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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BDW] igt_ppgtt_shrink, OOPS gen8_ppgtt_insert_4lvl"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99948#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [BDW] igt_ppgtt_shrink, OOPS gen8_ppgtt_insert_4lvl"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99948">bug 99948</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>and
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
index 8e33a8bde78a..187444c37bbb 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
@@ -62,12 +62,14 @@ fake_get_pages(struct drm_i915_gem_object *obj)
for (sg = pages->sgl; sg; sg = sg_next(sg)) {
unsigned long len = min_t(typeof(rem), rem, BIT(31));
+ GEM_BUG_ON(!len);
sg_set_page(sg, pfn_to_page(PFN_BIAS), len, 0);
sg_dma_address(sg) = page_to_phys(sg_page(sg));
sg_dma_len(sg) = len;
rem -= len;
}
+ GEM_BUG_ON(rem);
obj->mm.madv = I915_MADV_DONTNEED;
return pages;</pre>
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