default or selected kernelversion does not have config value CONFIG_BLK_DEV_DAX.
Result is shown for kernelversion 5.4.33
Block device DAX support
configname: CONFIG_BLK_DEV_DAX
Linux Kernel Configuration
└─>Enable the block layer
└─>Block device DAX support
In linux kernel since version 4.5 (release Date: 2016-03-13)
When DAX support is available (CONFIG_FS_DAX) raw block
devices can also support direct userspace access to the
storage capacity via MMAP(2) similar to a file on a
DAX-enabled filesystem. However, the DAX I/O-path disables
some standard I/O-statistics, and the MMAP(2) path has some
operational differences due to bypassing the page
cache. If in doubt, say N.
devices can also support direct userspace access to the
storage capacity via MMAP(2) similar to a file on a
DAX-enabled filesystem. However, the DAX I/O-path disables
some standard I/O-statistics, and the MMAP(2) path has some
operational differences due to bypassing the page
cache. If in doubt, say N.