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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2008-12-04 09:00:17 +0100
committerIngo Molnar <mingo@elte.hu>2008-12-04 10:08:18 +0100
commit00ef9f7348dfd2fc223ec42aceb30836e86b367f (patch)
tree14c33d878bec717179a6916232e118dbfbf7d65f /kernel/lockdep.c
parentcb9c34e6d090d376b77becaa5d29a65dec7f4272 (diff)
downloadop-kernel-dev-00ef9f7348dfd2fc223ec42aceb30836e86b367f.zip
op-kernel-dev-00ef9f7348dfd2fc223ec42aceb30836e86b367f.tar.gz
lockdep: change a held lock's class
Impact: introduce new lockdep API Allow to change a held lock's class. Basically the same as the existing code to change a subclass therefore reuse all that. The XFS code will be able to use this to annotate their inode locking. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/lockdep.c')
-rw-r--r--kernel/lockdep.c24
1 files changed, 9 insertions, 15 deletions
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 90f3fb6..4fa6eeb 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -291,14 +291,12 @@ void lockdep_off(void)
{
current->lockdep_recursion++;
}
-
EXPORT_SYMBOL(lockdep_off);
void lockdep_on(void)
{
current->lockdep_recursion--;
}
-
EXPORT_SYMBOL(lockdep_on);
/*
@@ -2513,7 +2511,6 @@ void lockdep_init_map(struct lockdep_map *lock, const char *name,
if (subclass)
register_lock_class(lock, subclass, 1);
}
-
EXPORT_SYMBOL_GPL(lockdep_init_map);
/*
@@ -2694,8 +2691,9 @@ static int check_unlock(struct task_struct *curr, struct lockdep_map *lock,
}
static int
-__lock_set_subclass(struct lockdep_map *lock,
- unsigned int subclass, unsigned long ip)
+__lock_set_class(struct lockdep_map *lock, const char *name,
+ struct lock_class_key *key, unsigned int subclass,
+ unsigned long ip)
{
struct task_struct *curr = current;
struct held_lock *hlock, *prev_hlock;
@@ -2722,6 +2720,7 @@ __lock_set_subclass(struct lockdep_map *lock,
return print_unlock_inbalance_bug(curr, lock, ip);
found_it:
+ lockdep_init_map(lock, name, key, 0);
class = register_lock_class(lock, subclass, 0);
hlock->class_idx = class - lock_classes + 1;
@@ -2906,9 +2905,9 @@ static void check_flags(unsigned long flags)
#endif
}
-void
-lock_set_subclass(struct lockdep_map *lock,
- unsigned int subclass, unsigned long ip)
+void lock_set_class(struct lockdep_map *lock, const char *name,
+ struct lock_class_key *key, unsigned int subclass,
+ unsigned long ip)
{
unsigned long flags;
@@ -2918,13 +2917,12 @@ lock_set_subclass(struct lockdep_map *lock,
raw_local_irq_save(flags);
current->lockdep_recursion = 1;
check_flags(flags);
- if (__lock_set_subclass(lock, subclass, ip))
+ if (__lock_set_class(lock, name, key, subclass, ip))
check_chain_key(current);
current->lockdep_recursion = 0;
raw_local_irq_restore(flags);
}
-
-EXPORT_SYMBOL_GPL(lock_set_subclass);
+EXPORT_SYMBOL_GPL(lock_set_class);
/*
* We are not always called with irqs disabled - do that here,
@@ -2948,7 +2946,6 @@ void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
current->lockdep_recursion = 0;
raw_local_irq_restore(flags);
}
-
EXPORT_SYMBOL_GPL(lock_acquire);
void lock_release(struct lockdep_map *lock, int nested,
@@ -2966,7 +2963,6 @@ void lock_release(struct lockdep_map *lock, int nested,
current->lockdep_recursion = 0;
raw_local_irq_restore(flags);
}
-
EXPORT_SYMBOL_GPL(lock_release);
#ifdef CONFIG_LOCK_STAT
@@ -3451,7 +3447,6 @@ retry:
if (unlock)
read_unlock(&tasklist_lock);
}
-
EXPORT_SYMBOL_GPL(debug_show_all_locks);
/*
@@ -3472,7 +3467,6 @@ void debug_show_held_locks(struct task_struct *task)
{
__debug_show_held_locks(task);
}
-
EXPORT_SYMBOL_GPL(debug_show_held_locks);
void lockdep_sys_exit(void)
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