dax for 5.18

- Fix a crash due to a missing rcu_barrier() in dax_fs_exit()
 
 - Fix two miscellaneous doc issues
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Merge tag 'dax-for-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

Pull DAX updates from Dan Williams:
 "Andrew has been shepherding major dax features that touch the core -mm
  through his tree, but I still collect the dax updates that are core-mm
  independent.

   - Fix a crash due to a missing rcu_barrier() in dax_fs_exit()

   - Fix two miscellaneous doc issues"

* tag 'dax-for-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  dax: Fix missing kdoc for dax_device
  dax: make sure inodes are flushed before destroy cache
  fsdax: fix function description

drivers/dax/super.c

@@ -21,6 +21,7 @@
  * @cdev: optional character interface for "device dax"
  * @private: dax driver private data
  * @flags: state and boolean properties
+ * @ops: operations for this device
  */
 struct dax_device {
 	struct inode inode;
@@ -476,6 +477,7 @@ static int dax_fs_init(void)
 static void dax_fs_exit(void)
 {
 	kern_unmount(dax_mnt);
+	rcu_barrier();
 	kmem_cache_destroy(dax_cache);
 }
 

fs/dax.c

@@ -389,7 +389,7 @@ static struct page *dax_busy_page(void *entry)
 }
 
 /*
- * dax_lock_mapping_entry - Lock the DAX entry corresponding to a page
+ * dax_lock_page - Lock the DAX entry corresponding to a page
  * @page: The page whose entry we want to lock
  *
  * Context: Process context.