drm/radeon: allow selection of alignment in the sub-allocator

There are cases where we need more than 4k alignment.  No
functional change with this commit.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c
index 5f1c51a..fb5ea62 100644
--- a/drivers/gpu/drm/radeon/radeon_ring.c
+++ b/drivers/gpu/drm/radeon/radeon_ring.c
@@ -224,6 +224,7 @@
 	}
 	r = radeon_sa_bo_manager_init(rdev, &rdev->ring_tmp_bo,
 				      RADEON_IB_POOL_SIZE*64*1024,
+				      RADEON_GPU_PAGE_SIZE,
 				      RADEON_GEM_DOMAIN_GTT);
 	if (r) {
 		return r;