CONFIG_STM32_EXTI (not configurable)

modulename: irq-stm32-exti.ko

configname: CONFIG_STM32_EXTI

Linux Kernel Configuration
└─>Device Drivers
└─>IRQ chip support
└─>STM32_EXTI
In linux kernel since version 4.1 (release Date: 2015-06-21)  
source code:
drivers/irqchip/irq-stm32-exti.c
selects
CONFIG_IRQ_DOMAIN
CONFIG_GENERIC_IRQ_CHIP

is depended by
CONFIG_ARCH_STM32