ERROR: "devm_ioremap_resource" [drivers/mtd/nand/oxnas_nand.ko] undefined!

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   238d1d0f79f619d75c2cc741d6770fb0986aef24
commit: 668592492409498afc277da41e84799e1d2255c2 mtd: nand: Add OX820 NAND Support
date:   2 months ago
config: um-allmodconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 668592492409498afc277da41e84799e1d2255c2
        # save the attached .config to linux build tree
        make ARCH=um 

All errors (new ones prefixed by >>):

   ERROR: "devm_gpiod_get_optional" [net/rfkill/rfkill-gpio.ko] undefined!
   ERROR: "devm_gpio_request_one" [drivers/regulator/tps62360-regulator.ko] undefined!
   ERROR: "devm_gpiod_get_optional" [drivers/regulator/pwm-regulator.ko] undefined!
   ERROR: "devm_gpio_request_one" [drivers/regulator/max8973-regulator.ko] undefined!
   ERROR: "devm_gpio_request_one" [drivers/regulator/max8952.ko] undefined!
   ERROR: "devm_gpio_request_one" [drivers/regulator/lp872x.ko] undefined!
   ERROR: "devm_gpio_request" [drivers/pps/clients/pps-gpio.ko] undefined!
   ERROR: "devm_gpiod_get_optional" [drivers/power/supply/sbs-battery.ko] undefined!
   ERROR: "devm_gpio_request" [drivers/power/supply/max8903_charger.ko] undefined!
   ERROR: "devm_gpiod_get_index" [drivers/power/supply/bq25890_charger.ko] undefined!
   ERROR: "devm_gpiod_get_optional" [drivers/power/supply/bq24735-charger.ko] undefined!
   ERROR: "devm_gpiod_get_optional" [drivers/power/supply/bq24257_charger.ko] undefined!
   ERROR: "devm_gpio_request_one" [drivers/nfc/st21nfca/st21nfca_i2c.ko] undefined!
   ERROR: "devm_gpio_request_one" [drivers/nfc/st-nci/st-nci_i2c.ko] undefined!
   ERROR: "devm_gpio_request_one" [drivers/nfc/nxp-nci/nxp-nci_i2c.ko] undefined!
   ERROR: "devm_gpio_free" [drivers/nfc/nfcmrvl/nfcmrvl.ko] undefined!
   ERROR: "devm_gpio_request_one" [drivers/nfc/nfcmrvl/nfcmrvl.ko] undefined!
   ERROR: "devm_gpiod_get" [drivers/nfc/fdp/fdp_i2c.ko] undefined!
   ERROR: "devm_gpio_request" [drivers/net/phy/mdio-gpio.ko] undefined!
   ERROR: "devm_gpiod_get_optional" [drivers/net/phy/at803x.ko] undefined!
   ERROR: "devm_gpiod_get_optional" [drivers/net/dsa/mv88e6xxx/mv88e6xxx.ko] undefined!
>> ERROR: "devm_ioremap_resource" [drivers/mtd/nand/oxnas_nand.ko] undefined!
   ERROR: "devm_gpio_request_one" [drivers/leds/leds-lt3593.ko] undefined!
   ERROR: "devm_gpiod_get_optional" [drivers/leds/leds-lp8860.ko] undefined!
   ERROR: "devm_gpio_request_one" [drivers/leds/leds-lp55xx-common.ko] undefined!
   ERROR: "devm_gpiod_get" [drivers/leds/leds-ktd2692.ko] undefined!
   ERROR: "devm_get_gpiod_from_child" [drivers/leds/leds-gpio.ko] undefined!
   ERROR: "devm_gpio_request_one" [drivers/leds/leds-gpio.ko] undefined!
   ERROR: "devm_gpiod_get_index" [drivers/iio/proximity/sx9500.ko] undefined!
   ERROR: "devm_gpiod_get_index" [drivers/iio/pressure/hp03.ko] undefined!
   ERROR: "devm_gpiod_get" [drivers/iio/pressure/bmp280.ko] undefined!
   ERROR: "devm_gpio_request_one" [drivers/iio/magnetometer/ak8975.ko] undefined!
   ERROR: "devm_gpiod_get_optional" [drivers/iio/dac/ad5592r-base.ko] undefined!
   ERROR: "devm_gpiod_get_index" [drivers/iio/accel/mma9551.ko] undefined!
   ERROR: "devm_gpiod_get" [drivers/extcon/extcon-usb-gpio.ko] undefined!
   ERROR: "devm_gpiod_get" [drivers/extcon/extcon-max3355.ko] undefined!
   ERROR: "devm_gpio_request_one" [drivers/extcon/extcon-gpio.ko] undefined!
   ERROR: "devm_gpiod_get" [drivers/bluetooth/hci_uart.ko] undefined!
   ERROR: "devm_ioremap_resource" [drivers/auxdisplay/img-ascii-lcd.ko] undefined!

---
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