From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH -v4 2/2] lib, Add lock-less NULL terminated single list
Date: Tue, 16 Nov 2010 12:50:41 +0100
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References: <1289868791-16658-1-git-send-email-ying.huang@intel.com>
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To: Huang Ying <ying.huang@intel.com>
Cc: Len Brown <lenb@kernel.org>, linux-kernel@vger.kernel.org, Andi Kleen <andi@firstfloor.org>, linux-acpi@vger.kernel.org, Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>, Mauro Carvalho Chehab <mchehab@redhat.com>

On Tue, 2010-11-16 at 08:53 +0800, Huang Ying wrote:
> +/**
> + * llist_del_all - delete all entries from lock-less list
> + * @head:      the head of lock-less list to delete all entries
> + *
> + * If list is empty, return NULL, otherwise, delete all entries and
> + * return the pointer to the first entry.
> + */
> +struct llist_node *llist_del_all(struct llist_head *head)
> +{
> +       return xchg(&head->first, NULL);
> +}
> +EXPORT_SYMBOL_GPL(llist_del_all); 

Its not del_all, since it returns the actual list. move or splice might
be better names.