linux-kernel - Re: [PATCH] SELinux fixups needed for preemptable RCU from -rt

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Date:	Mon, 21 Apr 2008 20:54:51 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
cc:	linux-kernel@...r.kernel.org, mingo@...e.hu,
	akpm@...ux-foundation.org, dwalker@...sta.com,
	sdietrich@...ell.com, dvhltc@...ibm.com, niv@...ibm.com
Subject: Re: [PATCH] SELinux fixups needed for preemptable RCU from -rt


On Mon, 21 Apr 2008, Paul E. McKenney wrote:
> @@ -807,8 +810,14 @@ int avc_ss_reset(u32 seqno)
>
>  	for (i = 0; i < AVC_CACHE_SLOTS; i++) {
>  		spin_lock_irqsave(&avc_cache.slots_lock[i], flag);
> +		/*
> +		 * On -rt the outer spinlock does not prevent RCU
> +		 * from being performed:

I would suggest to change this comment to "With preemptible RCU" from
"On -rt".

-- Steve

> +		 */
> +		rcu_read_lock();
>  		list_for_each_entry(node, &avc_cache.slots[i], list)
>  			avc_node_delete(node);
> +		rcu_read_unlock();
>  		spin_unlock_irqrestore(&avc_cache.slots_lock[i], flag);
>  	}
>
5A
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