CONFIG_ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64

CONFIG_ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD (not configurable)

configname: CONFIG_ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD

Linux Kernel Configuration
└─>Kernel Features
└─>ARM errata workarounds via the alternatives framework
└─>ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD
In linux kernel since version 6.1.76 (release Date: 2024-01-31)