I2C, compile error: via686a_attach_adapter()

[Ivan Gyurdiev <ivg2@cornell.edu>]

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  gcc -Wp,-MD,init/.version.o.d -D__KERNEL__ -Iinclude -Wall 
- -Wstrict-prototypes -Wno-trigraphs -O2 -fno-strict-aliasing -fno-common -pipe 
- -mpreferred-stack-boundary=2 -march=athlon -Iinclude/asm-i386/mach-default 
- -fomit-frame-pointer -nostdinc -iwithprefix include    
- -DKBUILD_BASENAME=version -DKBUILD_MODNAME=version -c -o init/.tmp_version.o 
init/version.c
   ld -m elf_i386  -r -o init/built-in.o init/main.o init/version.o 
init/mounts.o init/initramfs.o
        ld -m elf_i386  -T arch/i386/vmlinux.lds.s arch/i386/kernel/head.o 
arch/i386/kernel/init_task.o   init/built-in.o --start-group  usr/built-in.o  
arch/i386/kernel/built-in.o  arch/i386/mm/built-in.o  
arch/i386/mach-default/built-in.o  kernel/built-in.o  mm/built-in.o  
fs/built-in.o  ipc/built-in.o  security/built-in.o  crypto/built-in.o  
lib/lib.a  arch/i386/lib/lib.a  drivers/built-in.o  sound/built-in.o  
arch/i386/pci/built-in.o  net/built-in.o --end-group  -o .tmp_vmlinux1
drivers/built-in.o(.text+0xa641b): In function `via686a_attach_adapter':
: undefined reference to `i2c_detect'



Bitkeeper with relevant config: 
I2C, I2C_CHARDEV, SENSORS_VIA686A  = Y

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