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Date: Sat, 07 Aug 2010 22:25:43 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: paulmck@...ux.vnet.ibm.com
Cc: xiaosuo@...il.com, therbert@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH] net: disable preemption before call smp_processor_id()
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Date: Sat, 7 Aug 2010 21:57:51 -0700
> If I cover preemptible RCU's semantics, a first cut comes out like this:
>
> * In non-preemptible RCU implementations (TREE_RCU and TINY_RCU), it
> * is illegal to block while in an RCU read-side critical section. In
> * preemptible RCU implementations (TREE_PREEMPT_RCU and TINY_PREEMPT_RCU)
> * in CONFIG_PREEMPT kernel builds, RCU read-side critical sections may
> * be preempted, but explicit blocking is illegal. Finally, in preemptible
> * RCU implementations in real-time (CONFIG_PREEMPT_RT) kernel builds,
> * RCU read-side critical sections may be preempted and they may also
> * block, but only when acquiring spinlocks that are subject to priority
> * inheritance.
>
> Does that seem reasonable?
Sounds good to me.
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