Hi Chris,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on drm-tip/drm-tip]
[cannot apply to drm-intel/for-linux-next v5.10 next-20201214]
[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/Chris-Wilson/drm-i915-Use-cmpxchg64-for-32b-compatilibity/20201214-181222
base:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
config: i386-randconfig-s002-20201214 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-184-g1b896707-dirty
        # https://github.com/0day-ci/linux/commit/44f806e9c54f1723714820d49dda7beddc38aa1e
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Chris-Wilson/drm-i915-Use-cmpxchg64-for-32b-compatilibity/20201214-181222
        git checkout 44f806e9c54f1723714820d49dda7beddc38aa1e
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 

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


"sparse warnings: (new ones prefixed by >>)"
>> drivers/gpu/drm/i915/gt/intel_execlists_submission.c:1401:37: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct intel_timeline *tl @@     got struct intel_timeline [noderef] __rcu * @@
   drivers/gpu/drm/i915/gt/intel_execlists_submission.c:1401:37: sparse:     expected struct intel_timeline *tl
   drivers/gpu/drm/i915/gt/intel_execlists_submission.c:1401:37: sparse:     got struct intel_timeline [noderef] __rcu *

vim +1401 drivers/gpu/drm/i915/gt/intel_execlists_submission.c

  1396	
  1397	static void
  1398	resubmit_virtual_request(struct i915_request *rq, struct virtual_engine *ve)
  1399	{
  1400		struct intel_engine_cs *engine = rq->engine;
> 1401		struct intel_timeline *tl = READ_ONCE(rq->timeline);
  1402		struct i915_request *pos = rq;
  1403	
  1404		spin_lock_irq(&engine->active.lock);
  1405	
  1406		/* Rewind back to the start of this virtual engine queue */
  1407		list_for_each_entry_continue_reverse(rq, &tl->requests, link) {
  1408			if (i915_request_completed(rq))
  1409				break;
  1410	
  1411			pos = rq;
  1412		}
  1413	
  1414		/* Resubmit the queue in execution order */
  1415		spin_lock(&ve->base.active.lock);
  1416		list_for_each_entry_from(pos, &tl->requests, link) {
  1417			if (pos->engine != engine)
  1418				break;
  1419	
  1420			__resubmit_virtual_request(pos, engine, ve);
  1421		}
  1422		spin_unlock(&ve->base.active.lock);
  1423	
  1424		spin_unlock_irq(&engine->active.lock);
  1425	}
  1426	

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