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authorThomas Gleixner <tglx@linutronix.de>2009-11-17 14:46:14 +0100
committerThomas Gleixner <tglx@linutronix.de>2009-12-14 23:55:33 +0100
commita26724591edba5acc528d41f3906a972590e8f54 (patch)
tree4e7a1c7c7e4b19b428222da9232aa7322439e243
parentfa4062e7eae8f484c90b9cdd850b5df39ab0e5a0 (diff)
downloadlinux-a26724591edba5acc528d41f3906a972590e8f54.tar.gz
plist: Make plist debugging raw_spinlock aware
plists are used with spinlocks and raw_spinlocks. Change the plist debugging to handle both types. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--include/linux/plist.h43
-rw-r--r--kernel/futex.c6
-rw-r--r--lib/plist.c8
3 files changed, 45 insertions, 12 deletions
diff --git a/include/linux/plist.h b/include/linux/plist.h
index 45926d77d6a..8227f717c70 100644
--- a/include/linux/plist.h
+++ b/include/linux/plist.h
@@ -81,7 +81,8 @@ struct plist_head {
struct list_head prio_list;
struct list_head node_list;
#ifdef CONFIG_DEBUG_PI_LIST
- spinlock_t *lock;
+ raw_spinlock_t *rawlock;
+ spinlock_t *spinlock;
#endif
};
@@ -91,9 +92,11 @@ struct plist_node {
};
#ifdef CONFIG_DEBUG_PI_LIST
-# define PLIST_HEAD_LOCK_INIT(_lock) .lock = _lock
+# define PLIST_HEAD_LOCK_INIT(_lock) .spinlock = _lock
+# define PLIST_HEAD_LOCK_INIT_RAW(_lock) .rawlock = _lock
#else
# define PLIST_HEAD_LOCK_INIT(_lock)
+# define PLIST_HEAD_LOCK_INIT_RAW(_lock)
#endif
#define _PLIST_HEAD_INIT(head) \
@@ -107,11 +110,22 @@ struct plist_node {
*/
#define PLIST_HEAD_INIT(head, _lock) \
{ \
- _PLIST_HEAD_INIT(head), \
+ _PLIST_HEAD_INIT(head), \
PLIST_HEAD_LOCK_INIT(&(_lock)) \
}
/**
+ * PLIST_HEAD_INIT_RAW - static struct plist_head initializer
+ * @head: struct plist_head variable name
+ * @_lock: lock to initialize for this list
+ */
+#define PLIST_HEAD_INIT_RAW(head, _lock) \
+{ \
+ _PLIST_HEAD_INIT(head), \
+ PLIST_HEAD_LOCK_INIT_RAW(&(_lock)) \
+}
+
+/**
* PLIST_NODE_INIT - static struct plist_node initializer
* @node: struct plist_node variable name
* @__prio: initial node priority
@@ -119,13 +133,13 @@ struct plist_node {
#define PLIST_NODE_INIT(node, __prio) \
{ \
.prio = (__prio), \
- .plist = { _PLIST_HEAD_INIT((node).plist) }, \
+ .plist = { _PLIST_HEAD_INIT((node).plist) }, \
}
/**
* plist_head_init - dynamic struct plist_head initializer
* @head: &struct plist_head pointer
- * @lock: list spinlock, remembered for debugging
+ * @lock: spinlock protecting the list (debugging)
*/
static inline void
plist_head_init(struct plist_head *head, spinlock_t *lock)
@@ -133,7 +147,24 @@ plist_head_init(struct plist_head *head, spinlock_t *lock)
INIT_LIST_HEAD(&head->prio_list);
INIT_LIST_HEAD(&head->node_list);
#ifdef CONFIG_DEBUG_PI_LIST
- head->lock = lock;
+ head->spinlock = lock;
+ head->rawlock = NULL;
+#endif
+}
+
+/**
+ * plist_head_init_raw - dynamic struct plist_head initializer
+ * @head: &struct plist_head pointer
+ * @lock: raw_spinlock protecting the list (debugging)
+ */
+static inline void
+plist_head_init_raw(struct plist_head *head, raw_spinlock_t *lock)
+{
+ INIT_LIST_HEAD(&head->prio_list);
+ INIT_LIST_HEAD(&head->node_list);
+#ifdef CONFIG_DEBUG_PI_LIST
+ head->rawlock = lock;
+ head->spinlock = NULL;
#endif
}
diff --git a/kernel/futex.c b/kernel/futex.c
index d73ef1f3e55..6af474df17b 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -1010,7 +1010,7 @@ void requeue_futex(struct futex_q *q, struct futex_hash_bucket *hb1,
plist_add(&q->list, &hb2->chain);
q->lock_ptr = &hb2->lock;
#ifdef CONFIG_DEBUG_PI_LIST
- q->list.plist.lock = &hb2->lock;
+ q->list.plist.spinlock = &hb2->lock;
#endif
}
get_futex_key_refs(key2);
@@ -1046,7 +1046,7 @@ void requeue_pi_wake_futex(struct futex_q *q, union futex_key *key,
q->lock_ptr = &hb->lock;
#ifdef CONFIG_DEBUG_PI_LIST
- q->list.plist.lock = &hb->lock;
+ q->list.plist.spinlock = &hb->lock;
#endif
wake_up_state(q->task, TASK_NORMAL);
@@ -1394,7 +1394,7 @@ static inline void queue_me(struct futex_q *q, struct futex_hash_bucket *hb)
plist_node_init(&q->list, prio);
#ifdef CONFIG_DEBUG_PI_LIST
- q->list.plist.lock = &hb->lock;
+ q->list.plist.spinlock = &hb->lock;
#endif
plist_add(&q->list, &hb->chain);
q->task = current;
diff --git a/lib/plist.c b/lib/plist.c
index d6c64a824e1..1471988d919 100644
--- a/lib/plist.c
+++ b/lib/plist.c
@@ -54,9 +54,11 @@ static void plist_check_list(struct list_head *top)
static void plist_check_head(struct plist_head *head)
{
- WARN_ON(!head->lock);
- if (head->lock)
- WARN_ON_SMP(!spin_is_locked(head->lock));
+ WARN_ON(!head->rawlock && !head->spinlock);
+ if (head->rawlock)
+ WARN_ON_SMP(!raw_spin_is_locked(head->rawlock));
+ if (head->spinlock)
+ WARN_ON_SMP(!spin_is_locked(head->spinlock));
plist_check_list(&head->prio_list);
plist_check_list(&head->node_list);
}