*/
#include <linux/sched.h>
#include <linux/delay.h>
-#include <linux/module.h>
+#include <linux/export.h>
#include <linux/spinlock.h>
#include <linux/kallsyms.h>
#include <linux/syscalls.h>
#include "rtmutex_common.h"
-#ifdef CONFIG_DEBUG_RT_MUTEXES
-# include "rtmutex-debug.h"
-#else
-# include "rtmutex.h"
-#endif
-
-# define TRACE_WARN_ON(x) WARN_ON(x)
-# define TRACE_BUG_ON(x) BUG_ON(x)
-
-# define TRACE_OFF() \
-do { \
- if (rt_trace_on) { \
- rt_trace_on = 0; \
- console_verbose(); \
- if (spin_is_locked(¤t->pi_lock)) \
- spin_unlock(¤t->pi_lock); \
- } \
-} while (0)
-
-# define TRACE_OFF_NOLOCK() \
-do { \
- if (rt_trace_on) { \
- rt_trace_on = 0; \
- console_verbose(); \
- } \
-} while (0)
-
-# define TRACE_BUG_LOCKED() \
-do { \
- TRACE_OFF(); \
- BUG(); \
-} while (0)
-
-# define TRACE_WARN_ON_LOCKED(c) \
-do { \
- if (unlikely(c)) { \
- TRACE_OFF(); \
- WARN_ON(1); \
- } \
-} while (0)
-
-# define TRACE_BUG_ON_LOCKED(c) \
-do { \
- if (unlikely(c)) \
- TRACE_BUG_LOCKED(); \
-} while (0)
-
-#ifdef CONFIG_SMP
-# define SMP_TRACE_BUG_ON_LOCKED(c) TRACE_BUG_ON_LOCKED(c)
-#else
-# define SMP_TRACE_BUG_ON_LOCKED(c) do { } while (0)
-#endif
-
-/*
- * deadlock detection flag. We turn it off when we detect
- * the first problem because we dont want to recurse back
- * into the tracing code when doing error printk or
- * executing a BUG():
- */
-int rt_trace_on = 1;
-
-void deadlock_trace_off(void)
-{
- rt_trace_on = 0;
-}
-
static void printk_task(struct task_struct *p)
{
if (p)
- printk("%16s:%5d [%p, %3d]", p->comm, p->pid, p, p->prio);
+ printk("%16s:%5d [%p, %3d]", p->comm, task_pid_nr(p), p, p->prio);
else
printk("<none>");
}
void rt_mutex_debug_task_free(struct task_struct *task)
{
- WARN_ON(!plist_head_empty(&task->pi_waiters));
- WARN_ON(task->pi_blocked_on);
+ DEBUG_LOCKS_WARN_ON(!plist_head_empty(&task->pi_waiters));
+ DEBUG_LOCKS_WARN_ON(task->pi_blocked_on);
}
/*
{
struct task_struct *task;
- if (!rt_trace_on || detect || !act_waiter)
+ if (!debug_locks || detect || !act_waiter)
return;
task = rt_mutex_owner(act_waiter->lock);
if (task && task != current) {
- act_waiter->deadlock_task_pid = task->pid;
+ act_waiter->deadlock_task_pid = get_pid(task_pid(task));
act_waiter->deadlock_lock = lock;
}
}
{
struct task_struct *task;
- if (!waiter->deadlock_lock || !rt_trace_on)
+ if (!waiter->deadlock_lock || !debug_locks)
return;
- task = find_task_by_pid(waiter->deadlock_task_pid);
- if (!task)
+ rcu_read_lock();
+ task = pid_task(waiter->deadlock_task_pid, PIDTYPE_PID);
+ if (!task) {
+ rcu_read_unlock();
return;
+ }
- TRACE_OFF_NOLOCK();
+ if (!debug_locks_off()) {
+ rcu_read_unlock();
+ return;
+ }
printk("\n============================================\n");
printk( "[ BUG: circular locking deadlock detected! ]\n");
+ printk("%s\n", print_tainted());
printk( "--------------------------------------------\n");
printk("%s/%d is deadlocking current task %s/%d\n\n",
- task->comm, task->pid, current->comm, current->pid);
+ task->comm, task_pid_nr(task),
+ current->comm, task_pid_nr(current));
printk("\n1) %s/%d is trying to acquire this lock:\n",
- current->comm, current->pid);
+ current->comm, task_pid_nr(current));
printk_lock(waiter->lock, 1);
- printk("\n2) %s/%d is blocked on this lock:\n", task->comm, task->pid);
+ printk("\n2) %s/%d is blocked on this lock:\n",
+ task->comm, task_pid_nr(task));
printk_lock(waiter->deadlock_lock, 1);
debug_show_held_locks(current);
debug_show_held_locks(task);
- printk("\n%s/%d's [blocked] stackdump:\n\n", task->comm, task->pid);
+ printk("\n%s/%d's [blocked] stackdump:\n\n",
+ task->comm, task_pid_nr(task));
show_stack(task, NULL);
printk("\n%s/%d's [current] stackdump:\n\n",
- current->comm, current->pid);
+ current->comm, task_pid_nr(current));
dump_stack();
debug_show_all_locks();
+ rcu_read_unlock();
printk("[ turning off deadlock detection."
"Please report this trace. ]\n\n");
- local_irq_disable();
}
void debug_rt_mutex_lock(struct rt_mutex *lock)
void debug_rt_mutex_unlock(struct rt_mutex *lock)
{
- TRACE_WARN_ON_LOCKED(rt_mutex_owner(lock) != current);
+ DEBUG_LOCKS_WARN_ON(rt_mutex_owner(lock) != current);
}
void
void debug_rt_mutex_proxy_unlock(struct rt_mutex *lock)
{
- TRACE_WARN_ON_LOCKED(!rt_mutex_owner(lock));
+ DEBUG_LOCKS_WARN_ON(!rt_mutex_owner(lock));
}
void debug_rt_mutex_init_waiter(struct rt_mutex_waiter *waiter)
memset(waiter, 0x11, sizeof(*waiter));
plist_node_init(&waiter->list_entry, MAX_PRIO);
plist_node_init(&waiter->pi_list_entry, MAX_PRIO);
+ waiter->deadlock_task_pid = NULL;
}
void debug_rt_mutex_free_waiter(struct rt_mutex_waiter *waiter)
{
- TRACE_WARN_ON(!plist_node_empty(&waiter->list_entry));
- TRACE_WARN_ON(!plist_node_empty(&waiter->pi_list_entry));
- TRACE_WARN_ON(waiter->task);
+ put_pid(waiter->deadlock_task_pid);
+ DEBUG_LOCKS_WARN_ON(!plist_node_empty(&waiter->list_entry));
+ DEBUG_LOCKS_WARN_ON(!plist_node_empty(&waiter->pi_list_entry));
memset(waiter, 0x22, sizeof(*waiter));
}
projects / linux-flexiantxendom0-3.2.10.git / blobdiff