Building with the attached random configuration file,


fsl_ftm_timer.c:(.init.text+0xe2b7): undefined reference to
`clocksource_mmio_readl_up'
fsl_ftm_timer.c:(.init.text+0xe2ca): undefined reference to
`clocksource_mmio_init'
drivers/built-in.o: In function `st_clksrc_of_register':
clksrc_st_lpc.c:(.init.text+0xe5bc): undefined reference to
`clocksource_mmio_readl_up'
clksrc_st_lpc.c:(.init.text+0xe5d7): undefined reference to
`clocksource_mmio_init'


-- 
Jim