CONFIG_DCACHE_WRITE_BACK is not available for thedefaultarchitecture x86.
Result is shown for architecture sh64
default or selected kernelversion does not have config value CONFIG_DCACHE_WRITE_BACK.
Result is shown for kernelversion 5.4.123
Write-back
configname: CONFIG_DCACHE_WRITE_BACK
DCache mode
└─>Write-back