default or selected kernelversion does not have config value CONFIG_MMU_GATHER_RCU_TABLE_FREE.
Result is shown for kernelversion 6.9.9

CONFIG_MMU_GATHER_RCU_TABLE_FREE (not configurable)

configname: CONFIG_MMU_GATHER_RCU_TABLE_FREE

Linux Kernel Configuration
└─>General architecture-dependent options
└─>MMU_GATHER_RCU_TABLE_FREE
In linux kernel since version 4.14.326 (release Date: 2023-09-23)