diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index c890b7992d5cb2ac9eccf67874ed3b44dffde80a..8304a7f1ec3f98da958f8e9cc6cd8bba58035f30 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -99,6 +99,8 @@ enum drm_i915_gem_engine_class {
 	I915_ENGINE_CLASS_VIDEO		= 2,
 	I915_ENGINE_CLASS_VIDEO_ENHANCE	= 3,
 
+	/* should be kept compact */
+
 	I915_ENGINE_CLASS_INVALID	= -1
 };
 
@@ -319,6 +321,7 @@ typedef struct _drm_i915_sarea {
 #define DRM_I915_PERF_ADD_CONFIG	0x37
 #define DRM_I915_PERF_REMOVE_CONFIG	0x38
 #define DRM_I915_QUERY			0x39
+/* Must be kept compact -- no holes */
 
 #define DRM_IOCTL_I915_INIT		DRM_IOW( DRM_COMMAND_BASE + DRM_I915_INIT, drm_i915_init_t)
 #define DRM_IOCTL_I915_FLUSH		DRM_IO ( DRM_COMMAND_BASE + DRM_I915_FLUSH)
@@ -559,6 +562,8 @@ typedef struct drm_i915_irq_wait {
  */
 #define I915_PARAM_MMAP_GTT_COHERENT	52
 
+/* Must be kept compact -- no holes and well documented */
+
 typedef struct drm_i915_getparam {
 	__s32 param;
 	/*
@@ -574,6 +579,7 @@ typedef struct drm_i915_getparam {
 #define I915_SETPARAM_TEX_LRU_LOG_GRANULARITY             2
 #define I915_SETPARAM_ALLOW_BATCHBUFFER                   3
 #define I915_SETPARAM_NUM_USED_FENCES                     4
+/* Must be kept compact -- no holes */
 
 typedef struct drm_i915_setparam {
 	int param;
@@ -1511,6 +1517,7 @@ struct drm_i915_gem_context_param {
  * On creation, all new contexts are marked as recoverable.
  */
 #define I915_CONTEXT_PARAM_RECOVERABLE	0x8
+/* Must be kept compact -- no holes and well documented */
 	__u64 value;
 };
 
@@ -1734,6 +1741,7 @@ struct drm_i915_perf_oa_config {
 struct drm_i915_query_item {
 	__u64 query_id;
 #define DRM_I915_QUERY_TOPOLOGY_INFO    1
+/* Must be kept compact -- no holes and well documented */
 
 	/*
 	 * When set to zero by userspace, this is filled with the size of the