Extern or forward variable declaration at include/asm-generic/gpio.h, line 51 References: arch/arm/plat-orion/gpio.c, line 440 drivers/gpio/gpiolib.c, line 4297 drivers/gpio/gpiolib.c, line 4330 drivers/gpio/gpiolib.c, line 4349 drivers/gpio/gpiolib.c, line 4368 drivers/gpio/gpiolib.c, line 4372 drivers/gpu/drm/sti/sti_dvo.c, line 166 drivers/gpu/drm/sti/sti_dvo.c, line 179 drivers/gpu/drm/vc4/vc4_hdmi.c, line 105 drivers/mmc/host/atmel-mci.c, line 409 drivers/mmc/host/atmel-mci.c, line 451 drivers/mmc/host/atmel-mci.c, line 497 drivers/mmc/host/dw_mmc.c, line 107 drivers/mmc/host/dw_mmc.c, line 148 drivers/net/ieee802154/at86rf230.c, line 1612 drivers/pci/controller/dwc/pcie-tegra194.c, line 630 drivers/pinctrl/core.c, line 1623 drivers/pinctrl/core.c, line 1682 drivers/pinctrl/core.c, line 1728 drivers/pinctrl/core.c, line 1762 drivers/pinctrl/core.c, line 1805 drivers/pinctrl/core.c, line 1843 drivers/pinctrl/pinctrl-st.c, line 997 drivers/pinctrl/spear/pinctrl-spear.c, line 141 drivers/usb/gadget/udc/at91_udc.c, line 105 drivers/usb/gadget/udc/at91_udc.c, line 163 drivers/usb/gadget/udc/at91_udc.c, line 182 drivers/usb/gadget/udc/pxa25x_udc.c, line 1236 drivers/usb/gadget/udc/pxa27x_udc.c, line 90 drivers/usb/gadget/udc/pxa27x_udc.c, line 136 drivers/usb/gadget/udc/pxa27x_udc.c, line 169 drivers/usb/gadget/udc/s3c2410_udc.c, line 117