linux-kernel - Re: [PATCH 06/12] cgroups: Add res counter common ancestor searching

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Message-Id: <20110906152129.c6136981.akpm@linux-foundation.org>
Date:	Tue, 6 Sep 2011 15:21:29 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Paul Menage <paul@...lmenage.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Aditya Kali <adityakali@...gle.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Kay Sievers <kay.sievers@...y.org>,
	Tim Hockin <thockin@...kin.org>, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH 06/12] cgroups: Add res counter common ancestor
 searching

On Tue,  6 Sep 2011 02:13:00 +0200
Frederic Weisbecker <fweisbec@...il.com> wrote:

> +struct res_counter *
> +res_counter_common_ancestor(struct res_counter *r1, struct res_counter *r2)
> +{
> +	struct res_counter *iter;
> +
> +	while (r1) {
> +		iter = r2;
> +		while (iter) {
> +			if (iter == r1)
> +				return iter;
> +			iter = iter->parent;
> +		}
> +
> +		r1 = r1->parent;
> +	}
> +
> +	return NULL;
> +}

cgroup_mutex, one assumes?
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