Kernel 4.1-rc1 build fails  on Sam460ex amcc 460ex powerpc Canyonlands with 
CONFIG_SATA_DWC=y

sata_dwc_460ex.c:(.text+0xa165c): undefined reference to `dw_dma_remove'
drivers/built-in.o: In function `sata_dwc_probe':
sata_dwc_460ex.c:(.text+0xa1900): undefined reference to `dw_dma_probe'
sata_dwc_460ex.c:(.text+0xa1954): undefined reference to `dw_dma_remove'
make: *** [vmlinux] Error 1