diff mbox series

drm/i915: Fix gtt_view asserts

Message ID 20180828133723.18505-1-ville.syrjala@linux.intel.com (mailing list archive)
State New, archived
Headers show
Series drm/i915: Fix gtt_view asserts | expand

Commit Message

Ville Syrjälä Aug. 28, 2018, 1:37 p.m. UTC 
From: Ville Syrjälä <ville.syrjala@linux.intel.com>

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 <chris@chris-wilson.co.uk>
Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_gem_gtt.h | 15 ++++-----------
 drivers/gpu/drm/i915/i915_vma.h     |  2 ++
 2 files changed, 6 insertions(+), 11 deletions(-)

Comments

Chris Wilson Aug. 28, 2018, 1:48 p.m. UTC | #1 
Quoting Ville Syrjala (2018-08-28 14:37:23)
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> 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 <chris@chris-wilson.co.uk>
> Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris
diff mbox series

Patch

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index dd161c187a68..01d83a943142 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -167,29 +167,22 @@  struct intel_rotation_info {
 	} 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_ROTATED = sizeof(struct intel_rotation_info),
 	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.
 	 */
diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h
index f1ba40bbe6f9..4f7c1c7599f4 100644
--- a/drivers/gpu/drm/i915/i915_vma.h
+++ b/drivers/gpu/drm/i915/i915_vma.h
@@ -251,6 +251,8 @@  i915_vma_compare(struct i915_vma *vma,
 	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