i915: use a drm memory barrier define

diff --git a/shared-core/i915_dma.c b/shared-core/i915_dma.c
index f0fd603..9bc7431 100644 (file)
--- a/shared-core/i915_dma.c
+++ b/shared-core/i915_dma.c
@@ -1045,7 +1045,7 @@ static int i915_execbuffer(struct drm_device *dev, void *data,
                goto out_free;
 
        /* make sure all previous memory operations have passed */
-       asm volatile("mfence":::"memory");
+       DRM_MEMORYBARRIER();
 
        /* submit buffer */
        batch->start = buffers[num_buffers-1]->offset;