linux-kernel - Re: [PATCH 22/24] HWPOISON: add memory cgroup filter

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Date:	Thu, 03 Dec 2009 10:15:17 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
CC:	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Paul Menage <menage@...gle.com>, Nick Piggin <npiggin@...e.de>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 22/24] HWPOISON: add memory cgroup filter

> +#ifdef	CONFIG_CGROUP_MEM_RES_CTLR_SWAP
> +u32 hwpoison_filter_memcg;
> +static int hwpoison_filter_task(struct page *p)
> +{
> +	struct mem_cgroup *mem;
> +	struct cgroup_subsys_state *css;
> +
> +	if (!hwpoison_filter_memcg)
> +		return 0;
> +
> +	mem = try_get_mem_cgroup_from_page(p);
> +	if (!mem)
> +		return -EINVAL;
> +
> +	css = mem_cgroup_css(mem);
> +	if (!css)
> +		return -EINVAL;
> +

Here, if mem != NULL, then css won't be NULL.

> +	css_put(css);
> +	return 0;
> +}
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