diff options
Diffstat (limited to 'kernel/locking/mutex.c')
| -rw-r--r-- | kernel/locking/mutex.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c index 19b636f60a24..555e2b3a665a 100644 --- a/kernel/locking/mutex.c +++ b/kernel/locking/mutex.c @@ -72,6 +72,14 @@ static inline unsigned long __owner_flags(unsigned long owner) return owner & MUTEX_FLAGS; } +/* Do not use the return value as a pointer directly. */ +unsigned long mutex_get_owner(struct mutex *lock) +{ + unsigned long owner = atomic_long_read(&lock->owner); + + return (unsigned long)__owner_task(owner); +} + /* * Returns: __mutex_owner(lock) on failure or NULL on success. */ @@ -182,6 +190,9 @@ static void __mutex_add_waiter(struct mutex *lock, struct mutex_waiter *waiter, struct list_head *list) { +#ifdef CONFIG_DETECT_HUNG_TASK_BLOCKER + WRITE_ONCE(current->blocker_mutex, lock); +#endif debug_mutex_add_waiter(lock, waiter, current); list_add_tail(&waiter->list, list); @@ -197,6 +208,9 @@ __mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter) __mutex_clear_flag(lock, MUTEX_FLAGS); debug_mutex_remove_waiter(lock, waiter, current); +#ifdef CONFIG_DETECT_HUNG_TASK_BLOCKER + WRITE_ONCE(current->blocker_mutex, NULL); +#endif } /* |