linux-kernel - Re: [PATCH V4 1/3] of: introduce for_each_matching_node_and

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Date:	Wed, 21 Nov 2012 09:53:20 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	John Stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Olof Johansson <olof@...om.net>,
	Josh Cartwright <josh.cartwright@...il.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org, Stephen Warren <swarren@...dia.com>
Subject: Re: [PATCH V4 1/3] of: introduce for_each_matching_node_and_match()

On Tuesday 20 November 2012, Stephen Warren wrote:
> However, this results in iterating over table twice; the second time
> inside of_match_node(). The implementation of for_each_matching_node()
> already found the match, so this is redundant. Invent new function
> of_find_matching_node_and_match() and macro
> for_each_matching_node_and_match() to remove the double iteration,
> thus transforming the above code to:
> 
>     for_each_matching_node_and_match(np, table, &match)
> 
> Signed-off-by: Stephen Warren <swarren@...dia.com>

This look useful, but I wonder if the interface would make more sense if you
make the last argument to the macro a normal pointer, rather than a
pointer-to-pointer. You can take the reference as part of the macro.

	Arnd
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