[patch] device-dax: Tell kbuild DEV_DAX_PMEM depends on DEV_DAX

[Mike Galbraith]

ERROR: "devm_create_dev_dax" [drivers/dax/dax_pmem.ko] undefined!
ERROR: "alloc_dax_region" [drivers/dax/dax_pmem.ko] undefined!
ERROR: "dax_region_put" [drivers/dax/dax_pmem.ko] undefined!

Signed-off-by: Mike Galbraith <efault@xxxxxx>
---
 drivers/dax/Kconfig |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/dax/Kconfig
+++ b/drivers/dax/Kconfig
@@ -19,7 +19,7 @@ config DEV_DAX
 
 config DEV_DAX_PMEM
 	tristate "PMEM DAX: direct access to persistent memory"
-	depends on LIBNVDIMM && NVDIMM_DAX
+	depends on LIBNVDIMM && NVDIMM_DAX && DEV_DAX
 	default DEV_DAX
 	help
 	  Support raw access to persistent memory.  Note that this