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

Support misaligned load/store traps for kernel and userspace

modulename: traps_misaligned.ko

configname: CONFIG_RISCV_MISALIGNED

Linux Kernel Configuration
└─>Platform type
└─>Support misaligned load/store traps for kernel and userspace
In linux kernel since version 4.14.330 (release Date: 2023-11-20)  
Say Y here if you want the kernel to embed support for misaligned
load/store for both kernel and userspace. When disable, misaligned
accesses will generate SIGBUS in userspace and panic in kernel.

source code:
selects
CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW