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From: Arnd Bergmann <arnd@arndb.de>
Subject: Re: [mmotm:master 7/197] ak8975.c:undefined reference to `i2c_smbus_write_byte_data'
Date: Thu, 26 Feb 2015 22:23:02 +0100
Message-ID: <2111473.jxZaFqNM44@wuerfel>
In-Reply-To: <20150226124432.2220a6bfd14cc9ce154f8a62@linux-foundation.org>
References: <201502261516.PXhQgKP2%fengguang.wu@intel.com> <20150226124432.2220a6bfd14cc9ce154f8a62@linux-foundation.org>
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To: Andrew Morton <akpm@linux-foundation.org>
Cc: kbuild test robot <fengguang.wu@intel.com>, kbuild-all@01.org, Johannes Weiner <hannes@cmpxchg.org>, Linux Memory Management List <linux-mm@kvack.org>, Randy Dunlap <rdunlap@infradead.org>, Jonathan Cameron <jic23@kernel.org>

On Thursday 26 February 2015 12:44:32 Andrew Morton wrote:
> On Thu, 26 Feb 2015 15:36:18 +0800 kbuild test robot <fengguang.wu@intel.com> wrote:
> 
> > It's probably a bug fix that unveils the link errors.
> > 
> > tree:   git://git.cmpxchg.org/linux-mmotm.git master
> > head:   87bf5bee8749a1d3c82d12a55a1e33f6a22da8ed
> > commit: 7d789876f1a932dfa1a70ae8eeba270aa34358ad [7/197] rtc: ds1685: fix ds1685_rtc_alarm_irq_enable build error
> > config: i386-randconfig-nexr0-0226 (attached as .config)
> > reproduce:
> >   git checkout 7d789876f1a932dfa1a70ae8eeba270aa34358ad
> >   # save the attached .config to linux build tree
> >   make ARCH=i386 
> > 
> > All error/warnings:
> > 
> >    drivers/built-in.o: In function `ak8975_set_mode':
> > >> ak8975.c:(.text+0x16c108): undefined reference to `i2c_smbus_write_byte_data'
> >    drivers/built-in.o: In function `ak8975_probe':
> > >> ak8975.c:(.text+0x16c29b): undefined reference to `i2c_smbus_read_i2c_block_data'
> > >> ak8975.c:(.text+0x16c348): undefined reference to `i2c_smbus_read_i2c_block_data'
> >    drivers/built-in.o: In function `ak8975_read_raw':
> > >> ak8975.c:(.text+0x16c66b): undefined reference to `i2c_smbus_read_byte_data'
> > >> ak8975.c:(.text+0x16c6a2): undefined reference to `i2c_smbus_read_byte_data'
> > >> ak8975.c:(.text+0x16c6c6): undefined reference to `i2c_smbus_read_byte_data'
> > >> ak8975.c:(.text+0x16c751): undefined reference to `i2c_smbus_read_word_data'
> >    drivers/built-in.o: In function `ak8975_driver_init':
> > >> ak8975.c:(.init.text+0x10e35): undefined reference to `i2c_register_driver'
> >    drivers/built-in.o: In function `ak8975_driver_exit':
> > >> ak8975.c:(.exit.text+0x1841): undefined reference to `i2c_del_driver'
> 
> Yes, something seems to have gone spectacularly wrong here.  "rtc:
> ds1685: fix ds1685_rtc_alarm_irq_enable build error" has nothing to do
> with i2c or with drivers/iio/magnetometer/ak8975.c.
> 
> And CONFIG_AK8975 depends on CONFIG_I2C.

I've also submitted a patch for this bug: