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

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Date:	Sun, 13 Dec 2015 10:09:59 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Arnd Bergmann <arnd@...db.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


> > > The slave_cb callback function is supposed to set the 'value'
> > > here,
> > 
> > Only if a master wants to READ from us.
> 
> Right, and can this never fail?

Exactly. The slave can stretch the clock if the value to be sent to the
master needs some processing first, but it must deliver something.

> With my current code to turn i2c_slave_event() into an empty inline function
> in case of !CONFIG_I2C_SLAVE, the compiler knows that "value" is uninitialized
> at the point where we write it to the register, and warns about it.

I overlooked that your first patch changed this code, sorry. Now I see
the problem.

What about not ifdeffing the inline function and keep the build error
whenever someone uses it without I2C_SLAVE being selected?

Thanks,

   Wolfram


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