linux-kernel - drivers/gpu/drm/i915/selftests/i915_gem_request.c:280: error: 'request' may be used uninitialized in this function

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Date:   Sun, 28 May 2017 13:18:37 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Chris Wilson <chris@...is-wilson.co.uk>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
Subject: drivers/gpu/drm/i915/selftests/i915_gem_request.c:280: error:
 'request' may be used uninitialized in this function

Hi Chris,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   249f1efd8e3d58f86469fc305b0eda39db18d7ce
commit: b348090d6758cc391dc91f8a8233b18f0acc8458 drm/i915: Simple selftest to exercise live requests
date:   3 months ago
config: x86_64-randconfig-b0-05281108 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
        git checkout b348090d6758cc391dc91f8a8233b18f0acc8458
        # 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_request.c:1204:
   drivers/gpu/drm/i915/selftests/i915_gem_request.c: In function 'live_nop_request':
>> drivers/gpu/drm/i915/selftests/i915_gem_request.c:280: error: 'request' may be used uninitialized in this function

vim +/request +280 drivers/gpu/drm/i915/selftests/i915_gem_request.c

   274		 */
   275	
   276		mutex_lock(&i915->drm.struct_mutex);
   277	
   278		for_each_engine(engine, i915, id) {
   279			IGT_TIMEOUT(end_time);
 > 280			struct drm_i915_gem_request *request;
   281			unsigned long n, prime;
   282			ktime_t times[2] = {};
   283	

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