CONFIG_RISCV_MISALIGNED is not available for thedefaultarchitecture x86.
Result is shown for architecture riscv

CONFIG_RISCV_MISALIGNED (not configurable)

modulename: traps_misaligned.ko

and/or

unaligned_access_speed.ko

configname: CONFIG_RISCV_MISALIGNED

Linux Kernel Configuration
└─>Platform type
└─>RISCV_MISALIGNED
In linux kernel since version 4.14.330 (release Date: 2023-11-20)  
Embed support for emulating misaligned loads and stores.

source code:
arch/riscv/kernel/traps_misaligned.c
selects
CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW