From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Yong Zhang <yong.zhang0@gmail.com>
Cc: Vegard Nossum <vegard.nossum@gmail.com>,
linux-kernel@vger.kernel.org, sergey.senozhatsky@gmail.com,
bp@alien8.de, Ingo Molnar <mingo@elte.hu>,
Tejun Heo <tj@kernel.org>, David Rientjes <rientjes@google.com>,
casteyde.christian@free.fr
Subject: Re: [PATCH 1/4] lockdep: lock_set_subclass() fix
Date: Tue, 08 Nov 2011 08:56:55 +0100 [thread overview]
Message-ID: <1320739015.2244.0.camel@twins> (raw)
In-Reply-To: <20111108025847.GB11439@zhy>
On Tue, 2011-11-08 at 10:58 +0800, Yong Zhang wrote:
> > struct lockdep_map {
> > + const char *name;
> > struct lock_class_key *key;
> > struct lock_class *class_cache[NR_LOCKDEP_CACHING_CLASSES];
> > - const char *name;
> > #ifdef CONFIG_LOCK_STAT
> > int cpu;
> > unsigned long ip;
> > diff --git a/kernel/lockdep.c b/kernel/lockdep.c
> > index e69434b..81855cf 100644
> > --- a/kernel/lockdep.c
> > +++ b/kernel/lockdep.c
> > @@ -2948,7 +2948,8 @@ static int mark_lock(struct task_struct *curr, struct held_lock *this,
> > void lockdep_init_map(struct lockdep_map *lock, const char *name,
> > struct lock_class_key *key, int subclass)
> > {
> > - memset(lock, 0, sizeof(*lock));
> > + kmemcheck_mark_initialized(lock, 2*sizeof(void *));
> > + memset(&lock->class_cache[0], 0, sizeof(*lock)-2*sizeof(void *));
>
> That means ->key have chance to be 0 at some time, right?
How? We only memset from class_cache onwards, leaving name and key
untouched.
next prev parent reply other threads:[~2011-11-08 7:57 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-04 9:26 [PATCH 0/4] patches to cure race in lock_set_class() Yong Zhang
2011-11-04 9:26 ` [PATCH 1/4] lockdep: lock_set_subclass() fix Yong Zhang
2011-11-07 12:34 ` Peter Zijlstra
2011-11-07 13:31 ` Yong Zhang
2011-11-07 14:03 ` Tejun Heo
2011-11-07 13:54 ` Borislav Petkov
2011-11-07 15:28 ` Vegard Nossum
2011-11-07 16:10 ` Peter Zijlstra
2011-11-07 16:21 ` Tejun Heo
2011-11-07 16:26 ` Peter Zijlstra
2011-11-08 2:58 ` Yong Zhang
2011-11-08 3:02 ` Yong Zhang
2011-11-08 7:56 ` Peter Zijlstra [this message]
2011-11-08 8:14 ` Yong Zhang
2011-11-08 8:46 ` Peter Zijlstra
2011-11-08 9:07 ` Yong Zhang
2011-11-08 9:37 ` Yong Zhang
2011-11-08 9:40 ` Peter Zijlstra
2011-11-09 8:04 ` [PATCH 1/2] lockdep: kmemcheck: annotate ->lock in lockdep_init_map() Yong Zhang
2011-11-09 8:07 ` [PATCH 2/2] lockdep: always try to set ->class_cache in register_lock_class() lockdep_init_map() Yong Zhang
2011-11-18 23:39 ` [tip:core/locking] lockdep: Always " tip-bot for Yong Zhang
2011-12-06 9:39 ` [tip:core/locking] lockdep, kmemcheck: Annotate ->lock in lockdep_init_map() tip-bot for Yong Zhang
2011-12-06 19:56 ` David Rientjes
2011-12-06 20:14 ` [tip:perf/urgent] " tip-bot for Yong Zhang
2011-11-08 2:22 ` [PATCH 1/4] lockdep: lock_set_subclass() fix Yong Zhang
2011-11-04 9:26 ` [RFC PATCH 2/4] lockdep: Let register_lock_class() can be called with/without graph_lock Yong Zhang
2011-11-04 9:26 ` [RFC PATCH 3/4] lockdep: split lockdep_init_map() Yong Zhang
2011-11-04 9:26 ` [RFC PATCH 4/4] lockdep: fix race condition in __lock_set_class() Yong Zhang
2011-11-07 12:30 ` Peter Zijlstra
2011-11-07 13:26 ` Yong Zhang
2011-11-06 11:52 ` [PATCH 0/4] patches to cure race in lock_set_class() Borislav Petkov
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