CONFIG_ZSTD_COMMON (not configurable)

modulename: zstd_common.ko

configname: CONFIG_ZSTD_COMMON

Linux Kernel Configuration
└─>Library routines
└─>ZSTD_COMMON
In linux kernel since version 6.1 (release Date: 2022-12-11)  
source code:
lib/zstd/
selects
CONFIG_XXHASH