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plist: Make plist debugging raw_spinlock aware

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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>
This commit is contained in:
Thomas Gleixner 2009-11-17 14:46:14 +01:00
parent fa4062e7ea
commit a26724591e
3 changed files with 45 additions and 12 deletions
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43
include/linux/plist.h
View File

@ -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) \
@ -107,10 +110,21 @@ 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
@ -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
}

6
kernel/futex.c
View File

@ -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;

8
lib/plist.c
View File

@ -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);
}