| ^~~~~~~~~

vim +/old_list6 +495 net/netlabel/netlabel_domainhash.c

63c41688743760 Paul Moore 2008-10-10 416
6b21e1b77d1a3d Paul Moore 2013-05-17 417 ret_val = netlbl_domhsh_validate(entry);
6b21e1b77d1a3d Paul Moore 2013-05-17 418 if (ret_val != 0)
6b21e1b77d1a3d Paul Moore 2013-05-17 419 return ret_val;
6b21e1b77d1a3d Paul Moore 2013-05-17 420
b914f3a2a35812 Paul Moore 2010-04-01 421 /* XXX - we can remove this RCU read lock as the spinlock protects the
b914f3a2a35812 Paul Moore 2010-04-01 422 * entire function, but before we do we need to fixup the
b914f3a2a35812 Paul Moore 2010-04-01 423 * netlbl_af[4,6]list RCU functions to do "the right thing" with
b914f3a2a35812 Paul Moore 2010-04-01 424 * respect to rcu_dereference() when only a spinlock is held. */
63c41688743760 Paul Moore 2008-10-10 425 rcu_read_lock();
63c41688743760 Paul Moore 2008-10-10 426 spin_lock(&netlbl_domhsh_lock);
63c41688743760 Paul Moore 2008-10-10 427 if (entry->domain != NULL)
8f18e675c3335b Huw Davies 2016-06-27 428 entry_old = netlbl_domhsh_search(entry->domain, entry->family);
63c41688743760 Paul Moore 2008-10-10 429 else
8f18e675c3335b Huw Davies 2016-06-27 430 entry_old = netlbl_domhsh_search_def(entry->domain,
8f18e675c3335b Huw Davies 2016-06-27 431 entry->family);
63c41688743760 Paul Moore 2008-10-10 432 if (entry_old == NULL) {
d15c345fe3b8df Paul Moore 2006-08-03 433 entry->valid = 1;
d15c345fe3b8df Paul Moore 2006-08-03 434
d15c345fe3b8df Paul Moore 2006-08-03 435 if (entry->domain != NULL) {
63c41688743760 Paul Moore 2008-10-10 436 u32 bkt = netlbl_domhsh_hash(entry->domain);
d15c345fe3b8df Paul Moore 2006-08-03 437 list_add_tail_rcu(&entry->list,
3482fd9099e8aa Paul Moore 2007-08-07 438 &rcu_dereference(netlbl_domhsh)->tbl[bkt]);
4be2700fb7b95f Paul Moore 2007-10-26 439 } else {
d15c345fe3b8df Paul Moore 2006-08-03 440 INIT_LIST_HEAD(&entry->list);
8f18e675c3335b Huw Davies 2016-06-27 441 switch (entry->family) {
8f18e675c3335b Huw Davies 2016-06-27 442 case AF_INET:
8f18e675c3335b Huw Davies 2016-06-27 443 rcu_assign_pointer(netlbl_domhsh_def_ipv4,
8f18e675c3335b Huw Davies 2016-06-27 444 entry);
8f18e675c3335b Huw Davies 2016-06-27 445 break;
8f18e675c3335b Huw Davies 2016-06-27 446 case AF_INET6:
8f18e675c3335b Huw Davies 2016-06-27 447 rcu_assign_pointer(netlbl_domhsh_def_ipv6,
8f18e675c3335b Huw Davies 2016-06-27 448 entry);
8f18e675c3335b Huw Davies 2016-06-27 449 break;
8f18e675c3335b Huw Davies 2016-06-27 450 case AF_UNSPEC:
8f18e675c3335b Huw Davies 2016-06-27 451 if (entry->def.type !=
8f18e675c3335b Huw Davies 2016-06-27 452 NETLBL_NLTYPE_UNLABELED) {
8f18e675c3335b Huw Davies 2016-06-27 453 ret_val = -EINVAL;
8f18e675c3335b Huw Davies 2016-06-27 454 goto add_return;
8f18e675c3335b Huw Davies 2016-06-27 455 }
8f18e675c3335b Huw Davies 2016-06-27 456 entry_b = kzalloc(sizeof(*entry_b), GFP_ATOMIC);
8f18e675c3335b Huw Davies 2016-06-27 457 if (entry_b == NULL) {
8f18e675c3335b Huw Davies 2016-06-27 458 ret_val = -ENOMEM;
8f18e675c3335b Huw Davies 2016-06-27 459 goto add_return;
8f18e675c3335b Huw Davies 2016-06-27 460 }
8f18e675c3335b Huw Davies 2016-06-27 461 entry_b->family = AF_INET6;
8f18e675c3335b Huw Davies 2016-06-27 462 entry_b->def.type = NETLBL_NLTYPE_UNLABELED;
8f18e675c3335b Huw Davies 2016-06-27 463 entry_b->valid = 1;
8f18e675c3335b Huw Davies 2016-06-27 464 entry->family = AF_INET;
8f18e675c3335b Huw Davies 2016-06-27 465 rcu_assign_pointer(netlbl_domhsh_def_ipv4,
8f18e675c3335b Huw Davies 2016-06-27 466 entry);
8f18e675c3335b Huw Davies 2016-06-27 467 rcu_assign_pointer(netlbl_domhsh_def_ipv6,
8f18e675c3335b Huw Davies 2016-06-27 468 entry_b);
8f18e675c3335b Huw Davies 2016-06-27 469 break;
8f18e675c3335b Huw Davies 2016-06-27 470 default:
8f18e675c3335b Huw Davies 2016-06-27 471 /* Already checked in
8f18e675c3335b Huw Davies 2016-06-27 472 * netlbl_domhsh_validate(). */
8f18e675c3335b Huw Davies 2016-06-27 473 ret_val = -EINVAL;
8f18e675c3335b Huw Davies 2016-06-27 474 goto add_return;
8f18e675c3335b Huw Davies 2016-06-27 475 }
63c41688743760 Paul Moore 2008-10-10 476 }
63c41688743760 Paul Moore 2008-10-10 477
6a8b7f0c85f1f4 Paul Moore 2013-08-02 478 if (entry->def.type == NETLBL_NLTYPE_ADDRSELECT) {
63c41688743760 Paul Moore 2008-10-10 479 netlbl_af4list_foreach_rcu(iter4,
6a8b7f0c85f1f4 Paul Moore 2013-08-02 480 &entry->def.addrsel->list4)
63c41688743760 Paul Moore 2008-10-10 481 netlbl_domhsh_audit_add(entry, iter4, NULL,
63c41688743760 Paul Moore 2008-10-10 482 ret_val, audit_info);
dfd56b8b38fff3 Eric Dumazet 2011-12-10 483 #if IS_ENABLED(CONFIG_IPV6)
63c41688743760 Paul Moore 2008-10-10 484 netlbl_af6list_foreach_rcu(iter6,
6a8b7f0c85f1f4 Paul Moore 2013-08-02 485 &entry->def.addrsel->list6)
63c41688743760 Paul Moore 2008-10-10 486 netlbl_domhsh_audit_add(entry, NULL, iter6,
63c41688743760 Paul Moore 2008-10-10 487 ret_val, audit_info);
63c41688743760 Paul Moore 2008-10-10 488 #endif /* IPv6 */
63c41688743760 Paul Moore 2008-10-10 489 } else
63c41688743760 Paul Moore 2008-10-10 490 netlbl_domhsh_audit_add(entry, NULL, NULL,
63c41688743760 Paul Moore 2008-10-10 491 ret_val, audit_info);
6a8b7f0c85f1f4 Paul Moore 2013-08-02 492 } else if (entry_old->def.type == NETLBL_NLTYPE_ADDRSELECT &&
6a8b7f0c85f1f4 Paul Moore 2013-08-02 493 entry->def.type == NETLBL_NLTYPE_ADDRSELECT) {
63c41688743760 Paul Moore 2008-10-10 494 struct list_head *old_list4;
63c41688743760 Paul Moore 2008-10-10 @495 struct list_head *old_list6;
63c41688743760 Paul Moore 2008-10-10 496
6a8b7f0c85f1f4 Paul Moore 2013-08-02 497 old_list4 = &entry_old->def.addrsel->list4;
6a8b7f0c85f1f4 Paul Moore 2013-08-02 498 old_list6 = &entry_old->def.addrsel->list6;
63c41688743760 Paul Moore 2008-10-10 499
63c41688743760 Paul Moore 2008-10-10 500 /* we only allow the addition of address selectors if all of
63c41688743760 Paul Moore 2008-10-10 501 * the selectors do not exist in the existing domain map */
6a8b7f0c85f1f4 Paul Moore 2013-08-02 502 netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4)
63c41688743760 Paul Moore 2008-10-10 503 if (netlbl_af4list_search_exact(iter4->addr,
63c41688743760 Paul Moore 2008-10-10 504 iter4->mask,
63c41688743760 Paul Moore 2008-10-10 505 old_list4)) {
d15c345fe3b8df Paul Moore 2006-08-03 506 ret_val = -EEXIST;
63c41688743760 Paul Moore 2008-10-10 507 goto add_return;
4be2700fb7b95f Paul Moore 2007-10-26 508 }
