* [PATCH] lockdep: Include all lock classes in all_lock_classes
@ 2008-02-01 15:21 Dale Farnsworth
2008-02-03 15:21 ` Peter Zijlstra
0 siblings, 1 reply; 4+ messages in thread
From: Dale Farnsworth @ 2008-02-01 15:21 UTC (permalink / raw)
To: Ingo Molnar, Peter Zijlstra; +Cc: linux-kernel
Add each lock class to the all_lock_classes list when it is
first registered.
Previously, lock classes were added to all_lock_classes when
the lock class was first used. Since one of the uses of the
list is to find unused locks, this didn't work well.
Signed-off-by: Dale Farnsworth <dale@farnsworth.org>
---
kernel/lockdep.c | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 723bd9f..e630127 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -779,6 +779,10 @@ register_lock_class(struct lockdep_map *lock, unsigned int subclass, int force)
* parallel walking of the hash-list safe:
*/
list_add_tail_rcu(&class->hash_entry, hash_head);
+ /*
+ * Add it to the global list of classes:
+ */
+ list_add_tail_rcu(&class->lock_entry, &all_lock_classes);
if (verbose(class)) {
graph_unlock();
@@ -2282,10 +2286,6 @@ static int mark_lock(struct task_struct *curr, struct held_lock *this,
return 0;
break;
case LOCK_USED:
- /*
- * Add it to the global list of classes:
- */
- list_add_tail_rcu(&this->class->lock_entry, &all_lock_classes);
debug_atomic_dec(&nr_unused_locks);
break;
default:
--
1.5.3.4
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] lockdep: Include all lock classes in all_lock_classes
2008-02-01 15:21 [PATCH] lockdep: Include all lock classes in all_lock_classes Dale Farnsworth
@ 2008-02-03 15:21 ` Peter Zijlstra
2008-02-03 19:47 ` Dale Farnsworth
0 siblings, 1 reply; 4+ messages in thread
From: Peter Zijlstra @ 2008-02-03 15:21 UTC (permalink / raw)
To: Dale Farnsworth; +Cc: Ingo Molnar, linux-kernel
On Fri, 2008-02-01 at 08:21 -0700, Dale Farnsworth wrote:
> Add each lock class to the all_lock_classes list when it is
> first registered.
>
> Previously, lock classes were added to all_lock_classes when
> the lock class was first used.
> Since one of the uses of the list is to find unused locks, this didn't
> work well.
You mean in lockdep_proc.c to generate the statistics?
Another potential issue might be count_matching_names() generating a
wrong class version.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] lockdep: Include all lock classes in all_lock_classes
2008-02-03 15:21 ` Peter Zijlstra
@ 2008-02-03 19:47 ` Dale Farnsworth
2008-02-03 19:57 ` Peter Zijlstra
0 siblings, 1 reply; 4+ messages in thread
From: Dale Farnsworth @ 2008-02-03 19:47 UTC (permalink / raw)
To: Peter Zijlstra; +Cc: Ingo Molnar, linux-kernel
On Sun, Feb 03, 2008 at 04:21:02PM +0100, Peter Zijlstra wrote:
> On Fri, 2008-02-01 at 08:21 -0700, Dale Farnsworth wrote:
> > Add each lock class to the all_lock_classes list when it is
> > first registered.
> >
> > Previously, lock classes were added to all_lock_classes when
> > the lock class was first used.
>
> > Since one of the uses of the list is to find unused locks, this didn't
> > work well.
>
> You mean in lockdep_proc.c to generate the statistics?
Yes, that's where I noticed it. On my platform, there was one
unused lock which was missed.
>
> Another potential issue might be count_matching_names() generating a
> wrong class version.
I haven't looked into that issue yet.
-Dale
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] lockdep: Include all lock classes in all_lock_classes
2008-02-03 19:47 ` Dale Farnsworth
@ 2008-02-03 19:57 ` Peter Zijlstra
0 siblings, 0 replies; 4+ messages in thread
From: Peter Zijlstra @ 2008-02-03 19:57 UTC (permalink / raw)
To: Dale Farnsworth; +Cc: Ingo Molnar, linux-kernel
On Sun, 2008-02-03 at 12:47 -0700, Dale Farnsworth wrote:
> On Sun, Feb 03, 2008 at 04:21:02PM +0100, Peter Zijlstra wrote:
> > On Fri, 2008-02-01 at 08:21 -0700, Dale Farnsworth wrote:
> > > Add each lock class to the all_lock_classes list when it is
> > > first registered.
> > >
> > > Previously, lock classes were added to all_lock_classes when
> > > the lock class was first used.
> >
> > > Since one of the uses of the list is to find unused locks, this didn't
> > > work well.
> >
> > You mean in lockdep_proc.c to generate the statistics?
>
> Yes, that's where I noticed it. On my platform, there was one
> unused lock which was missed.
OK, I'll clarify the description and take the patch. Thanks!
^ permalink raw reply [flat|nested] 4+ messages in thread
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2008-02-01 15:21 [PATCH] lockdep: Include all lock classes in all_lock_classes Dale Farnsworth
2008-02-03 15:21 ` Peter Zijlstra
2008-02-03 19:47 ` Dale Farnsworth
2008-02-03 19:57 ` Peter Zijlstra
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