CONFIG_IRQ_UART2_TX is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin
default or selected kernelversion does not have config value CONFIG_IRQ_UART2_TX.
Result is shown for kernelversion 6.7-rc3

IRQ_UART2_TX

configname: CONFIG_IRQ_UART2_TX

Linux Kernel Configuration
└─>BF538 Specific Configuration
└─>Priority
└─>IRQ_UART2_TX
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
depends
CONFIG_BF538 or CONFIG_BF539