linux-kernel - Re: randconfig build error with next-20150812, in drivers/i2c/busses/i2c-i801.c

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Date:	Fri, 25 Sep 2015 09:36:10 +0200
From:	Jean Delvare <jdelvare@...e.de>
To:	Jim Davis <jim.epost@...il.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next <linux-next@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>, jdelvare@...e.com,
	wsa@...-dreams.de, linux-i2c@...r.kernel.org,
	Matt Fleming <matt.fleming@...el.com>
Subject: Re: randconfig build error with next-20150812, in
 drivers/i2c/busses/i2c-i801.c

On Wed, 12 Aug 2015 08:42:18 -0700, Jim Davis wrote:
> Building with the attached random configuration file,
> 
> drivers/built-in.o: In function `dmi_check_onboard_devices':
> i2c-i801.c:(.text+0x126b36): undefined reference to `i2c_new_device'
> drivers/built-in.o: In function `i801_remove':
> i2c-i801.c:(.text+0x126b86): undefined reference to `i2c_del_adapter'
> drivers/built-in.o: In function `i801_probe':
> i2c-i801.c:(.text+0x127d08): undefined reference to `i2c_add_adapter'
> i2c-i801.c:(.text+0x127d6e): undefined reference to `i2c_new_device'

Sorry for the late reply. The error is caused by the following
combination of options:

CONFIG_I2C=m
CONFIG_I2C_I801=y

I can reproduce it even with mainline now. This is caused by
CONFIG_ITCO_WDT=y, which selects CONFIG_I2C_I801=y without selecting
its dependencies (CONFIG_I2C.)

Thanks for reporting, I'll post a fix shortly.

-- 
Jean Delvare
SUSE L3 Support
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