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Date: Fri, 15 Dec 2023 05:26:48 +0800
From: kernel test robot <lkp@...el.com>
To: Mark Rutland <mark.rutland@....com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
Ingo Molnar <mingo@...nel.org>
Subject: fs/notify/mark.c:462:13: sparse: sparse: incorrect type in
initializer (different address spaces)
Hi Mark,
FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 5bd7ef53ffe5ca580e93e74eb8c81ed191ddc4bd
commit: df79ed2c064363cdc7d2d896923c1885d4e30520 locking/atomics: Simplify cmpxchg() instrumentation
date: 5 years ago
config: x86_64-randconfig-x003-20230627 (https://download.01.org/0day-ci/archive/20231215/202312150531.zCYPyiP3-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231215/202312150531.zCYPyiP3-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202312150531.zCYPyiP3-lkp@intel.com/
sparse warnings: (new ones prefixed by >>)
>> fs/notify/mark.c:462:13: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct fsnotify_mark_connector [noderef] __rcu *__new @@ got struct fsnotify_mark_connector *[assigned] conn @@
fs/notify/mark.c:462:13: sparse: expected struct fsnotify_mark_connector [noderef] __rcu *__new
fs/notify/mark.c:462:13: sparse: got struct fsnotify_mark_connector *[assigned] conn
fs/notify/mark.c:224:9: sparse: sparse: context imbalance in 'fsnotify_put_mark' - unexpected unlock
fs/notify/mark.c:310:25: sparse: sparse: context imbalance in 'fsnotify_prepare_user_wait' - unexpected unlock
fs/notify/mark.c:325:9: sparse: sparse: context imbalance in 'fsnotify_finish_user_wait' - wrong count at exit
fs/notify/mark.c:478:39: sparse: sparse: context imbalance in 'fsnotify_grab_connector' - different lock contexts for basic block
fs/notify/mark.c:562:20: sparse: sparse: context imbalance in 'fsnotify_add_mark_list' - unexpected unlock
fs/notify/mark.c:646:25: sparse: sparse: context imbalance in 'fsnotify_find_mark' - unexpected unlock
fs/notify/mark.c:718:17: sparse: sparse: context imbalance in 'fsnotify_destroy_marks' - unexpected unlock
fs/notify/mark.o: warning: objtool: fsnotify_grab_connector()+0x17d: sibling call from callable instruction with modified stack frame
fs/notify/mark.o: warning: objtool: fsnotify_put_mark_wake()+0x9e: sibling call from callable instruction with modified stack frame
fs/notify/mark.o: warning: objtool: fsnotify_clear_marks_by_group()+0x1b2: sibling call from callable instruction with modified stack frame
vim +462 fs/notify/mark.c
8edc6e1688fc8f Jan Kara 2014-11-13 438
9dd813c15b2c10 Jan Kara 2017-03-14 439 static int fsnotify_attach_connector_to_object(
08991e83b72866 Jan Kara 2017-02-01 440 struct fsnotify_mark_connector __rcu **connp,
86ffe245c430f0 Jan Kara 2017-03-14 441 struct inode *inode,
86ffe245c430f0 Jan Kara 2017-03-14 442 struct vfsmount *mnt)
9dd813c15b2c10 Jan Kara 2017-03-14 443 {
9dd813c15b2c10 Jan Kara 2017-03-14 444 struct fsnotify_mark_connector *conn;
9dd813c15b2c10 Jan Kara 2017-03-14 445
755b5bc681eb46 Jan Kara 2017-03-14 446 conn = kmem_cache_alloc(fsnotify_mark_connector_cachep, GFP_KERNEL);
9dd813c15b2c10 Jan Kara 2017-03-14 447 if (!conn)
9dd813c15b2c10 Jan Kara 2017-03-14 448 return -ENOMEM;
04662cab59fc3e Jan Kara 2017-02-01 449 spin_lock_init(&conn->lock);
9dd813c15b2c10 Jan Kara 2017-03-14 450 INIT_HLIST_HEAD(&conn->list);
86ffe245c430f0 Jan Kara 2017-03-14 451 if (inode) {
d6f7b98bc8147a Amir Goldstein 2018-04-20 452 conn->type = FSNOTIFY_OBJ_TYPE_INODE;
08991e83b72866 Jan Kara 2017-02-01 453 conn->inode = igrab(inode);
86ffe245c430f0 Jan Kara 2017-03-14 454 } else {
d6f7b98bc8147a Amir Goldstein 2018-04-20 455 conn->type = FSNOTIFY_OBJ_TYPE_VFSMOUNT;
86ffe245c430f0 Jan Kara 2017-03-14 456 conn->mnt = mnt;
86ffe245c430f0 Jan Kara 2017-03-14 457 }
9dd813c15b2c10 Jan Kara 2017-03-14 458 /*
04662cab59fc3e Jan Kara 2017-02-01 459 * cmpxchg() provides the barrier so that readers of *connp can see
04662cab59fc3e Jan Kara 2017-02-01 460 * only initialized structure
9dd813c15b2c10 Jan Kara 2017-03-14 461 */
04662cab59fc3e Jan Kara 2017-02-01 @462 if (cmpxchg(connp, NULL, conn)) {
04662cab59fc3e Jan Kara 2017-02-01 463 /* Someone else created list structure for us */
08991e83b72866 Jan Kara 2017-02-01 464 if (inode)
08991e83b72866 Jan Kara 2017-02-01 465 iput(inode);
755b5bc681eb46 Jan Kara 2017-03-14 466 kmem_cache_free(fsnotify_mark_connector_cachep, conn);
04662cab59fc3e Jan Kara 2017-02-01 467 }
9dd813c15b2c10 Jan Kara 2017-03-14 468
9dd813c15b2c10 Jan Kara 2017-03-14 469 return 0;
9dd813c15b2c10 Jan Kara 2017-03-14 470 }
9dd813c15b2c10 Jan Kara 2017-03-14 471
:::::: The code at line 462 was first introduced by commit
:::::: 04662cab59fc3e8421fd7a0539d304d51d2750a4 fsnotify: Lock object list with connector lock
:::::: TO: Jan Kara <jack@...e.cz>
:::::: CC: Jan Kara <jack@...e.cz>
--
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