1 files changed, 13 insertions, 0 deletions

diff --git a/block/Kconfig b/block/Kconfig
index 161491d0a879..0363cd731320 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -88,6 +88,19 @@ config BLK_DEV_INTEGRITY
         T10/SCSI Data Integrity Field or the T13/ATA External Path
         Protection.  If in doubt, say N.
 
+config BLK_DEV_DAX
+        bool "Block device DAX support"
+        depends on FS_DAX
+        depends on BROKEN
+        help
+          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.
+
 config BLK_DEV_THROTTLING
         bool "Block layer bio throttling support"
         depends on BLK_CGROUP=y