CONFIG_CPU_CACHE_ALIASING is not available for thedefaultarchitecture x86.
Result is shown for architecture nds32

Aliasing cache

configname: CONFIG_CPU_CACHE_ALIASING

Linux Kernel Configuration
└─>Aliasing cache
In linux kernel since version 4.2 (release Date: 2015-08-30)  
If this CPU is using VIPT data cache and its cache way size is larger
than page size, say Y. If it is using PIPT data cache, say N.

If unsure, say Y.