linux-kernel - Re: [RFC/PATCH 2/5] rt: list

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Message-ID: <Pine.LNX.4.58.0710231005540.29506@gandalf.stny.rr.com>
Date:	Tue, 23 Oct 2007 10:08:24 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
cc:	linux-kernel@...r.kernel.org, Daniel Walker <dwalker@...sta.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Gregory Haskins <ghaskins@...ell.com>,
	Oleg Nesterov <oleg@...sign.ru>
Subject: Re: [RFC/PATCH 2/5] rt: list_splice2



--
On Tue, 23 Oct 2007, Peter Zijlstra wrote:
>
>  /**
> @@ -341,7 +341,13 @@ static inline void __list_splice(struct
>  static inline void list_splice(struct list_head *list, struct list_head *head)
>  {
>  	if (!list_empty(list))
> -		__list_splice(list, head);
> +		__list_splice(list, head, head->next);
> +}
> +


> Index: linux-2.6/lib/lock_list.c
> ===================================================================
> --- linux-2.6.orig/lib/lock_list.c
> +++ linux-2.6/lib/lock_list.c
> @@ -128,7 +128,7 @@ void lock_list_splice_init(struct lock_l
>  	lock = __lock_list_reverse(list);
>  	if (!list_empty(&list->head)) {
>  		spin_lock_nested(&head->lock, LOCK_LIST_NESTING_NEXT);
> -		__list_splice(&list->head, &head->head);
> +		__list_splice(&list->head, &head->head, head->head.next);

Can't this just now be list_splice and not __list_splice?

Yes it tests for list_empty again, but that should (hopefully) be
optimized out.

-- Steve

>  		INIT_LIST_HEAD(&list->head);
>  		spin_unlock(&head->lock);
>  	}
>
> --
>
>
>
-
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