CONFIG_SERIAL_CORE (not configurable)

modulename: serial_core.ko

configname: CONFIG_SERIAL_CORE

Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>Serial drivers
└─>SERIAL_CORE
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
source code:
drivers/tty/serial/serial_core.c