linux-kernel - Re: [PATCH] i2c: allow building emev2 without slave mode again

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Date:	Mon, 14 Dec 2015 13:02:27 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	kbuild test robot <lkp@...el.com>, kbuild-all@...org,
	linux-i2c@...r.kernel.org,
	Niklas Söderlund 
	<niklas.soderlund+renesas@...natech.se>, linux-sh@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: allow building emev2 without slave mode again

On Sunday 13 December 2015 10:09:59 Wolfram Sang wrote:
> 
> What about not ifdeffing the inline function and keep the build error
> whenever someone uses it without I2C_SLAVE being selected?

The inline function is only added there for the case that I2C_SLAVE is
disabled, so that would be pointless.

However, what we could do is move the extern declaration outside of
the #ifdef to make it always visible. The if(IS_ENABLED(CONFIG_I2C_SLAVE))
check should then ensure that it never actually gets called, and we
get a link error if some driver gets it wrong.

	Arnd
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