Re: [Intel-gfx] [PATCH 12/26] drm/i915/guc: Implement multi-lrc submission

[kernel test robot <lkp@intel.com>]

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Hi Matthew,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on drm-tip/drm-tip]
[cannot apply to drm-intel/for-linux-next drm-exynos/exynos-drm-next tegra-drm/drm/tegra/for-next linus/master airlied/drm-next v5.15-rc3 next-20210922]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Matthew-Brost/Parallel-submission-aka-multi-bb-execbuf/20211005-061424
base:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
config: x86_64-randconfig-a003-20211004 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c0039de2953d15815448b4b3c3bafb45607781e0)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/3bea3cc438df1105d0d8c1bcc01b96559d4bb78c
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Matthew-Brost/Parallel-submission-aka-multi-bb-execbuf/20211005-061424
        git checkout 3bea3cc438df1105d0d8c1bcc01b96559d4bb78c
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c:1486:7: error: variable 'ret' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
                   if (multi_lrc_submit(rq)) {
                       ^~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c:1499:9: note: uninitialized use occurs here
           return ret;
                  ^~~
   drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c:1486:3: note: remove the 'if' if its condition is always true
                   if (multi_lrc_submit(rq)) {
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c:1479:9: note: initialize the variable 'ret' to silence this warning
           int ret;
                  ^
                   = 0
   1 error generated.


vim +1486 drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c

  1475	
  1476	static int guc_bypass_tasklet_submit(struct intel_guc *guc,
  1477					     struct i915_request *rq)
  1478	{
  1479		int ret;
  1480	
  1481		__i915_request_submit(rq);
  1482	
  1483		trace_i915_request_in(rq, 0);
  1484	
  1485		if (is_multi_lrc_rq(rq)) {
> 1486			if (multi_lrc_submit(rq)) {
  1487				ret = guc_wq_item_append(guc, rq);
  1488				if (!ret)
  1489					ret = guc_add_request(guc, rq);
  1490			}
  1491		} else {
  1492			guc_set_lrc_tail(rq);
  1493			ret = guc_add_request(guc, rq);
  1494		}
  1495	
  1496		if (unlikely(ret == -EPIPE))
  1497			disable_submission(guc);
  1498	
  1499		return ret;
  1500	}
  1501	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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