CONFIG_ARM64_ERRATUM_2253138 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64

Neoverse-N2: 2253138: workaround TRBE writing to address out-of-range

configname: CONFIG_ARM64_ERRATUM_2253138

Linux Kernel Configuration
└─>Kernel Features
└─>ARM errata workarounds via the alternatives framework
└─>Neoverse-N2: 2253138: workaround TRBE writing to address out-of-range
In linux kernel since version 5.2 (release Date: 2019-07-07)  
This option adds the workaround for ARM Neoverse-N2 erratum 2253138.

Affected Neoverse-N2 cores might write to an out-of-range address, not reserved
for TRBE. Under some conditions, the TRBE might generate a write to the next
virtually addressed page following the last page of the TRBE address space
(i.e., the TRBLIMITR_EL1.LIMIT), instead of wrapping around to the base.

Work around this in the driver by always making sure that there is a
page beyond the TRBLIMITR_EL1.LIMIT, within the space allowed for the TRBE.

If unsure, say Y.