linux-kernel - Re: [PATCH 3/3 v2] at91/atmel-mci: inclusion of sd/mmc driver in at91sam9g45 chip and board

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Date:	Sat, 7 Nov 2009 12:20:02 +0100
From:	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
To:	Ben Nizette <bn@...sdigital.com>
Cc:	Ryan Mallon <ryan@...ewatersys.com>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	kernel@...32linux.org, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	David Brownell <david-b@...bell.net>,
	Andrew Victor <avictor.za@...il.com>,
	akpm@...ux-foundation.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/3 v2] at91/atmel-mci: inclusion of sd/mmc driver in
 at91sam9g45 chip and board

Ben Nizette <bn@...sdigital.com> wrote:
> On Tue, 2009-11-03 at 15:30 +1300, Ryan Mallon wrote:
> > >   
> > IIRC, we can't mark static inline functions as weak, and we don't want
> > to turn gpio_is_valid into an actual function call. We could do some
> > preprocessor magic, but that gets a bit messy.  
> 
> Messy but generally accepted.

IIRC the most generally accepted way is to do

static inline bool gpio_is_valid(int pin)
{
	/* whatever */
}
#define gpio_is_valid gpio_is_valid

in the platform code and

#ifndef gpio_is_valid
/* provide definition of gpio_is_valid */
#endif

in the generic code. This way, there's only one symbol to grep for.

Haavard
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