CONFIG_IRQ_RESERVED_ERROR is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin
default or selected kernelversion does not have config value CONFIG_IRQ_RESERVED_ERROR.
Result is shown for kernelversion 6.7-rc3

Reserved Interrupt

configname: CONFIG_IRQ_RESERVED_ERROR

Linux Kernel Configuration
└─>BF561 Specific Configuration
└─>Priority
└─>Reserved Interrupt
In linux kernel since version 2.6.22 (release Date: 2007-07-08)  
depends
CONFIG_BF561