[kbuild-all] drivers/gpu/drm/i915/gem/i915_gem_region.c:166:27: warning: Uninitialized variable: obj

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 1d94330a437a573cfdf848f6743b1ed169242c8a commit: c6d4a099a240a8742173f8e02db0ba08ffd37ef1 drm/i915: reimplement header test feature date: 1 year ago compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; "cppcheck warnings: (new ones prefixed by >>)" if (overflows_type(size, obj->base.size)) ^ -- cppcheck possible warnings: (new ones prefixed by >>, may not real problems) flags |= DST_KEY_ENABLE; ^ vim +166 drivers/gpu/drm/i915/gem/i915_gem_region.c 232a6ebae41919 Matthew Auld 2019-10-08 132 232a6ebae41919 Matthew Auld 2019-10-08 133 struct drm_i915_gem_object * 232a6ebae41919 Matthew Auld 2019-10-08 134 i915_gem_object_create_region(struct intel_memory_region *mem, 232a6ebae41919 Matthew Auld 2019-10-08 135 resource_size_t size, 232a6ebae41919 Matthew Auld 2019-10-08 136 unsigned int flags) 232a6ebae41919 Matthew Auld 2019-10-08 137 { 232a6ebae41919 Matthew Auld 2019-10-08 138 struct drm_i915_gem_object *obj; 232a6ebae41919 Matthew Auld 2019-10-08 139 232a6ebae41919 Matthew Auld 2019-10-08 140 /* 232a6ebae41919 Matthew Auld 2019-10-08 141 * NB: Our use of resource_size_t for the size stems from using struct 232a6ebae41919 Matthew Auld 2019-10-08 142 * resource for the mem->region. We might need to revisit this in the 232a6ebae41919 Matthew Auld 2019-10-08 143 * future. 232a6ebae41919 Matthew Auld 2019-10-08 144 */ 232a6ebae41919 Matthew Auld 2019-10-08 145 2f0b97ca021186 Matthew Auld 2019-10-08 146 GEM_BUG_ON(flags & ~I915_BO_ALLOC_FLAGS); 2f0b97ca021186 Matthew Auld 2019-10-08 147 232a6ebae41919 Matthew Auld 2019-10-08 148 if (!mem) 232a6ebae41919 Matthew Auld 2019-10-08 149 return ERR_PTR(-ENODEV); 232a6ebae41919 Matthew Auld 2019-10-08 150 232a6ebae41919 Matthew Auld 2019-10-08 151 size = round_up(size, mem->min_page_size); 232a6ebae41919 Matthew Auld 2019-10-08 152 232a6ebae41919 Matthew Auld 2019-10-08 153 GEM_BUG_ON(!size); 232a6ebae41919 Matthew Auld 2019-10-08 154 GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_MIN_ALIGNMENT)); 232a6ebae41919 Matthew Auld 2019-10-08 155 232a6ebae41919 Matthew Auld 2019-10-08 156 /* 232a6ebae41919 Matthew Auld 2019-10-08 157 * XXX: There is a prevalence of the assumption that we fit the 232a6ebae41919 Matthew Auld 2019-10-08 158 * object's page count inside a 32bit _signed_ variable. Let's document 232a6ebae41919 Matthew Auld 2019-10-08 159 * this and catch if we ever need to fix it. In the meantime, if you do 232a6ebae41919 Matthew Auld 2019-10-08 160 * spot such a local variable, please consider fixing! 232a6ebae41919 Matthew Auld 2019-10-08 161 */ 232a6ebae41919 Matthew Auld 2019-10-08 162 232a6ebae41919 Matthew Auld 2019-10-08 163 if (size >> PAGE_SHIFT > INT_MAX) 232a6ebae41919 Matthew Auld 2019-10-08 164 return ERR_PTR(-E2BIG); 232a6ebae41919 Matthew Auld 2019-10-08 165 232a6ebae41919 Matthew Auld 2019-10-08 @166 if (overflows_type(size, obj->base.size)) :::::: The code at line 166 was first introduced by commit :::::: 232a6ebae419193f5b8da4fa869ae5089ab105c2 drm/i915: introduce intel_memory_region :::::: TO: Matthew Auld <matthew.auld(a)intel.com&gt; :::::: CC: Chris Wilson <chris(a)chris-wilson.co.uk&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org