CONFIG_HAVE_ARCH_BITREVERSE (not configurable)

configname: CONFIG_HAVE_ARCH_BITREVERSE

Linux Kernel Configuration
└─>Library routines
└─>HAVE_ARCH_BITREVERSE
In linux kernel since version 4 (release Date: 2015-04-12)  
This option enables the use of hardware bit-reversal instructions on
architectures which support such operations.