linux-kernel - Re: [PATCH] of: Turn of_match_node into a static inline when CONFIG

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Message-ID: <20140211180845.GG841@joshc.qualcomm.com>
Date:	Tue, 11 Feb 2014 12:08:46 -0600
From:	Josh Cartwright <joshc@...eaurora.org>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH] of: Turn of_match_node into a static inline when
 CONFIG_OF isn't set

On Tue, Feb 11, 2014 at 06:20:49PM +0100, Laurent Pinchart wrote:
> On Tuesday 11 February 2014 10:48:26 Josh Cartwright wrote:
> > On Tue, Feb 11, 2014 at 03:55:35PM +0100, Laurent Pinchart wrote:
> > > On Tuesday 11 February 2014 08:41:08 Josh Cartwright wrote:
> > > > On Tue, Feb 11, 2014 at 01:36:51PM +0100, Laurent Pinchart wrote:
[..]
> > I am a bit weary about having an of_match_node() user that both directly
> > dereferences the result (i.e. of_match_node(matches, np)->data) _and_
> > builds when !CONFIG_OF; most likely due to a traumatic childhood event
> > where demons flew out my nose.
>
> I can assign the intermediate value to a variable before dereferencing it and
> drop my of_match_node() patch if it makes everybody happier.

Assuming you also intend to handle the case of_match_node() may return
NULL, or otherwise prevent the execution of this codepath when
!CONFIG_OF, then, yes, that sounds good.

It sure would be convenient if platform_device had a 'const struct
of_device_id *of_id_entry' member similar to the existing struct
platform_device_id one, that was set up during platform device matching.
Most platform_driver users of of_match_node() would simply go away.

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