linux-kernel - Re: [TOMOYO 05/15](repost) Domain transition handler functions.

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Date:	Wed, 3 Oct 2007 22:59:22 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	kaigai@...gai.gr.jp
Cc:	jmorris@...ei.org, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, chrisw@...s-sol.org
Subject: Re: [TOMOYO 05/15](repost) Domain transition handler functions.

Hello.

KaiGai Kohei wrote:
> If so, you can apply RCU instead to avoid read lock
> when scanning the list, like:
> 
> rcu_read_lock();
> list_for_each_entry(...) {
>      ....
> }
> rcu_read_unlock();

Can I sleep between rcu_read_lock() and rcu_read_unlock() ?
As far as I saw, rcu_read_lock() makes in_atomic() true, so I think I can't sleep.

If I use RCU, I have to give up " [TOMOYO 13/15] Conditional permission support"
because tmy_check_condition() can sleep.

Regards.

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