linux-kernel - Re: [PATCH 6/11] ksm: remove old stable nodes more thoroughly

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Message-Id: <20130128154407.16a623a4.akpm@linux-foundation.org>
Date:	Mon, 28 Jan 2013 15:44:07 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Petr Holasek <pholasek@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Izik Eidus <izik.eidus@...ellosystems.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 6/11] ksm: remove old stable nodes more thoroughly

On Fri, 25 Jan 2013 18:01:59 -0800 (PST)
Hugh Dickins <hughd@...gle.com> wrote:

> +static int remove_all_stable_nodes(void)
> +{
> +	struct stable_node *stable_node;
> +	int nid;
> +	int err = 0;
> +
> +	for (nid = 0; nid < nr_node_ids; nid++) {
> +		while (root_stable_tree[nid].rb_node) {
> +			stable_node = rb_entry(root_stable_tree[nid].rb_node,
> +						struct stable_node, node);
> +			if (remove_stable_node(stable_node)) {
> +				err = -EBUSY;

It's a bit rude to overwrite remove_stable_node()'s return value.

> +				break;	/* proceed to next nid */
> +			}
> +			cond_resched();

Why is this here?

> +		}
> +	}
> +	return err;
> +}

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