CONFIG_KERNEL_MODE_NEON is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
Support for NEON in kernel mode
configname: CONFIG_KERNEL_MODE_NEON
Linux Kernel Configuration
└─>Floating point emulation
└─>Support for NEON in kernel mode
In linux kernel since version 3.10 (release Date: 2013-06-30)
Say Y to include support for NEON in kernel mode.