drm: fix "persistant" typo

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index 50852aa..a6bd117 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -158,9 +158,9 @@
  * the object is destroyed.
  * @event_queue: Queue for processes waiting on buffer object status change.
  * @mem: structure describing current placement.
- * @persistant_swap_storage: Usually the swap storage is deleted for buffers
+ * @persistent_swap_storage: Usually the swap storage is deleted for buffers
  * pinned in physical memory. If this behaviour is not desired, this member
- * holds a pointer to a persistant shmem object.
+ * holds a pointer to a persistent shmem object.
  * @ttm: TTM structure holding system pages.
  * @evicted: Whether the object was evicted without user-space knowing.
  * @cpu_writes: For synchronization. Number of cpu writers.
@@ -221,7 +221,7 @@
 	 */
 
 	struct ttm_mem_reg mem;
-	struct file *persistant_swap_storage;
+	struct file *persistent_swap_storage;
 	struct ttm_tt *ttm;
 	bool evicted;
 
@@ -459,9 +459,9 @@
  * user buffer object.
  * @interruptible: If needing to sleep to wait for GPU resources,
  * sleep interruptible.
- * @persistant_swap_storage: Usually the swap storage is deleted for buffers
+ * @persistent_swap_storage: Usually the swap storage is deleted for buffers
  * pinned in physical memory. If this behaviour is not desired, this member
- * holds a pointer to a persistant shmem object. Typically, this would
+ * holds a pointer to a persistent shmem object. Typically, this would
  * point to the shmem object backing a GEM object if TTM is used to back a
  * GEM user interface.
  * @acc_size: Accounted size for this object.
@@ -490,7 +490,7 @@
 			uint32_t page_alignment,
 			unsigned long buffer_start,
 			bool interrubtible,
-			struct file *persistant_swap_storage,
+			struct file *persistent_swap_storage,
 			size_t acc_size,
 			void (*destroy) (struct ttm_buffer_object *));
 /**
@@ -506,9 +506,9 @@
  * user buffer object.
  * @interruptible: If needing to sleep while waiting for GPU resources,
  * sleep interruptible.
- * @persistant_swap_storage: Usually the swap storage is deleted for buffers
+ * @persistent_swap_storage: Usually the swap storage is deleted for buffers
  * pinned in physical memory. If this behaviour is not desired, this member
- * holds a pointer to a persistant shmem object. Typically, this would
+ * holds a pointer to a persistent shmem object. Typically, this would
  * point to the shmem object backing a GEM object if TTM is used to back a
  * GEM user interface.
  * @p_bo: On successful completion *p_bo points to the created object.
@@ -528,7 +528,7 @@
 				uint32_t page_alignment,
 				unsigned long buffer_start,
 				bool interruptible,
-				struct file *persistant_swap_storage,
+				struct file *persistent_swap_storage,
 				struct ttm_buffer_object **p_bo);
 
 /**