linux-kernel - Re: [PATCH] mm: fix dma_poor

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Message-ID: <20080220065230.GG7493@elte.hu>
Date:	Wed, 20 Feb 2008 07:52:30 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <Yinghai.Lu@....COM>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] mm: fix dma_poor_create


* Yinghai Lu <Yinghai.Lu@....COM> wrote:

> dev_to_node could return node that without RAM. So check it before use 
> it in kmalloc_node

> -	retval = kmalloc_node(sizeof(*retval), GFP_KERNEL, dev_to_node(dev));
> +	node = dev_to_node(dev);
> +	if (node == -1 || !node_online(node))
> +		node = numa_node_id();
> +
> +	retval = kmalloc_node(sizeof(*retval), GFP_KERNEL, node);

so this is about not crashing during bootup on nodes that have CPUs but 
which have no node-specific memory attached, right?

Shouldnt kmalloc_node() be made more robust instead? I.e. push the same 
code into kmalloc_node() - and make sure it will allocate _something_? 
That would probably also fix a similar bug in net/core/skbuff.c's 
__netdev_alloc_skb(), which too passes a dev_to_node() result to an 
allocator.

	Ingo
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