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@chris-wilson.co.uk :::::: CC: Chris Wilson chris@chris-wilson.co.uk

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