CONFIG_HOTPLUG is not available for thedefaultarchitecture x86.
Result is shown for architecture tile
default or selected kernelversion does not have config value CONFIG_HOTPLUG.
Result is shown for kernelversion 6.2.5

Support for hot-pluggable devices

modulename: hotplug.ko

and/or

setup-bus.ko

configname: CONFIG_HOTPLUG

Linux Kernel Configuration
└─>Bus options
└─>Support for hot-pluggable devices
In linux kernel since version 2.6.13 (release Date: 2005-08-28)  
Say Y here if you want to plug devices into your computer while
the system is running, and be able to use them quickly. In many
cases, the devices can likewise be unplugged at any time too.
One well-known example of this is USB.

source code:
drivers/pci/hotplug.c

is depended by
CONFIG_HOTPLUG_CPU