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| author | Pavel Emelyanov <xemul@openvz.org> | 2008-02-08 13:21:53 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-08 18:22:41 +0100 |
| commit | 48d13e483c5b450be451f78cc9cb43c0bdd6b7bb (patch) | |
| tree | c12c76e72ee5d1c202937c7327b2a05474fbcabc | |
| parent | Use find_task_by_vpid in posix timers (diff) | |
| download | linux-48d13e483c5b450be451f78cc9cb43c0bdd6b7bb.tar.xz linux-48d13e483c5b450be451f78cc9cb43c0bdd6b7bb.zip | |
Don't operate with pid_t in rtmutex tester
The proper behavior to store task's pid and get this task later is to get the
struct pid pointer and get the task with the pid_task() call.
Make it for rt_mutex_waiter->deadlock_task_pid field.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | kernel/rtmutex-debug.c | 12 | ||||
| -rw-r--r-- | kernel/rtmutex_common.h | 2 |
2 files changed, 10 insertions, 4 deletions
diff --git a/kernel/rtmutex-debug.c b/kernel/rtmutex-debug.c index 56d73cb8826d..5fcb4fe645e2 100644 --- a/kernel/rtmutex-debug.c +++ b/kernel/rtmutex-debug.c @@ -130,7 +130,7 @@ void debug_rt_mutex_deadlock(int detect, struct rt_mutex_waiter *act_waiter, 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; } } @@ -142,9 +142,12 @@ void debug_rt_mutex_print_deadlock(struct rt_mutex_waiter *waiter) if (!waiter->deadlock_lock || !rt_trace_on) 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(); @@ -173,6 +176,7 @@ void debug_rt_mutex_print_deadlock(struct rt_mutex_waiter *waiter) 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"); @@ -203,10 +207,12 @@ 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) { + put_pid(waiter->deadlock_task_pid); TRACE_WARN_ON(!plist_node_empty(&waiter->list_entry)); TRACE_WARN_ON(!plist_node_empty(&waiter->pi_list_entry)); TRACE_WARN_ON(waiter->task); diff --git a/kernel/rtmutex_common.h b/kernel/rtmutex_common.h index 2d3b83593ca3..e124bf5800ea 100644 --- a/kernel/rtmutex_common.h +++ b/kernel/rtmutex_common.h @@ -51,7 +51,7 @@ struct rt_mutex_waiter { struct rt_mutex *lock; #ifdef CONFIG_DEBUG_RT_MUTEXES unsigned long ip; - pid_t deadlock_task_pid; + struct pid *deadlock_task_pid; struct rt_mutex *deadlock_lock; #endif }; |