CONFIG_L1_MAX_PIECE is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin
default or selected kernelversion does not have config value CONFIG_L1_MAX_PIECE.
Result is shown for kernelversion 5.19-rc1

Set the max L1 SRAM pieces

configname: CONFIG_L1_MAX_PIECE

Blackfin Kernel Configuration
└─>Blackfin Processor Options
└─>Set the max L1 SRAM pieces
In linux kernel since version 2.6.24 (release Date: 2008-01-24)  
Set the max memory pieces for the L1 SRAM allocation algorithm.
Min value is 16. Max value is 1024.