device-dax: rename 'dax_dev' to 'dev_dax'

In preparation for introducing a struct dax_device type to the kernel
global type namespace, rename dax_dev to dev_dax. A 'dax_device'
instance will be a generic device-driver object for any provider of dax
functionality. A 'dev_dax' object is a device-dax-driver local /
internal instance.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/dax/dax.h

@@ -13,13 +13,13 @@
 #ifndef __DAX_H__
 #define __DAX_H__
 struct device;
-struct dax_dev;
+struct dev_dax;
 struct resource;
 struct dax_region;
 void dax_region_put(struct dax_region *dax_region);
 struct dax_region *alloc_dax_region(struct device *parent,
 		int region_id, struct resource *res, unsigned int align,
 		void *addr, unsigned long flags);
-struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
+struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
 		struct resource *res, int count);
 #endif /* __DAX_H__ */

drivers/dax/pmem.c

@@ -61,8 +61,8 @@ static int dax_pmem_probe(struct device *dev)
 	int rc;
 	void *addr;
 	struct resource res;
-	struct dax_dev *dax_dev;
 	struct nd_pfn_sb *pfn_sb;
+	struct dev_dax *dev_dax;
 	struct dax_pmem *dax_pmem;
 	struct nd_region *nd_region;
 	struct nd_namespace_io *nsio;
@@ -130,12 +130,12 @@ static int dax_pmem_probe(struct device *dev)
 		return -ENOMEM;
 
 	/* TODO: support for subdividing a dax region... */
-	dax_dev = devm_create_dax_dev(dax_region, &res, 1);
+	dev_dax = devm_create_dev_dax(dax_region, &res, 1);
 
-	/* child dax_dev instances now own the lifetime of the dax_region */
+	/* child dev_dax instances now own the lifetime of the dax_region */
 	dax_region_put(dax_region);
 
-	return PTR_ERR_OR_ZERO(dax_dev);
+	return PTR_ERR_OR_ZERO(dev_dax);
 }
 
 static struct nd_device_driver dax_pmem_driver = {