CONFIG_ARM_CPU_SUSPEND is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_ARM_CPU_SUSPEND (not configurable)

modulename: sleep.ko

configname: CONFIG_ARM_CPU_SUSPEND

Linux Kernel Configuration
└─>Power management options
└─>ARM_CPU_SUSPEND
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
arch/arm/kernel/