Messages in this thread Patch in this message | | | From | Kent Overstreet <> | Subject | [PATCH 02/32] locking/lockdep: lock_class_is_held() | Date | Tue, 9 May 2023 12:56:27 -0400 |
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From: Kent Overstreet <kent.overstreet@gmail.com>
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> --- include/linux/lockdep.h | 4 ++++ kernel/locking/lockdep.c | 20 ++++++++++++++++++++ 2 files changed, 24 insertions(+)
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index 1023f349af..e858c288c7 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -339,6 +339,8 @@ 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); + #else /* !CONFIG_LOCKDEP */ static inline void lockdep_init_task(struct task_struct *task) @@ -427,6 +429,8 @@ 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; } + #endif /* !LOCKDEP */ enum xhlock_context_t { diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 50d4863974..e631464070 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -6487,6 +6487,26 @@ 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) { -- 2.40.1
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