tree: git://anongit.freedesktop.org/drm-intel for-linux-next
head: a883241c3922000b21b58b5740c55badfe09940f
commit: 0a03852e049af91da9ae70326c44bb5d9b0d377a [18/27] drm/i915: support 2M pages for the 48b PPGTT
config: x86_64-randconfig-b0-10091604 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
git checkout 0a03852e049af91da9ae70326c44bb5d9b0d377a
# save the attached .config to linux build tree
make ARCH=x86_64
All errors (new ones prefixed by >>):
cc1: warnings being treated as errors
drivers/gpu//drm/i915/i915_gem_gtt.c: In function 'intel_ppat_get':
drivers/gpu//drm/i915/i915_gem_gtt.c:2969: error: 'entry' may be used uninitialized in this function
drivers/gpu//drm/i915/i915_gem_gtt.c: In function 'gen8_ppgtt_insert_3lvl':
drivers/gpu//drm/i915/i915_gem_gtt.c:1007: error: 'iter.sg' is used uninitialized in this function
drivers/gpu//drm/i915/i915_gem_gtt.c:1008: error: 'iter.dma' may be used uninitialized in this function
drivers/gpu//drm/i915/i915_gem_gtt.c: In function 'gen8_ppgtt_insert_4lvl':
>> drivers/gpu//drm/i915/i915_gem_gtt.c:1087: error: 'iter' is used uninitialized in this function
vim +/iter +1087 drivers/gpu//drm/i915/i915_gem_gtt.c
0a03852e0 Matthew Auld 2017-10-06 1078
894ccebee Chris Wilson 2017-02-15 1079 static void gen8_ppgtt_insert_4lvl(struct i915_address_space *vm,
4a234c5fa Matthew Auld 2017-06-22 1080 struct i915_vma *vma,
894ccebee Chris Wilson 2017-02-15 1081 enum i915_cache_level cache_level,
894ccebee Chris Wilson 2017-02-15 1082 u32 unused)
894ccebee Chris Wilson 2017-02-15 1083 {
894ccebee Chris Wilson 2017-02-15 1084 struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
894ccebee Chris Wilson 2017-02-15 1085 struct sgt_dma iter = {
4a234c5fa Matthew Auld 2017-06-22 1086 .sg = vma->pages->sgl,
894ccebee Chris Wilson 2017-02-15 @1087 .dma = sg_dma_address(iter.sg),
894ccebee Chris Wilson 2017-02-15 1088 .max = iter.dma + iter.sg->length,
894ccebee Chris Wilson 2017-02-15 1089 };
894ccebee Chris Wilson 2017-02-15 1090 struct i915_page_directory_pointer **pdps = ppgtt->pml4.pdps;
0a03852e0 Matthew Auld 2017-10-06 1091
0a03852e0 Matthew Auld 2017-10-06 1092 if (vma->page_sizes.sg > I915_GTT_PAGE_SIZE) {
0a03852e0 Matthew Auld 2017-10-06 1093 gen8_ppgtt_insert_huge_entries(vma, pdps, &iter, cache_level);
0a03852e0 Matthew Auld 2017-10-06 1094 } else {
4a234c5fa Matthew Auld 2017-06-22 1095 struct gen8_insert_pte idx = gen8_insert_pte(vma->node.start);
894ccebee Chris Wilson 2017-02-15 1096
0a03852e0 Matthew Auld 2017-10-06 1097 while (gen8_ppgtt_insert_pte_entries(ppgtt, pdps[idx.pml4e++],
0a03852e0 Matthew Auld 2017-10-06 1098 &iter, &idx, cache_level))
9e89f9ee3 Chris Wilson 2017-02-25 1099 GEM_BUG_ON(idx.pml4e >= GEN8_PML4ES_PER_PML4);
f9b5b782c Michel Thierry 2015-07-30 1100 }
0a03852e0 Matthew Auld 2017-10-06 1101 }
f9b5b782c Michel Thierry 2015-07-30 1102
:::::: The code at line 1087 was first introduced by commit
:::::: 894ccebee2b0e606ba9638d20dd87b33568482d7 drm/i915: Micro-optimise gen8_ppgtt_insert_entries()
:::::: TO: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
:::::: CC: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
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