Merge branch 'perf-probes-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel...

[safe/jmp/linux-2.6] / kernel / lockdep.c

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 7cc50c6..0c30d04 100644 (file)
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -73,11 +73,11 @@ module_param(lock_stat, int, 0644);
  * to use a raw spinlock - we really dont want the spinlock
  * code to recurse back into the lockdep code...
  */
-static arch_spinlock_t lockdep_lock = (arch_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
+static arch_spinlock_t lockdep_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;
 
 static int graph_lock(void)
 {
-       __raw_spin_lock(&lockdep_lock);
+       arch_spin_lock(&lockdep_lock);
        /*
         * Make sure that if another CPU detected a bug while
         * walking the graph we dont change it (while the other
@@ -85,7 +85,7 @@ static int graph_lock(void)
         * dropped already)
         */
        if (!debug_locks) {
-               __raw_spin_unlock(&lockdep_lock);
+               arch_spin_unlock(&lockdep_lock);
                return 0;
        }
        /* prevent any recursions within lockdep from causing deadlocks */
@@ -95,11 +95,11 @@ static int graph_lock(void)
 
 static inline int graph_unlock(void)
 {
-       if (debug_locks && !__raw_spin_is_locked(&lockdep_lock))
+       if (debug_locks && !arch_spin_is_locked(&lockdep_lock))
                return DEBUG_LOCKS_WARN_ON(1);
 
        current->lockdep_recursion--;
-       __raw_spin_unlock(&lockdep_lock);
+       arch_spin_unlock(&lockdep_lock);
        return 0;
 }
 
@@ -111,7 +111,7 @@ static inline int debug_locks_off_graph_unlock(void)
 {
        int ret = debug_locks_off();
 
-       __raw_spin_unlock(&lockdep_lock);
+       arch_spin_unlock(&lockdep_lock);
 
        return ret;
 }
@@ -1170,9 +1170,9 @@ unsigned long lockdep_count_forward_deps(struct lock_class *class)
        this.class = class;
 
        local_irq_save(flags);
-       __raw_spin_lock(&lockdep_lock);
+       arch_spin_lock(&lockdep_lock);
        ret = __lockdep_count_forward_deps(&this);
-       __raw_spin_unlock(&lockdep_lock);
+       arch_spin_unlock(&lockdep_lock);
        local_irq_restore(flags);
 
        return ret;
@@ -1197,9 +1197,9 @@ unsigned long lockdep_count_backward_deps(struct lock_class *class)
        this.class = class;
 
        local_irq_save(flags);
-       __raw_spin_lock(&lockdep_lock);
+       arch_spin_lock(&lockdep_lock);
        ret = __lockdep_count_backward_deps(&this);
-       __raw_spin_unlock(&lockdep_lock);
+       arch_spin_unlock(&lockdep_lock);
        local_irq_restore(flags);
 
        return ret;
@@ -2147,7 +2147,7 @@ check_usage_backwards(struct task_struct *curr, struct held_lock *this,
                return ret;
 
        return print_irq_inversion_bug(curr, &root, target_entry,
-                                       this, 1, irqclass);
+                                       this, 0, irqclass);
 }
 
 void print_irqtrace_events(struct task_struct *curr)
@@ -3809,3 +3809,21 @@ void lockdep_sys_exit(void)
                lockdep_print_held_locks(curr);
        }
 }
+
+void lockdep_rcu_dereference(const char *file, const int line)
+{
+       struct task_struct *curr = current;
+
+       if (!debug_locks_off())
+               return;
+       printk("\n===================================================\n");
+       printk(  "[ INFO: suspicious rcu_dereference_check() usage. ]\n");
+       printk(  "---------------------------------------------------\n");
+       printk("%s:%d invoked rcu_dereference_check() without protection!\n",
+                       file, line);
+       printk("\nother info that might help us debug this:\n\n");
+       lockdep_print_held_locks(curr);
+       printk("\nstack backtrace:\n");
+       dump_stack();
+}
+EXPORT_SYMBOL_GPL(lockdep_rcu_dereference);