CONFIG_FB_SYS_FILLRECT (not configurable)

modulename: sysfillrect.ko

configname: CONFIG_FB_SYS_FILLRECT

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Frame buffer Devices
└─>Support for frame buffer devices
└─>FB_SYS_FILLRECT
In linux kernel since version 2.6.24 (release Date: 2008-01-24)  
Include the sys_fillrect function for generic software rectangle
filling. This is used by drivers that don't provide their own
(accelerated) version and the framebuffer is in system RAM.

source code:
drivers/video/fbdev/core/sysfillrect.c