dax: convert to the cdev api
A goal of the device-DAX interface is to be able to support many
exclusive allocations (partitions) of performance / feature
differentiated memory. This count may exceed the default minors limit
of 256.
As a result of switching to an embedded cdev the inode-to-dax_dev
conversion is simplified, as well as reference counting which can switch
to the cdev kobject lifetime.
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/dax/Kconfig b/drivers/dax/Kconfig
index cedab75..daadd20a 100644
--- a/drivers/dax/Kconfig
+++ b/drivers/dax/Kconfig
@@ -23,4 +23,9 @@
Say Y if unsure
+config NR_DEV_DAX
+ int "Maximum number of Device-DAX instances"
+ default 32768
+ range 256 2147483647
+
endif