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| author | Cong Wang <xiyou.wangcong@gmail.com> | 2018-08-14 15:21:31 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-08-16 12:14:42 -0700 |
| commit | ff93bca769925a2d8fd7f910cdf543d992e17f07 (patch) | |
| tree | bab8928bc5d1fe07c2c206c5462e1b1aef8b8c74 /lib/bucket_locks.c | |
| parent | 32039eac4c48f70dfaad36a84f30356ededc7ea8 (diff) | |
| download | lwn-ff93bca769925a2d8fd7f910cdf543d992e17f07.tar.gz lwn-ff93bca769925a2d8fd7f910cdf543d992e17f07.zip | |
ila: make lockdep happy again
Previously, alloc_ila_locks() and bucket_table_alloc() call
spin_lock_init() separately, therefore they have two different
lock names and lock class keys. However, after commit b893281715ab
("ila: Call library function alloc_bucket_locks") they both call
helper alloc_bucket_spinlocks() which now only has one lock
name and lock class key. This causes a few bogus lockdep warnings
as reported by syzbot.
Fix this by making alloc_bucket_locks() a macro and pass declaration
name as lock name and a static lock class key inside the macro.
Fixes: b893281715ab ("ila: Call library function alloc_bucket_locks")
Reported-by: <syzbot+b66a5a554991a8ed027c@syzkaller.appspotmail.com>
Cc: Tom Herbert <tom@quantonium.net>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib/bucket_locks.c')
| -rw-r--r-- | lib/bucket_locks.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/lib/bucket_locks.c b/lib/bucket_locks.c index ade3ce6c4af6..64b92e1dbace 100644 --- a/lib/bucket_locks.c +++ b/lib/bucket_locks.c @@ -11,8 +11,9 @@ * to a power of 2 to be suitable as a hash table. */ -int alloc_bucket_spinlocks(spinlock_t **locks, unsigned int *locks_mask, - size_t max_size, unsigned int cpu_mult, gfp_t gfp) +int __alloc_bucket_spinlocks(spinlock_t **locks, unsigned int *locks_mask, + size_t max_size, unsigned int cpu_mult, gfp_t gfp, + const char *name, struct lock_class_key *key) { spinlock_t *tlocks = NULL; unsigned int i, size; @@ -33,8 +34,10 @@ int alloc_bucket_spinlocks(spinlock_t **locks, unsigned int *locks_mask, tlocks = kvmalloc_array(size, sizeof(spinlock_t), gfp); if (!tlocks) return -ENOMEM; - for (i = 0; i < size; i++) + for (i = 0; i < size; i++) { spin_lock_init(&tlocks[i]); + lockdep_init_map(&tlocks[i].dep_map, name, key, 0); + } } *locks = tlocks; @@ -42,7 +45,7 @@ int alloc_bucket_spinlocks(spinlock_t **locks, unsigned int *locks_mask, return 0; } -EXPORT_SYMBOL(alloc_bucket_spinlocks); +EXPORT_SYMBOL(__alloc_bucket_spinlocks); void free_bucket_spinlocks(spinlock_t *locks) { |