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

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