Hi Ben,

FYI, there are new sparse warnings show up in

tree: git://people.freedesktop.org/~danvet/drm-intel.git drm-intel-next-queued head: afef67fbc09aec8508c88aac1931661a36e91958 commit: a1e0e54668f41badfaf5e49cae9fc10b79635b25 [255/259] drm/i915: Stop using AGP layer for GEN6+

+ drivers/gpu/drm/i915/i915_gem_gtt.c:366:36: sparse: dereference of noderef expression

vim +366 drivers/gpu/drm/i915/i915_gem_gtt.c

a1e0e546 Ben Widawsky 2012-11-04 350 { a1e0e546 Ben Widawsky 2012-11-04 351 struct drm_device *dev = obj->base.dev; a1e0e546 Ben Widawsky 2012-11-04 352 struct drm_i915_private *dev_priv = dev->dev_private; a1e0e546 Ben Widawsky 2012-11-04 353 struct sg_table *st = obj->pages; a1e0e546 Ben Widawsky 2012-11-04 354 struct scatterlist *sg = st->sgl; a1e0e546 Ben Widawsky 2012-11-04 355 const int first_entry = obj->gtt_space->start >> PAGE_SHIFT; a1e0e546 Ben Widawsky 2012-11-04 356 const int max_entries = dev_priv->mm.gtt->gtt_total_entries - first_entry; a1e0e546 Ben Widawsky 2012-11-04 357 gtt_pte_t __iomem *gtt_entries = dev_priv->mm.gtt->gtt + first_entry; a1e0e546 Ben Widawsky 2012-11-04 358 int unused, i = 0; a1e0e546 Ben Widawsky 2012-11-04 359 unsigned int len, m = 0; a1e0e546 Ben Widawsky 2012-11-04 360 dma_addr_t addr; a1e0e546 Ben Widawsky 2012-11-04 361 a1e0e546 Ben Widawsky 2012-11-04 362 for_each_sg(st->sgl, sg, st->nents, unused) { a1e0e546 Ben Widawsky 2012-11-04 363 len = sg_dma_len(sg) >> PAGE_SHIFT; a1e0e546 Ben Widawsky 2012-11-04 364 for (m = 0; m < len; m++) { a1e0e546 Ben Widawsky 2012-11-04 365 addr = sg_dma_address(sg) + (m << PAGE_SHIFT); a1e0e546 Ben Widawsky 2012-11-04 @366 gtt_entries[i] = pte_encode(dev, addr, level); a1e0e546 Ben Widawsky 2012-11-04 367 i++; a1e0e546 Ben Widawsky 2012-11-04 368 } a1e0e546 Ben Widawsky 2012-11-04 369 } a1e0e546 Ben Widawsky 2012-11-04 370 a1e0e546 Ben Widawsky 2012-11-04 371 BUG_ON(i > max_entries); a1e0e546 Ben Widawsky 2012-11-04 372 BUG_ON(i != obj->base.size / PAGE_SIZE); a1e0e546 Ben Widawsky 2012-11-04 373 a1e0e546 Ben Widawsky 2012-11-04 374 /* XXX: This serves as a posting read to make sure that the PTE has

--- 0-DAY kernel build testing backend Open Source Technology Center Fengguang Wu, Yuanhan Liu Intel Corporation