Add an interface for a user-defined workqueue lockdep map, which is helpful when multiple workqueues are created for the same purpose. This also helps avoid leaking lockdep maps on each workqueue creation. v2: - Add alloc_workqueue_lockdep_map (Tejun) v3: - Drop __WQ_USER_OWNED_LOCKDEP (Tejun) - static inline alloc_ordered_workqueue_lockdep_map (Tejun)
Showing the changes to kernel/workqueue.c (1 of 2 files). Show all
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| @@ -4775,11 +4775,17 @@ static void wq_init_lockdep(struct workqueue_struct *wq) · 4774 unmodified lines | |||
| 4775 | 4775 | ||
| 4776 | static void wq_unregister_lockdep(struct workqueue_struct *wq) | 4776 | static void wq_unregister_lockdep(struct workqueue_struct *wq) |
| 4777 | { | 4777 | { |
| 4778 | if (wq->lockdep_map != &wq->__lockdep_map) | ||
| 4779 | return; | ||
| 4780 | |||
| 4778 | lockdep_unregister_key(&wq->key); | 4781 | lockdep_unregister_key(&wq->key); |
| 4779 | } | 4782 | } |
| 4780 | 4783 | ||
| 4781 | static void wq_free_lockdep(struct workqueue_struct *wq) | 4784 | static void wq_free_lockdep(struct workqueue_struct *wq) |
| 4782 | { | 4785 | { |
| 4786 | if (wq->lockdep_map != &wq->__lockdep_map) | ||
| 4787 | return; | ||
| 4788 | |||
| 4783 | if (wq->lock_name != wq->name) | 4789 | if (wq->lock_name != wq->name) |
| 4784 | kfree(wq->lock_name); | 4790 | kfree(wq->lock_name); |
| 4785 | } | 4791 | } |
| @@ -5756,6 +5762,28 @@ struct workqueue_struct *alloc_workqueue(const char *fmt, · 970 unmodified lines | |||
| 5756 | } | 5762 | } |
| 5757 | EXPORT_SYMBOL_GPL(alloc_workqueue); | 5763 | EXPORT_SYMBOL_GPL(alloc_workqueue); |
| 5758 | 5764 | ||
| 5765 | #ifdef CONFIG_LOCKDEP | ||
| 5766 | __printf(1, 5) | ||
| 5767 | struct workqueue_struct * | ||
| 5768 | alloc_workqueue_lockdep_map(const char *fmt, unsigned int flags, | ||
| 5769 | int max_active, struct lockdep_map *lockdep_map, ...) | ||
| 5770 | { | ||
| 5771 | struct workqueue_struct *wq; | ||
| 5772 | va_list args; | ||
| 5773 | |||
| 5774 | va_start(args, lockdep_map); | ||
| 5775 | wq = __alloc_workqueue(fmt, flags, max_active, args); | ||
| 5776 | va_end(args); | ||
| 5777 | if (!wq) | ||
| 5778 | return NULL; | ||
| 5779 | |||
| 5780 | wq->lockdep_map = lockdep_map; | ||
| 5781 | |||
| 5782 | return wq; | ||
| 5783 | } | ||
| 5784 | EXPORT_SYMBOL_GPL(alloc_workqueue_lockdep_map); | ||
| 5785 | #endif | ||
| 5786 | |||
| 5759 | static bool pwq_busy(struct pool_workqueue *pwq) | 5787 | static bool pwq_busy(struct pool_workqueue *pwq) |
| 5760 | { | 5788 | { |
| 5761 | int i; | 5789 | int i; |