linux-kernel - Re: [PATCH 2/3] add dev_to

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Date:	Mon, 30 Oct 2006 14:33:57 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	hch@....de
Cc:	linux-kernel@...r.kernel.org, netdev@....sgi.com,
	linux-mm@...ck.org
Subject: Re: [PATCH 2/3] add dev_to_node()

From: Christoph Hellwig <hch@....de>
Date: Mon, 30 Oct 2006 15:15:01 +0100

> Davem suggested to get the node-affinity information directly from
> struct device instead of having the caller extreact it from the
> pci_dev.  This patch adds dev_to_node() to the topology API for that.
> The implementation is rather ugly as we need to compare the bus
> operations which we can't do inline in a header without pulling all
> kinds of mess in.
> 
> Thus provide an out of line dev_to_node for ppc and let everyone else
> use the dummy variant in asm-generic.h for now.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

It may be a bit much to be calling all the way through up to the PCI
layer just to pluck out a simple integer, don't you think?  The PCI
bus pointer comparison is just a symptom of how silly this is.

Especially since this will be used for every packet allocation a
device makes.

So, please add some sanity to this situation and just put the node
into the generic struct device. :-)
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