linux-kernel - Re: [RFC PATCH 1/5] Move task's RCU code to rcupdate.h

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Date:	Thu, 31 Mar 2011 13:31:36 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Jan Beulich <jbeulich@...ell.com>,
	David Howells <dhowells@...hat.com>,
	Alexander van Heukelum <heukelum@...tmail.fm>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Roland McGrath <roland@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Serge Hallyn <serue@...ibm.com>, linux-kernel@...r.kernel.org,
	Christoph Lameter <clameter@....com>,
	Sam Ravnborg <sam@...nborg.org>
Subject: Re: [RFC PATCH 1/5] Move task's RCU code to rcupdate.h

On Mon, 2011-03-28 at 10:58 +0800, Lai Jiangshan wrote:
> +struct task_rcu_struct {
> +#ifdef CONFIG_PREEMPT_RCU
> +       int rcu_read_lock_nesting;
> +       char rcu_read_unlock_special;

Is there a good reason that's a char? It'll leave a 3 byte hole in this
location.

> +       struct list_head rcu_node_entry;
> +#ifdef CONFIG_TREE_PREEMPT_RCU
> +       struct rcu_node *rcu_blocked_node;
> +#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
> +#ifdef CONFIG_RCU_BOOST
> +       struct rt_mutex *rcu_boost_mutex;
> +#endif /* #ifdef CONFIG_RCU_BOOST */
> +#endif /* #ifdef CONFIG_PREEMPT_RCU */
> +}; 
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