CONFIG_ARC_DSP_SAVE_RESTORE_REGS is not available for thedefaultarchitecture x86.
Result is shown for architecture arc

CONFIG_ARC_DSP_SAVE_RESTORE_REGS (not configurable)

configname: CONFIG_ARC_DSP_SAVE_RESTORE_REGS

Linux Kernel Configuration
└─>ARC Architecture Configuration
└─>ARC CPU Configuration
└─>ARC_DSP_SAVE_RESTORE_REGS
In linux kernel since version 5.1 (release Date: 2019-05-05)