netdev - Re: [PATCH] phylib: make mdio-gpio work without OF (v2)

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Date:	Tue, 4 Nov 2008 21:45:40 -0700
From:	David Brownell <david-b@...bell.net>
To:	"Mike Frysinger" <vapier.adi@...il.com>
Cc:	"Grant Likely" <grant.likely@...retlab.ca>,
	"Paulius Zaleckas" <paulius.zaleckas@...tonika.lt>,
	netdev@...r.kernel.org, linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-embedded@...r.kernel.org,
	"Laurent Pinchart" <laurentp@...-semaphore.com>
Subject: Re: [PATCH] phylib: make mdio-gpio work without OF (v2)

On Tuesday 04 November 2008, Mike Frysinger wrote:
> > That's generally the preferred way to handle #ifdeffery.
> > But I could imagine OF isn't (yet?) set up to handle it.
> 
> i agree completely with the inclination to do it all in C as you've
> suggested and let the compiler do dead code elimination, but that only
> works if the functions in question are defined everywhere (in other
> words, there's a linux/ api for it).  i dont think that's the case for
> OF (which is what you were implying?) ...

Only works if the functions are "declared" everywhere;
the stuff that's included in header files.

A "definition" would be available at link time (except
for inlined functions, in headers).  Actual C functions.

If indeed OF functions don't have declarations which are
available on all platforms, that might be worth fixing
to enable this approach to #ifdef elimination.

- Dave


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