CONFIG_ERRATA_THEAD_GHOSTWRITE is not available for thedefaultarchitecture x86.
Result is shown for architecture riscv

Apply T-Head Ghostwrite errata

configname: CONFIG_ERRATA_THEAD_GHOSTWRITE

Linux Kernel Configuration
└─>CPU errata selection
└─>Apply T-Head Ghostwrite errata
In linux kernel since version 6.6.78 (release Date: 2025-02-17)  
The T-Head C9xx cores have a vulnerability in the xtheadvector
instruction set. When this errata is enabled, the CPUs will be probed
to determine if they are vulnerable and disable xtheadvector.

If you don't know what to do here, say "Y".