CC [M]  drivers/scsi/libiscsi_tcp.o
  CC [M]  drivers/scsi/iscsi_tcp.o
  CC [M]  drivers/scsi/iscsi_boot_sysfs.o
  CC [M]  drivers/scsi/scsi_wait_scan.o
  CC [M]  drivers/spi/spi_sunxi.o
In file included from arch/arm/mach-sun4i/include/mach/gpio.h:22:0,
                 from drivers/spi/spi_sunxi.c:27:
include/asm-generic/gpio.h: In function ‘gpio_get_value_cansleep’:
include/asm-generic/gpio.h:218:2: error: implicit declaration of function ‘__gpio_get_value’ [-Werror=implicit-function-declaration]
include/asm-generic/gpio.h: In function ‘gpio_set_value_cansleep’:
include/asm-generic/gpio.h:224:2: error: implicit declaration of function ‘__gpio_set_value’ [-Werror=implicit-function-declaration]
drivers/spi/spi_sunxi.c: In function ‘spi_sunxi_register_spidev’:
drivers/spi/spi_sunxi.c:1836:2: error: implicit declaration of function ‘gpio_request’ [-Werror=implicit-function-declaration]
drivers/spi/spi_sunxi.c:1837:3: error: implicit declaration of function ‘__gpio_to_irq’ [-Werror=implicit-function-declaration]
cc1: some warnings being treated as errors
make[2]: *** [drivers/spi/spi_sunxi.o] Error 1
make[1]: *** [drivers/spi] Error 2
make: *** [drivers] Error 2