linux-kernel - Re: [PATCH 1/2] rcu: introduce list_last_or_null

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Message-ID: <20150528172838.5fa1d813@gandalf.local.home>
Date:	Thu, 28 May 2015 17:28:38 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Dan Streetman <ddstreet@...e.org>
Cc:	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] rcu: introduce list_last_or_null_rcu

On Thu, 28 May 2015 17:19:40 -0400
Dan Streetman <ddstreet@...e.org> wrote:

> >> oh, ok.  how do we do type-generic inline funcs?  return void*?
> >
> > I was hoping that you would tell me.  I use macros in that case.
> 
> ha, if I ever get to the point where i think i know more than you,
> i'll let you know ;-)

static inline struct list_head *
list_last_or_null_rcu(struct list_head *ptr)
{
	struct list_head *entry;
	struct list_head *last;

	for (entry = list_next_rcu(ptr);
	     entry != ptr; entry = list_next_rcu(entry))
		last = __entry;
	if (last != ptr)
		return last;
	return NULL;
}

#define list_last_or_null_entry_rcu(ptr, type, member) \
({ \
	struct list_head *__ptr = list_last_or_null_rcu(ptr); \
	__ptr ? list_entry_rcu(__ptr, type, member) : NULL; \
})

-- Steve
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