diff options
Diffstat (limited to 'include/linux/semaphore.h')
| -rw-r--r-- | include/linux/semaphore.h | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/include/linux/semaphore.h b/include/linux/semaphore.h index 04655faadc2d..a4c8651ef021 100644 --- a/include/linux/semaphore.h +++ b/include/linux/semaphore.h @@ -15,14 +15,26 @@ struct semaphore { raw_spinlock_t lock; unsigned int count; - struct list_head wait_list; + struct semaphore_waiter *first_waiter; + +#ifdef CONFIG_DETECT_HUNG_TASK_BLOCKER + unsigned long last_holder; +#endif }; +#ifdef CONFIG_DETECT_HUNG_TASK_BLOCKER +#define __LAST_HOLDER_SEMAPHORE_INITIALIZER \ + , .last_holder = 0UL +#else +#define __LAST_HOLDER_SEMAPHORE_INITIALIZER +#endif + #define __SEMAPHORE_INITIALIZER(name, n) \ { \ .lock = __RAW_SPIN_LOCK_UNLOCKED((name).lock), \ .count = n, \ - .wait_list = LIST_HEAD_INIT((name).wait_list), \ + .first_waiter = NULL \ + __LAST_HOLDER_SEMAPHORE_INITIALIZER \ } /* @@ -47,5 +59,6 @@ extern int __must_check down_killable(struct semaphore *sem); extern int __must_check down_trylock(struct semaphore *sem); extern int __must_check down_timeout(struct semaphore *sem, long jiffies); extern void up(struct semaphore *sem); +extern unsigned long sem_last_holder(struct semaphore *sem); #endif /* __LINUX_SEMAPHORE_H */ |