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If CONFIG_GPIO_SYSFS=n, compilation fails with drivers/built-in.o: In function `gpio_export_with_name': include/asm-generic/gpio.h:128: undefined reference to `__gpiod_export' This is because the stub in that case has the wrong name, _gpiod_export() - note the missing underscore (_) at the start. Fix the stub, and add the correct prototype for the real implementation. Signed-off-by: André Draszik <git@andred.net>