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

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Message-ID: <CALZtONCRLj53dCkdzU3vecMy_z0V7TwDFfqsb2HWmX=9VduvDg@mail.gmail.com>
Date:	Thu, 28 May 2015 17:30:37 -0400
From:	Dan Streetman <ddstreet@...e.org>
To:	Steven Rostedt <rostedt@...dmis.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, May 28, 2015 at 5:28 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> 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; \
> })

well sure :-)

however, the rcu list function currently doesn't include "entry" in
the function name, but returns the list entry (not the list_head).
that could be changed, but all callers would need to change, too.

>
> -- Steve
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