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Date: Sat, 07 Aug 2010 20:37:00 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: xiaosuo@...il.com
Cc: paulmck@...ux.vnet.ibm.com, therbert@...gle.com,
netdev@...r.kernel.org
Subject: Re: [PATCH] net: disable preemption before call smp_processor_id()
From: Changli Gao <xiaosuo@...il.com>
Date: Sat, 7 Aug 2010 17:26:02 +0800
> Although netif_rx() isn't expected to be called in process context with
> preemption enabled, it'd better handle this case. And this is why get_cpu()
> is used in the non-RPS #ifdef branch. If tree RCU is selected,
> rcu_read_lock() won't disable preemption, so preempt_disable() should be
> called explictly.
>
> Signed-off-by: Changli Gao <xiaosuo@...il.com>
Applied, thanks Changli.
Paul, perhaps the comment above rcu_read_lock()'s definition should
be updated in rcupdate.h? It says blocking is not allowed inside
of a read side critical section, but obviously with tree-rcu that
is not the case.
Either we should add a mention of tree-rcu's semantics or just remote
this part of the comment altogether.
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