X-Git-Url: http://git.monstr.eu/?a=blobdiff_plain;f=drivers%2Fgpu%2Fdrm%2Fi915%2Fgem%2Fi915_gem_pages.c;h=d6eeefab3d018bc2e295b2053750acf84fd9c30f;hb=ba2ebf605d5f32a9be0f7b05d3174bbc501b83fe;hp=49ce5777c51152804046b98d804922c311fc43b4;hpb=4caf017ee93703ba1c4504f3d73b50e6bbd4249e;p=linux-2.6-microblaze.git

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
index 49ce5777c511..d6eeefab3d01 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_pages.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
@@ -254,6 +254,10 @@ static void *i915_gem_object_map(struct drm_i915_gem_object *obj,
 	if (!i915_gem_object_has_struct_page(obj) && type != I915_MAP_WC)
 		return NULL;
 
+	if (GEM_WARN_ON(type == I915_MAP_WC &&
+			!static_cpu_has(X86_FEATURE_PAT)))
+		return NULL;
+
 	/* A single page can always be kmapped */
 	if (n_pte == 1 && type == I915_MAP_WB) {
 		struct page *page = sg_page(sgt->sgl);