default or selected kernelversion does not have config value CONFIG_ARCH_HAS_MMIO_FLUSH.
Result is shown for kernelversion 6.4.14
CONFIG_ARCH_HAS_MMIO_FLUSH (not configurable)
configname: CONFIG_ARCH_HAS_MMIO_FLUSH
Linux Kernel Configuration
└─>Library routines
└─>ARCH_HAS_MMIO_FLUSH