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>

3 files changed, 45 insertions, 12 deletions

diff --git a/include/linux/plist.h b/include/linux/plist.h
index 45926d77d6ac..8227f717c70f 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 d73ef1f3e55d..6af474df17bb 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 d6c64a824e1d..1471988d9190 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);
 }