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/gma500/psb_irq.c b/drivers/gpu/drm/gma500/psb_irq.c
index ef00bce..a9bb347 100644
--- a/drivers/gpu/drm/gma500/psb_irq.c
+++ b/drivers/gpu/drm/gma500/psb_irq.c
@@ -253,7 +253,7 @@
 
 	PSB_WVDC32(vdc_stat, PSB_INT_IDENTITY_R);
 	(void) PSB_RVDC32(PSB_INT_IDENTITY_R);
-	DRM_READMEMORYBARRIER();
+	rmb();
 
 	if (!handled)
 		return IRQ_NONE;