Intel: device-dax: Kill dax_region base

mainline inclusion
from mainline-v5.1-rc1
commit 93694f96
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I47H3V
CVE: NA

--------------------------------

commit 93694f96 upstream.

Nothing consumes this attribute of a region and devres otherwise
remembers the value for de-allocation purposes.
Signed-off-by: NDan Williams <dan.j.williams@intel.com>
Signed-off-by: NFan Du <fan.du@intel.com>
Signed-off-by: NJackie Liu <liuyun01@kylinos.cn>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/dax/dax-private.h

@@ -19,7 +19,6 @@
 /**
  * struct dax_region - mapping infrastructure for dax devices
  * @id: kernel-wide unique region for a memory range
- * @base: linear address corresponding to @res
  * @kref: to pin while other agents have a need to do lookups
  * @dev: parent device backing this region
  * @align: allocation and mapping alignment for child dax devices
@@ -28,7 +27,6 @@
  */
 struct dax_region {
 	int id;
-	void *base;
 	struct kref kref;
 	struct device *dev;
 	unsigned int align;

drivers/dax/device-dax.h

@@ -17,9 +17,8 @@ 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_region *alloc_dax_region(struct device *parent, int region_id,
+		struct resource *res, unsigned int align, unsigned long flags);
 struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
 		int id, struct resource *res, int count);
 #endif /* __DEVICE_DAX_H__ */

drivers/dax/device.c

@@ -100,7 +100,7 @@ static void dax_region_unregister(void *region)
 }
 
 struct dax_region *alloc_dax_region(struct device *parent, int region_id,
-		struct resource *res, unsigned int align, void *addr,
+		struct resource *res, unsigned int align,
 		unsigned long pfn_flags)
 {
 	struct dax_region *dax_region;
@@ -130,7 +130,6 @@ struct dax_region *alloc_dax_region(struct device *parent, int region_id,
 	dax_region->id = region_id;
 	dax_region->align = align;
 	dax_region->dev = parent;
-	dax_region->base = addr;
 	if (sysfs_create_groups(&parent->kobj, dax_region_attribute_groups)) {
 		kfree(dax_region);
 		return NULL;

drivers/dax/pmem.c

@@ -125,7 +125,7 @@ static int dax_pmem_probe(struct device *dev)
 		return -EINVAL;
 
 	dax_region = alloc_dax_region(dev, region_id, &res,
-			le32_to_cpu(pfn_sb->align), addr, PFN_DEV|PFN_MAP);
+			le32_to_cpu(pfn_sb->align), PFN_DEV|PFN_MAP);
 	if (!dax_region)
 		return -ENOMEM;