linux-kernel - Re: [PATCH 1/5] x86: Get pg_data

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Message-ID: <50AC6AA3.8000806@jp.fujitsu.com>
Date:	Wed, 21 Nov 2012 14:46:11 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	Tang Chen <tangchen@...fujitsu.com>
CC:	<wency@...fujitsu.com>, <linfeng@...fujitsu.com>,
	<rob@...dley.net>, <akpm@...ux-foundation.org>,
	<laijs@...fujitsu.com>, <jiang.liu@...wei.com>,
	<kosaki.motohiro@...fujitsu.com>, <minchan.kim@...il.com>,
	<mgorman@...e.de>, <rientjes@...gle.com>, <yinghai@...nel.org>,
	<rusty@...tcorp.com.au>, <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>, <linux-doc@...r.kernel.org>
Subject: Re: [PATCH 1/5] x86: Get pg_data_t's memory from other node

Hi Tang,

2012/11/19 23:27, Tang Chen wrote:
> From: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
> 
> If system can create movable node which all memory of the
> node is allocated as ZONE_MOVABLE, setup_node_data() cannot
> allocate memory for the node's pg_data_t.
> So when memblock_alloc_nid() fails, setup_node_data() retries
> memblock_alloc().
> 
> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
> Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
> Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
> Reviewed-by: Wen Congyang <wency@...fujitsu.com>
> Tested-by: Lin Feng <linfeng@...fujitsu.com>
> ---
>   arch/x86/mm/numa.c |    9 +++++++--
>   1 files changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
> index 2d125be..ae2e76e 100644
> --- a/arch/x86/mm/numa.c
> +++ b/arch/x86/mm/numa.c
> @@ -224,9 +224,14 @@ static void __init setup_node_data(int nid, u64 start, u64 end)
>   	} else {
>   		nd_pa = memblock_alloc_nid(nd_size, SMP_CACHE_BYTES, nid);
>   		if (!nd_pa) {
> -			pr_err("Cannot find %zu bytes in node %d\n",

> +			printk(KERN_WARNING "Cannot find %zu bytes in node %d\n",
>   			       nd_size, nid)

Please change to use pr_warn().

Thanks,
Yasuaki Ishimatsu

> -			return;
> +			nd_pa = memblock_alloc(nd_size, SMP_CACHE_BYTES);
> +			if (!nd_pa) {
> +				pr_err("Cannot find %zu bytes in other node\n",
> +				       nd_size);
> +				return;
> +			}
>   		}
>   		nd = __va(nd_pa);
>   	}
> 


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