drm/i915: Fix gtt_view asserts

gcc is too smart for us and doesn't evaluate BUILD_BUG_ON()s in
unused static inlines. Collect them up in one static inline and
actually call it to make sure gcc sees it.

Cc: Chris Wilson <[e-mail]>
Suggested-by: Chris Wilson <[e-mail]>
Signed-off-by: Ville Syrjälä <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
Reviewed-by: Chris Wilson <[e-mail]>

drivers/gpu/drm/i915/i915_gem_gtt.h

···
 	} plane[2];
 } __packed;
 
-static inline void assert_intel_rotation_info_is_packed(void)
-{
-	BUILD_BUG_ON(sizeof(struct intel_rotation_info) != 8*sizeof(unsigned int));
-}
-
 struct intel_partial_info {
 	u64 offset;
 	unsigned int size;
 } __packed;
-
-static inline void assert_intel_partial_info_is_packed(void)
-{
-	BUILD_BUG_ON(sizeof(struct intel_partial_info) != sizeof(u64) + sizeof(unsigned int));
-}
 
 enum i915_ggtt_view_type {
 	I915_GGTT_VIEW_NORMAL = 0,
···
 	I915_GGTT_VIEW_PARTIAL = sizeof(struct intel_partial_info),
 };
 
-static inline void assert_i915_ggtt_view_type_is_unique(void)
+static inline void assert_i915_gem_gtt_types(void)
 {
+	BUILD_BUG_ON(sizeof(struct intel_rotation_info) != 8*sizeof(unsigned int));
+	BUILD_BUG_ON(sizeof(struct intel_partial_info) != sizeof(u64) + sizeof(unsigned int));
+
 	/* As we encode the size of each branch inside the union into its type,
 	 * we have to be careful that each branch has a unique size.
 	 */

drivers/gpu/drm/i915/i915_vma.h

···
 	if (cmp)
 		return cmp;
 
+	assert_i915_gem_gtt_types();
+
 	/* ggtt_view.type also encodes its size so that we both distinguish
 	 * different views using it as a "type" and also use a compact (no
 	 * accessing of uninitialised padding bytes) memcmp without storing