locking: avoid passing around 'thread_info' in mutex debugging code

None of the code actually wants a thread_info, it all wants a
task_struct, and it's just converting back and forth between the two
("ti->task" to get the task_struct from the thread_info, and
"task_thread_info(task)" to go the other way).

No semantic change.

Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/locking/mutex-debug.c b/kernel/locking/mutex-debug.c
index 3ef3736..9c951fa 100644 (file)
--- a/kernel/locking/mutex-debug.c
+++ b/kernel/locking/mutex-debug.c
@@ -49,21 +49,21 @@ void debug_mutex_free_waiter(struct mutex_waiter *waiter)
 }
 
 void debug_mutex_add_waiter(struct mutex *lock, struct mutex_waiter *waiter,
-                           struct thread_info *ti)
+                           struct task_struct *task)
 {
        SMP_DEBUG_LOCKS_WARN_ON(!spin_is_locked(&lock->wait_lock));
 
        /* Mark the current thread as blocked on the lock: */
-       ti->task->blocked_on = waiter;
+       task->blocked_on = waiter;
 }
 
 void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
-                        struct thread_info *ti)
+                        struct task_struct *task)
 {
        DEBUG_LOCKS_WARN_ON(list_empty(&waiter->list));
-       DEBUG_LOCKS_WARN_ON(waiter->task != ti->task);
-       DEBUG_LOCKS_WARN_ON(ti->task->blocked_on != waiter);
-       ti->task->blocked_on = NULL;
+       DEBUG_LOCKS_WARN_ON(waiter->task != task);
+       DEBUG_LOCKS_WARN_ON(task->blocked_on != waiter);
+       task->blocked_on = NULL;
 
        list_del_init(&waiter->list);
        waiter->task = NULL;

diff --git a/kernel/locking/mutex-debug.h b/kernel/locking/mutex-debug.h
index 0799fd3..d06ae3b 100644 (file)
--- a/kernel/locking/mutex-debug.h
+++ b/kernel/locking/mutex-debug.h
@@ -20,9 +20,9 @@ extern void debug_mutex_wake_waiter(struct mutex *lock,
 extern void debug_mutex_free_waiter(struct mutex_waiter *waiter);
 extern void debug_mutex_add_waiter(struct mutex *lock,
                                   struct mutex_waiter *waiter,
-                                  struct thread_info *ti);
+                                  struct task_struct *task);
 extern void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
-                               struct thread_info *ti);
+                               struct task_struct *task);
 extern void debug_mutex_unlock(struct mutex *lock);
 extern void debug_mutex_init(struct mutex *lock, const char *name,
                             struct lock_class_key *key);

diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c
index 79d2d76..a70b90d 100644 (file)
--- a/kernel/locking/mutex.c
+++ b/kernel/locking/mutex.c
@@ -537,7 +537,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
                goto skip_wait;
 
        debug_mutex_lock_common(lock, &waiter);
-       debug_mutex_add_waiter(lock, &waiter, task_thread_info(task));
+       debug_mutex_add_waiter(lock, &waiter, task);
 
        /* add waiting tasks to the end of the waitqueue (FIFO): */
        list_add_tail(&waiter.list, &lock->wait_list);
@@ -584,7 +584,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
        }
        __set_task_state(task, TASK_RUNNING);
 
-       mutex_remove_waiter(lock, &waiter, current_thread_info());
+       mutex_remove_waiter(lock, &waiter, task);
        /* set it to 0 if there are no waiters left: */
        if (likely(list_empty(&lock->wait_list)))
                atomic_set(&lock->count, 0);
@@ -605,7 +605,7 @@ skip_wait:
        return 0;
 
 err:
-       mutex_remove_waiter(lock, &waiter, task_thread_info(task));
+       mutex_remove_waiter(lock, &waiter, task);
        spin_unlock_mutex(&lock->wait_lock, flags);
        debug_mutex_free_waiter(&waiter);
        mutex_release(&lock->dep_map, 1, ip);

diff --git a/kernel/locking/mutex.h b/kernel/locking/mutex.h
index 5cda397..a68bae5 100644 (file)
--- a/kernel/locking/mutex.h
+++ b/kernel/locking/mutex.h
@@ -13,7 +13,7 @@
                do { spin_lock(lock); (void)(flags); } while (0)
 #define spin_unlock_mutex(lock, flags) \
                do { spin_unlock(lock); (void)(flags); } while (0)
-#define mutex_remove_waiter(lock, waiter, ti) \
+#define mutex_remove_waiter(lock, waiter, task) \
                __list_del((waiter)->list.prev, (waiter)->list.next)
 
 #ifdef CONFIG_MUTEX_SPIN_ON_OWNER