From: Peter Zijlstra <peterz@infradead.org>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org, mingo@elte.hu,
laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca,
josh@joshtriplett.org, dvhltc@us.ibm.com, niv@us.ibm.com,
tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org,
Valdis.Kletnieks@vt.edu, dhowells@redhat.com
Subject: Re: [PATCH tip/core/rcu 06/13] sched: use lockdep-based checking on rcu_dereference()
Date: Sun, 14 Feb 2010 11:12:12 +0100 [thread overview]
Message-ID: <1266142332.5273.415.camel@laptop> (raw)
In-Reply-To: <1265932839-25899-6-git-send-email-paulmck@linux.vnet.ibm.com>
On Thu, 2010-02-11 at 16:00 -0800, Paul E. McKenney wrote:
> + first = rcu_dereference_check(pid->tasks[type].first, rcu_read_lock_held() || lockdep_is_held(&tasklist_lock));
> if (first)
> result = hlist_entry(first, struct task_struct, pids[(type)].node);
> }
I've seen that particular combination a few times in this patch, would
it make sense to create rcu_dereference_task()?
> diff --git a/kernel/sched.c b/kernel/sched.c
> index c535cc4..ad419d9 100644
> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -645,6 +645,11 @@ static inline int cpu_of(struct rq *rq)
> #endif
> }
>
> +#define for_each_domain_rd(p) \
> + rcu_dereference_check((p), \
> + rcu_read_lock_sched_held() || \
> + lockdep_is_held(&sched_domains_mutex))
> +
Would rcu_dereference_rd() not be a better name?
next prev parent reply other threads:[~2010-02-14 10:13 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-12 0:00 [PATCH tip/core/rcu 0/13] rcu: add lockdep checking, doc update, dyntick GP acceleration Paul E. McKenney
2010-02-12 0:00 ` [PATCH tip/core/rcu 01/13] rcu: introduce lockdep-based checking to RCU read-side primitives Paul E. McKenney
2010-02-12 0:00 ` [PATCH tip/core/rcu 02/13] rcu: add lockdep-enabled variants of rcu_dereference() Paul E. McKenney
2010-02-12 4:13 ` Eric Dumazet
2010-02-12 0:00 ` [PATCH tip/core/rcu 03/13] rcu: integrate rcu_dereference_check() message into lockdep Paul E. McKenney
2010-02-12 0:00 ` [PATCH tip/core/rcu 04/13] rcu: disable lockdep checking in RCU list-traversal primitives Paul E. McKenney
2010-02-12 0:00 ` [PATCH tip/core/rcu 05/13] net: add checking to rcu_dereference() primitives Paul E. McKenney
2010-02-12 4:15 ` Eric Dumazet
2010-02-14 8:23 ` Ingo Molnar
2010-02-15 7:18 ` David Miller
2010-02-14 8:34 ` Michał Mirosław
2010-02-14 8:50 ` Eric Dumazet
2010-02-12 0:00 ` [PATCH tip/core/rcu 06/13] sched: use lockdep-based checking on rcu_dereference() Paul E. McKenney
2010-02-14 10:12 ` Peter Zijlstra [this message]
2010-02-14 17:48 ` Paul E. McKenney
2010-02-12 0:00 ` [PATCH tip/core/rcu 07/13] vfs: apply lockdep-based checking to rcu_dereference() uses Paul E. McKenney
2010-02-14 10:12 ` Peter Zijlstra
2010-02-14 17:37 ` Paul E. McKenney
2010-02-12 0:00 ` [PATCH tip/core/rcu 08/13] radix-tree: disable RCU lockdep checking in radix tree Paul E. McKenney
2010-02-12 0:00 ` [PATCH tip/core/rcu 09/13] idr: apply lockdep-based diagnostics to rcu_dereference() uses Paul E. McKenney
2010-02-12 0:00 ` [PATCH tip/core/rcu 10/13] security: apply lockdep-based checking " Paul E. McKenney
2010-02-12 0:00 ` [PATCH tip/core/rcu 11/13] rcu: documentation update for CONFIG_PROVE_RCU Paul E. McKenney
2010-02-12 0:00 ` [PATCH tip/core/rcu 12/13] rcu: fix citation of Mathieu's dissertation Paul E. McKenney
2010-02-12 0:00 ` [PATCH tip/core/rcu 13/13] rcu: accelerate grace period if last non-dynticked CPU Paul E. McKenney
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