+config FS_DAX
+ bool "Direct Access (DAX) support"
+ depends on MMU
+ depends on !(ARM || MIPS || SPARC)
+ help
+ Direct Access (DAX) can be used on memory-backed block devices.
+ If the block device supports DAX and the filesystem supports DAX,
+ then you can avoid using the pagecache to buffer I/Os. Turning
+ on this option will compile in support for DAX; you will need to
+ mount the filesystem using the -o dax option.
+
+ If you do not have a block device that is capable of using this,
+ or if unsure, say N. Saying Y will increase the size of the kernel
+ by about 5kB.
+