CONFIG_XOR_BLOCKS (not configurable)

modulename: xor.ko

and/or

xor-neon.ko

configname: CONFIG_XOR_BLOCKS

Linux Kernel Configuration
└─>XOR_BLOCKS
In linux kernel since version 2.6.23 (release Date: 2007-10-09)  
source code:
crypto/xor.c
is depended by
CONFIG_BTRFS_FS