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

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Date:	Tue, 19 Feb 2008 23:50:35 -0800
From:	Yinghai Lu <Yinghai.Lu@....COM>
To:	Ingo Molnar <mingo@...e.hu>
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

On Tuesday 19 February 2008 10:52:30 pm Ingo Molnar wrote:
> 
> * 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.

sound good idea to update the dev_to_node to make sure it will return -1 or the one is online.

Will send updated one.

YH
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