linux-kernel - Re: [PATCH 02/12] cgroups: New resource counter inheritance API

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Message-Id: <20110906151747.26aa4fd2.akpm@linux-foundation.org>
Date:	Tue, 6 Sep 2011 15:17:47 -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 02/12] cgroups: New resource counter inheritance API

On Tue,  6 Sep 2011 02:12:56 +0200
Frederic Weisbecker <fweisbec@...il.com> wrote:

> +void res_counter_inherit(struct res_counter *counter, int member)
> +{
> +	struct res_counter *parent;
> +	unsigned long long val;
> +
> +	parent = counter->parent;
> +	if (parent) {
> +		val = res_counter_read_u64(parent, member);
> +		res_counter_write_u64(counter, member, val);
> +	}
> +}

What locking protects the read-modify-write?  If none, please fix,
otherwise please document it.

All of kernel/res_counter.c is charmingly undocumented.
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