dfd56b8b38fff3 Eric Dumazet 2011-12-10 509 #if IS_ENABLED(CONFIG_IPV6)
6a8b7f0c85f1f4 Paul Moore 2013-08-02 510 netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6)
63c41688743760 Paul Moore 2008-10-10 511 if (netlbl_af6list_search_exact(&iter6->addr,
63c41688743760 Paul Moore 2008-10-10 512 &iter6->mask,
63c41688743760 Paul Moore 2008-10-10 513 old_list6)) {
63c41688743760 Paul Moore 2008-10-10 514 ret_val = -EEXIST;
63c41688743760 Paul Moore 2008-10-10 515 goto add_return;
32f50cdee66633 Paul Moore 2006-09-28 516 }
63c41688743760 Paul Moore 2008-10-10 517 #endif /* IPv6 */
63c41688743760 Paul Moore 2008-10-10 518
63c41688743760 Paul Moore 2008-10-10 519 netlbl_af4list_foreach_safe(iter4, tmp4,
6a8b7f0c85f1f4 Paul Moore 2013-08-02 520 &entry->def.addrsel->list4) {
63c41688743760 Paul Moore 2008-10-10 521 netlbl_af4list_remove_entry(iter4);
63c41688743760 Paul Moore 2008-10-10 522 iter4->valid = 1;
63c41688743760 Paul Moore 2008-10-10 523 ret_val = netlbl_af4list_add(iter4, old_list4);
63c41688743760 Paul Moore 2008-10-10 524 netlbl_domhsh_audit_add(entry_old, iter4, NULL,
63c41688743760 Paul Moore 2008-10-10 525 ret_val, audit_info);
63c41688743760 Paul Moore 2008-10-10 526 if (ret_val != 0)
63c41688743760 Paul Moore 2008-10-10 527 goto add_return;
de64688ffb952a Paul Moore 2006-11-17 528 }
dfd56b8b38fff3 Eric Dumazet 2011-12-10 529 #if IS_ENABLED(CONFIG_IPV6)
63c41688743760 Paul Moore 2008-10-10 530 netlbl_af6list_foreach_safe(iter6, tmp6,
6a8b7f0c85f1f4 Paul Moore 2013-08-02 531 &entry->def.addrsel->list6) {
63c41688743760 Paul Moore 2008-10-10 532 netlbl_af6list_remove_entry(iter6);
63c41688743760 Paul Moore 2008-10-10 533 iter6->valid = 1;
63c41688743760 Paul Moore 2008-10-10 534 ret_val = netlbl_af6list_add(iter6, old_list6);
63c41688743760 Paul Moore 2008-10-10 535 netlbl_domhsh_audit_add(entry_old, NULL, iter6,
63c41688743760 Paul Moore 2008-10-10 536 ret_val, audit_info);
63c41688743760 Paul Moore 2008-10-10 537 if (ret_val != 0)
63c41688743760 Paul Moore 2008-10-10 538 goto add_return;
63c41688743760 Paul Moore 2008-10-10 539 }
63c41688743760 Paul Moore 2008-10-10 540 #endif /* IPv6 */
d3b990b7f327e2 Paul Moore 2020-08-21 541 /* cleanup the new entry since we've moved everything over */
d3b990b7f327e2 Paul Moore 2020-08-21 542 netlbl_domhsh_free_entry(&entry->rcu);
63c41688743760 Paul Moore 2008-10-10 543 } else
63c41688743760 Paul Moore 2008-10-10 544 ret_val = -EINVAL;
d15c345fe3b8df Paul Moore 2006-08-03 545
63c41688743760 Paul Moore 2008-10-10 546 add_return:
63c41688743760 Paul Moore 2008-10-10 547 spin_unlock(&netlbl_domhsh_lock);
63c41688743760 Paul Moore 2008-10-10 548 rcu_read_unlock();
d15c345fe3b8df Paul Moore 2006-08-03 549 return ret_val;
d15c345fe3b8df Paul Moore 2006-08-03 550 }
d15c345fe3b8df Paul Moore 2006-08-03 551

:::::: The code at line 495 was first introduced by commit
:::::: 63c41688743760631188cf0f4ae986a6793ccb0a netlabel: Add network address selectors to the NetLabel/LSM domain mapping

:::::: TO: Paul Moore <paul.moore@xxxxxx>
:::::: CC: Paul Moore <paul.moore@xxxxxx>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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