drm: Kill DRM_*MEMORYBARRIER

The real linux interfaces are soooo much easier on the eyes ...

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/via/via_dma.c b/drivers/gpu/drm/via/via_dma.c
index 3436fda..5d41792 100644
--- a/drivers/gpu/drm/via/via_dma.c
+++ b/drivers/gpu/drm/via/via_dma.c
@@ -60,7 +60,7 @@
 	dev_priv->dma_low += 8;					\
 }
 
-#define via_flush_write_combine() DRM_MEMORYBARRIER()
+#define via_flush_write_combine() mb()
 
 #define VIA_OUT_RING_QW(w1, w2)	do {		\
 	*vb++ = (w1);				\
@@ -543,7 +543,7 @@
 
 	VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_hi);
 	VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_lo);
-	DRM_WRITEMEMORYBARRIER();
+	wmb();
 	VIA_WRITE(VIA_REG_TRANSPACE, command | HC_HAGPCMNT_MASK);
 	VIA_READ(VIA_REG_TRANSPACE);