CONFIG_ACPI_GENERIC_GSI (not configurable)

configname: CONFIG_ACPI_GENERIC_GSI

Linux Kernel Configuration
└─>Power management and ACPI options
└─>ACPI (Advanced Configuration and Power Interface) Support
└─>ACPI_GENERIC_GSI
In linux kernel since version 4.2 (release Date: 2015-08-30)  
depends
CONFIG_ACPI