From: Peter Zijlstra <peterz@infradead.org>
To: paulmck@linux.vnet.ibm.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>,
Dipankar Sarma <dipankar@in.ibm.com>, Ingo Molnar <mingo@elte.hu>,
Oleg Nesterov <oleg@tv-sign.ru>,
Al Viro <viro@zeniv.linux.org.uk>,
James Morris <jmorris@namei.org>,
David Howells <dhowells@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [patch 0/9] Fix various __task_cred related invalid RCU assumptions
Date: Mon, 14 Dec 2009 15:30:39 +0100 [thread overview]
Message-ID: <1260801039.4165.323.camel@twins> (raw)
In-Reply-To: <20091214141607.GD7710@linux.vnet.ibm.com>
On Mon, 2009-12-14 at 06:16 -0800, Paul E. McKenney wrote:
> > I think you can use lock_is_held(&rcu_lock_map), except you need to deal
> > with the !debug_locks case, because lockdep stops once debug_locks
> > becomes false, which means lock_is_held() will return rubbish.
>
> OK, so I need to do something like the following, then?
>
> debug_locks ? lock_is_held(&rcu_lock_map) : 1
Depending on what the safe return value is, yeah. If you want an assert
like function, false is usually the safe one.
#define lockdep_assert_held(l) WARN_ON(debug_locks && !lockdep_is_held(l))
is the one in-tree user of this.
next prev parent reply other threads:[~2009-12-14 14:31 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-10 0:52 [patch 0/9] Fix various __task_cred related invalid RCU assumptions Thomas Gleixner
2009-12-10 0:52 ` [patch 1/9] sys: Fix missing rcu protection for __task_cred() access Thomas Gleixner
2009-12-10 1:25 ` Paul E. McKenney
2009-12-10 2:29 ` Tetsuo Handa
2009-12-10 2:43 ` Paul E. McKenney
2009-12-10 14:29 ` Oleg Nesterov
2009-12-10 14:44 ` Thomas Gleixner
2009-12-11 13:45 ` David Howells
2009-12-11 13:52 ` Thomas Gleixner
2009-12-10 14:20 ` Oleg Nesterov
2009-12-10 14:38 ` Thomas Gleixner
2009-12-10 15:08 ` [patch 1/9] sys: Fix missing rcu protection for __task_cred()access Tetsuo Handa
2009-12-10 21:17 ` Thomas Gleixner
2009-12-11 3:25 ` Tetsuo Handa
2010-02-08 12:30 ` [PATCH] Update comment on find_task_by_pid_ns Tetsuo Handa
2010-02-08 13:21 ` Oleg Nesterov
2010-02-08 17:07 ` Thomas Gleixner
2010-02-08 17:16 ` Oleg Nesterov
2010-02-08 21:42 ` Tetsuo Handa
2010-02-09 22:08 ` Andrew Morton
2010-02-10 16:30 ` Serge E. Hallyn
2010-02-10 17:57 ` Andrew Morton
2010-02-10 18:39 ` Thomas Gleixner
2010-02-10 20:18 ` Serge E. Hallyn
2010-02-10 20:30 ` Paul E. McKenney
2010-02-11 1:21 ` Tetsuo Handa
2010-02-11 12:04 ` [PATCH] sys: Fix missing rcu protection for sys_getpriority Tetsuo Handa
2010-02-12 14:22 ` Serge E. Hallyn
2009-12-10 22:09 ` [tip:core/urgent] sys: Fix missing rcu protection for __task_cred() access tip-bot for Thomas Gleixner
2009-12-10 0:52 ` [patch 2/9] fs: Add missing rcu protection for __task_cred() in sys_ioprio_get Thomas Gleixner
2009-12-10 0:53 ` [patch 3/9] proc: Add missing rcu protection for __task_cred() in task_sig() Thomas Gleixner
2009-12-10 0:53 ` [patch 4/9] oom: Add missing rcu protection of __task_cred() in dump_tasks Thomas Gleixner
2009-12-10 0:53 ` Thomas Gleixner
2009-12-10 1:57 ` KOSAKI Motohiro
2009-12-10 1:57 ` KOSAKI Motohiro
2009-12-10 0:53 ` [patch 5/9] security: Use get_task_cred() in keyctl_session_to_parent() Thomas Gleixner
2009-12-10 2:45 ` Paul E. McKenney
2009-12-10 0:53 ` [patch 6/9] signal: Fix racy access to __task_cred in kill_pid_info_as_uid() Thomas Gleixner
2009-12-10 15:11 ` Oleg Nesterov
2009-12-10 22:09 ` [tip:core/urgent] " tip-bot for Thomas Gleixner
2009-12-10 0:53 ` [patch 7/9] signals: Fix more rcu assumptions Thomas Gleixner
2009-12-10 14:34 ` Oleg Nesterov
2009-12-10 14:45 ` Thomas Gleixner
2009-12-11 13:59 ` David Howells
2009-12-10 22:09 ` [tip:core/urgent] " tip-bot for Thomas Gleixner
2009-12-10 0:53 ` [patch 8/9] Documentation: Fix invalid " Thomas Gleixner
2009-12-10 23:55 ` Vegard Nossum
2009-12-11 21:28 ` Arnd Bergmann
2009-12-11 22:01 ` Paul E. McKenney
2009-12-10 0:53 ` [patch 9/9] security: Fix invalid rcu assumptions in comments Thomas Gleixner
2009-12-10 2:28 ` [patch 0/9] Fix various __task_cred related invalid RCU assumptions Paul E. McKenney
2009-12-10 3:15 ` Linus Torvalds
2009-12-10 5:13 ` Peter Zijlstra
2009-12-10 5:34 ` Paul E. McKenney
2009-12-13 18:56 ` Peter Zijlstra
2009-12-14 1:53 ` Paul E. McKenney
2009-12-14 10:17 ` Peter Zijlstra
2009-12-14 14:16 ` Paul E. McKenney
2009-12-14 14:30 ` Peter Zijlstra [this message]
2009-12-15 1:23 ` Paul E. McKenney
2009-12-11 13:39 ` David Howells
2009-12-11 16:35 ` Paul E. McKenney
2009-12-11 13:41 ` [patch 1/9] sys: Fix missing rcu protection for __task_cred() access David Howells
2009-12-11 13:46 ` [patch 2/9] fs: Add missing rcu protection for __task_cred() in sys_ioprio_get David Howells
2009-12-11 13:46 ` [patch 3/9] proc: Add missing rcu protection for __task_cred() in task_sig() David Howells
2009-12-11 13:49 ` [patch 4/9] oom: Add missing rcu protection of __task_cred() in dump_tasks David Howells
2009-12-11 13:49 ` David Howells
2009-12-11 13:52 ` Thomas Gleixner
2009-12-11 13:52 ` Thomas Gleixner
2009-12-11 13:52 ` [patch 5/9] security: Use get_task_cred() in keyctl_session_to_parent() David Howells
2009-12-11 13:53 ` [patch 6/9] signal: Fix racy access to __task_cred in kill_pid_info_as_uid() David Howells
2009-12-11 14:00 ` [patch 8/9] Documentation: Fix invalid rcu assumptions David Howells
2009-12-11 16:07 ` Linus Torvalds
2009-12-11 16:37 ` Paul E. McKenney
2009-12-11 18:08 ` Thomas Gleixner
2009-12-11 14:01 ` [patch 9/9] security: Fix invalid rcu assumptions in comments David Howells
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