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Subjectdrivers/gpu/drm/i915/i915_guc_submission.c:574: error: 'b_ret' may be used uninitialized in this function
Hi,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 107df03203bb66de56e2caec3bde6d22b55480c5
commit: 0a793ad34f137f146119ec4a4a90694ccab77ea3 drm/i915: Force clean compilation with -Werror
date: 3 months ago
config: x86_64-randconfig-v0-07240812 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
git checkout 0a793ad34f137f146119ec4a4a90694ccab77ea3
# 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
drivers/gpu/drm/i915/i915_guc_submission.c: In function 'i915_guc_submit':
>> drivers/gpu/drm/i915/i915_guc_submission.c:574: error: 'b_ret' may be used uninitialized in this function
At top level:
>> cc1: error: unrecognized command line option "-Wno-maybe-uninitialized"
--
cc1: warnings being treated as errors
drivers/gpu/drm/i915/intel_sprite.c: In function 'intel_check_sprite_plane':
drivers/gpu/drm/i915/intel_sprite.c:763: error: 'src_x' may be used uninitialized in this function
drivers/gpu/drm/i915/intel_sprite.c:763: error: 'src_y' may be used uninitialized in this function
drivers/gpu/drm/i915/intel_sprite.c:763: error: 'src_w' may be used uninitialized in this function
drivers/gpu/drm/i915/intel_sprite.c:763: error: 'src_h' may be used uninitialized in this function
At top level:
>> cc1: error: unrecognized command line option "-Wno-maybe-uninitialized"
--
cc1: warnings being treated as errors
drivers/gpu/drm/i915/intel_dp.c: In function 'intel_dp_init_panel_power_sequencer':
drivers/gpu/drm/i915/intel_dp.c:5101: error: 'pp_div_reg.reg' may be used uninitialized in this function
drivers/gpu/drm/i915/intel_dp.c: In function 'intel_dp_init_panel_power_sequencer_registers':
drivers/gpu/drm/i915/intel_dp.c:5223: error: 'pp_div_reg.reg' may be used uninitialized in this function
At top level:
>> cc1: error: unrecognized command line option "-Wno-maybe-uninitialized"
--
cc1: warnings being treated as errors
drivers/gpu/drm/i915/intel_tv.c: In function 'intel_tv_detect':
>> drivers/gpu/drm/i915/intel_tv.c:1308: error: 'type' may be used uninitialized in this function
At top level:
>> cc1: error: unrecognized command line option "-Wno-maybe-uninitialized"

vim +/b_ret +574 drivers/gpu/drm/i915/i915_guc_submission.c

44a28b1d Dave Gordon 2015-08-12 558
44a28b1d Dave Gordon 2015-08-12 559 return 0;
44a28b1d Dave Gordon 2015-08-12 560 }
44a28b1d Dave Gordon 2015-08-12 561
44a28b1d Dave Gordon 2015-08-12 562 /**
44a28b1d Dave Gordon 2015-08-12 563 * i915_guc_submit() - Submit commands through GuC
44a28b1d Dave Gordon 2015-08-12 564 * @client: the guc client where commands will go through
feda33ef Alex Dai 2015-10-19 565 * @rq: request associated with the commands
44a28b1d Dave Gordon 2015-08-12 566 *
44a28b1d Dave Gordon 2015-08-12 567 * Return: 0 if succeed
44a28b1d Dave Gordon 2015-08-12 568 */
44a28b1d Dave Gordon 2015-08-12 569 int i915_guc_submit(struct i915_guc_client *client,
44a28b1d Dave Gordon 2015-08-12 570 struct drm_i915_gem_request *rq)
44a28b1d Dave Gordon 2015-08-12 571 {
44a28b1d Dave Gordon 2015-08-12 572 struct intel_guc *guc = client->guc;
4a570db5 Tvrtko Ursulin 2016-03-16 573 unsigned int engine_id = rq->engine->guc_id;
44a28b1d Dave Gordon 2015-08-12 @574 int q_ret, b_ret;
44a28b1d Dave Gordon 2015-08-12 575
44a28b1d Dave Gordon 2015-08-12 576 q_ret = guc_add_workqueue_item(client, rq);
44a28b1d Dave Gordon 2015-08-12 577 if (q_ret == 0)
44a28b1d Dave Gordon 2015-08-12 578 b_ret = guc_ring_doorbell(client);
44a28b1d Dave Gordon 2015-08-12 579
397097b0 Alex Dai 2016-01-23 580 client->submissions[engine_id] += 1;
44a28b1d Dave Gordon 2015-08-12 581 if (q_ret) {
44a28b1d Dave Gordon 2015-08-12 582 client->q_fail += 1;

:::::: The code at line 574 was first introduced by commit
:::::: 44a28b1d36762499de6fd701fcce6814eefe31d7 drm/i915: Implementation of GuC submission client

:::::: TO: Dave Gordon <david.s.gordon@intel.com>
:::::: CC: Daniel Vetter <daniel.vetter@ffwll.ch>

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