CONFIG_MIPS_L1_CACHE_SHIFT_6 is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

CONFIG_MIPS_L1_CACHE_SHIFT_6 (not configurable)

configname: CONFIG_MIPS_L1_CACHE_SHIFT_6

Linux Kernel Configuration
└─>MIPS_L1_CACHE_SHIFT_6
In linux kernel since version 3.14 (release Date: 2014-03-30)