* to use a raw spinlock - we really dont want the spinlock
* code to recurse back into the lockdep code...
*/
-static raw_spinlock_t lockdep_lock = (raw_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
* 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 */
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;
}
{
int ret = debug_locks_off();
- __raw_spin_unlock(&lockdep_lock);
+ arch_spin_unlock(&lockdep_lock);
return ret;
}
}
#ifdef CONFIG_LOCK_STAT
-static DEFINE_PER_CPU(struct lock_class_stats[MAX_LOCKDEP_KEYS], lock_stats);
+static DEFINE_PER_CPU(struct lock_class_stats[MAX_LOCKDEP_KEYS],
+ cpu_lock_stats);
static inline u64 lockstat_clock(void)
{
if (time > lt->max)
lt->max = time;
- if (time < lt->min || !lt->min)
+ if (time < lt->min || !lt->nr)
lt->min = time;
lt->total += time;
static inline void lock_time_add(struct lock_time *src, struct lock_time *dst)
{
- dst->min += src->min;
- dst->max += src->max;
+ if (!src->nr)
+ return;
+
+ if (src->max > dst->max)
+ dst->max = src->max;
+
+ if (src->min < dst->min || !dst->nr)
+ dst->min = src->min;
+
dst->total += src->total;
dst->nr += src->nr;
}
memset(&stats, 0, sizeof(struct lock_class_stats));
for_each_possible_cpu(cpu) {
struct lock_class_stats *pcs =
- &per_cpu(lock_stats, cpu)[class - lock_classes];
+ &per_cpu(cpu_lock_stats, cpu)[class - lock_classes];
for (i = 0; i < ARRAY_SIZE(stats.contention_point); i++)
stats.contention_point[i] += pcs->contention_point[i];
for_each_possible_cpu(cpu) {
struct lock_class_stats *cpu_stats =
- &per_cpu(lock_stats, cpu)[class - lock_classes];
+ &per_cpu(cpu_lock_stats, cpu)[class - lock_classes];
memset(cpu_stats, 0, sizeof(struct lock_class_stats));
}
static struct lock_class_stats *get_lock_stats(struct lock_class *class)
{
- return &get_cpu_var(lock_stats)[class - lock_classes];
+ return &get_cpu_var(cpu_lock_stats)[class - lock_classes];
}
static void put_lock_stats(struct lock_class_stats *stats)
{
- put_cpu_var(lock_stats);
+ put_cpu_var(cpu_lock_stats);
}
static void lock_release_holdtime(struct held_lock *hlock)
* complete trace that maxes out the entries provided will be reported
* as incomplete, friggin useless </rant>
*/
- if (trace->entries[trace->nr_entries-1] == ULONG_MAX)
+ if (trace->nr_entries != 0 &&
+ trace->entries[trace->nr_entries-1] == ULONG_MAX)
trace->nr_entries--;
trace->max_entries = trace->nr_entries;
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;
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;
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)
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);