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Diffstat (limited to 'lib/spinlock_debug.c')
-rw-r--r--lib/spinlock_debug.c98
1 files changed, 62 insertions, 36 deletions
diff --git a/lib/spinlock_debug.c b/lib/spinlock_debug.c
index 93c15ee3f8ea..3d9c4dc965ed 100644
--- a/lib/spinlock_debug.c
+++ b/lib/spinlock_debug.c
@@ -8,38 +8,71 @@
#include <linux/spinlock.h>
#include <linux/interrupt.h>
+#include <linux/debug_locks.h>
#include <linux/delay.h>
+#include <linux/module.h>
+
+void __spin_lock_init(spinlock_t *lock, const char *name,
+ struct lock_class_key *key)
+{
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ /*
+ * Make sure we are not reinitializing a held lock:
+ */
+ debug_check_no_locks_freed((void *)lock, sizeof(*lock));
+ lockdep_init_map(&lock->dep_map, name, key);
+#endif
+ lock->raw_lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
+ lock->magic = SPINLOCK_MAGIC;
+ lock->owner = SPINLOCK_OWNER_INIT;
+ lock->owner_cpu = -1;
+}
+
+EXPORT_SYMBOL(__spin_lock_init);
+
+void __rwlock_init(rwlock_t *lock, const char *name,
+ struct lock_class_key *key)
+{
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ /*
+ * Make sure we are not reinitializing a held lock:
+ */
+ debug_check_no_locks_freed((void *)lock, sizeof(*lock));
+ lockdep_init_map(&lock->dep_map, name, key);
+#endif
+ lock->raw_lock = (raw_rwlock_t) __RAW_RW_LOCK_UNLOCKED;
+ lock->magic = RWLOCK_MAGIC;
+ lock->owner = SPINLOCK_OWNER_INIT;
+ lock->owner_cpu = -1;
+}
+
+EXPORT_SYMBOL(__rwlock_init);
static void spin_bug(spinlock_t *lock, const char *msg)
{
- static long print_once = 1;
struct task_struct *owner = NULL;
- if (xchg(&print_once, 0)) {
- if (lock->owner && lock->owner != SPINLOCK_OWNER_INIT)
- owner = lock->owner;
- printk(KERN_EMERG "BUG: spinlock %s on CPU#%d, %s/%d\n",
- msg, raw_smp_processor_id(),
- current->comm, current->pid);
- printk(KERN_EMERG " lock: %p, .magic: %08x, .owner: %s/%d, "
- ".owner_cpu: %d\n",
- lock, lock->magic,
- owner ? owner->comm : "<none>",
- owner ? owner->pid : -1,
- lock->owner_cpu);
- dump_stack();
-#ifdef CONFIG_SMP
- /*
- * We cannot continue on SMP:
- */
-// panic("bad locking");
-#endif
- }
+ if (!debug_locks_off())
+ return;
+
+ if (lock->owner && lock->owner != SPINLOCK_OWNER_INIT)
+ owner = lock->owner;
+ printk(KERN_EMERG "BUG: spinlock %s on CPU#%d, %s/%d\n",
+ msg, raw_smp_processor_id(),
+ current->comm, current->pid);
+ printk(KERN_EMERG " lock: %p, .magic: %08x, .owner: %s/%d, "
+ ".owner_cpu: %d\n",
+ lock, lock->magic,
+ owner ? owner->comm : "<none>",
+ owner ? owner->pid : -1,
+ lock->owner_cpu);
+ dump_stack();
}
#define SPIN_BUG_ON(cond, lock, msg) if (unlikely(cond)) spin_bug(lock, msg)
-static inline void debug_spin_lock_before(spinlock_t *lock)
+static inline void
+debug_spin_lock_before(spinlock_t *lock)
{
SPIN_BUG_ON(lock->magic != SPINLOCK_MAGIC, lock, "bad magic");
SPIN_BUG_ON(lock->owner == current, lock, "recursion");
@@ -118,20 +151,13 @@ void _raw_spin_unlock(spinlock_t *lock)
static void rwlock_bug(rwlock_t *lock, const char *msg)
{
- static long print_once = 1;
-
- if (xchg(&print_once, 0)) {
- printk(KERN_EMERG "BUG: rwlock %s on CPU#%d, %s/%d, %p\n",
- msg, raw_smp_processor_id(), current->comm,
- current->pid, lock);
- dump_stack();
-#ifdef CONFIG_SMP
- /*
- * We cannot continue on SMP:
- */
- panic("bad locking");
-#endif
- }
+ if (!debug_locks_off())
+ return;
+
+ printk(KERN_EMERG "BUG: rwlock %s on CPU#%d, %s/%d, %p\n",
+ msg, raw_smp_processor_id(), current->comm,
+ current->pid, lock);
+ dump_stack();
}
#define RWLOCK_BUG_ON(cond, lock, msg) if (unlikely(cond)) rwlock_bug(lock, msg)