[drm-intel:drm-intel-next-queued 31/59] drivers/gpu/drm/i915/selftests/i915_gem_coherency.c:274: error: 'err' may be used uninitialized in this function

[kbuild test robot]

tree:   git://anongit.freedesktop.org/drm-intel drm-intel-next-queued
head:   d892e9398ecf6defc7972a62227b77dad6be20bd
commit: 170594502cf591fd0789d7e5239937b1a87af4c6 [31/59] drm/i915: Test coherency of and barriers between cache domains
config: x86_64-randconfig-s2-02141638 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
        git checkout 170594502cf591fd0789d7e5239937b1a87af4c6
        # save the attached .config to linux build tree
        make ARCH=x86_64 

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All errors (new ones prefixed by >>):

   cc1: warnings being treated as errors
   In file included from drivers/gpu/drm/i915/i915_gem.c:5029:
   drivers/gpu/drm/i915/selftests/i915_gem_coherency.c: In function 'igt_gem_coherency':
>> drivers/gpu/drm/i915/selftests/i915_gem_coherency.c:274: error: 'err' may be used uninitialized in this function
   drivers/gpu/drm/i915/i915_gem.c: In function 'i915_gem_object_map':
   drivers/gpu/drm/i915/i915_gem.c:2467: error: 'pgprot.pgprot' may be used uninitialized in this function

vim +/err +274 drivers/gpu/drm/i915/selftests/i915_gem_coherency.c

   268		I915_RND_STATE(prng);
   269		struct drm_i915_private *i915 = arg;
   270		const struct igt_coherency_mode *read, *write, *over;
   271		struct drm_i915_gem_object *obj;
   272		unsigned long count, n;
   273		u32 *offsets, *values;
 > 274		int err;
   275	
   276		/* We repeatedly write, overwrite and read from a sequence of
   277		 * cachelines in order to try and detect incoherency (unflushed writes

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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