diff options
| author | Kent Overstreet <kent.overstreet@gmail.com> | 2021-07-10 22:46:17 -0400 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2023-11-12 00:36:54 -0500 |
| commit | e7bc73670bab14e94cf12be0f45ccea2ae3a1851 (patch) | |
| tree | cd88adb8bfc3a8ac6bc7ab147a88aac7adfa7a08 | |
| parent | d243b74f6c2a7b35e552a41ce42ef04d02b2f6fb (diff) | |
locking/lockdep: lock_class_is_held()
This patch adds lock_class_is_held(), which can be used to assert that a
particular type of lock is not held.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Will Deacon <will@kernel.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
| -rw-r--r-- | include/linux/lockdep.h | 4 | ||||
| -rw-r--r-- | kernel/locking/lockdep.c | 20 |
2 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index dc2844b071c2..fc86557d2a21 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -344,6 +344,8 @@ extern void lock_unpin_lock(struct lockdep_map *lock, struct pin_cookie); #define lockdep_repin_lock(l,c) lock_repin_lock(&(l)->dep_map, (c)) #define lockdep_unpin_lock(l,c) lock_unpin_lock(&(l)->dep_map, (c)) +int lock_class_is_held(struct lock_class_key *key); + /* * Must use lock_map_aquire_try() with override maps to avoid * lockdep thinking they participate in the block chain. @@ -442,6 +444,8 @@ extern int lockdep_is_held(const void *); #define lockdep_repin_lock(l, c) do { (void)(l); (void)(c); } while (0) #define lockdep_unpin_lock(l, c) do { (void)(l); (void)(c); } while (0) +static inline int lock_class_is_held(struct lock_class_key *key) { return 0; } + #define DEFINE_WAIT_OVERRIDE_MAP(_name, _wait_type) \ struct lockdep_map __maybe_unused _name = {} diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index e85b5ad3e206..38924d90da85 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -6599,6 +6599,26 @@ void debug_check_no_locks_held(void) } EXPORT_SYMBOL_GPL(debug_check_no_locks_held); +#ifdef CONFIG_LOCKDEP +int lock_class_is_held(struct lock_class_key *key) +{ + struct task_struct *curr = current; + struct held_lock *hlock; + + if (unlikely(!debug_locks)) + return 0; + + for (hlock = curr->held_locks; + hlock < curr->held_locks + curr->lockdep_depth; + hlock++) + if (hlock->instance->key == key) + return 1; + + return 0; +} +EXPORT_SYMBOL_GPL(lock_class_is_held); +#endif + #ifdef __KERNEL__ void debug_show_all_locks(void) { |