drivers/built-in.o: In function `cma_map_kernel':
clk-ac100.c:(.text+0xc3cc4): undefined reference to `__get_dma_pgprot'
drivers/built-in.o: In function `psmouse_extensions':
clk-ac100.c:(.text+0x1dd4a8): undefined reference to `lifebook_detect'
Makefile:876: recipe for target '.tmp_vmlinux1' failed