[drm-tip:drm-tip /8] drivers/gpu/drm/i915/i915_request.c:842:1: error: redefinition of 'already_busywaiting'

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tree:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
head:   ae28cc6cf80a2e8cbb58f255ef7cac6b2923c98a
commit: 47f4a14297839cb4cedd725fb916a5da5eb9b5ba [/8] Merge remote-tracking branch 'drm-intel/drm-intel-next-queued' into drm-tip
config: x86_64-rhel (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout 47f4a14297839cb4cedd725fb916a5da5eb9b5ba
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

Note: the drm-tip/drm-tip HEAD ae28cc6cf80a2e8cbb58f255ef7cac6b2923c98a builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   drivers/gpu/drm/i915/i915_request.c:827:1: error: redefinition of 'i915_request_await_start'
    i915_request_await_start(struct i915_request *rq, struct i915_request *signal)
    ^~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/i915/i915_request.c:794:1: note: previous definition of 'i915_request_await_start' was here
    i915_request_await_start(struct i915_request *rq, struct i915_request *signal)
    ^~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/gpu/drm/i915/i915_request.c:842:1: error: redefinition of 'already_busywaiting'
    already_busywaiting(struct i915_request *rq)
    ^~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/i915/i915_request.c:809:1: note: previous definition of 'already_busywaiting' was here
    already_busywaiting(struct i915_request *rq)
    ^~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/i915/i915_request.c:809:1: warning: 'already_busywaiting' defined but not used [-Wunused-function]
   drivers/gpu/drm/i915/i915_request.c:794:1: warning: 'i915_request_await_start' defined but not used [-Wunused-function]
    i915_request_await_start(struct i915_request *rq, struct i915_request *signal)
    ^~~~~~~~~~~~~~~~~~~~~~~~

vim +/already_busywaiting +842 drivers/gpu/drm/i915/i915_request.c

47f4a1429 drivers/gpu/drm/i915/i915_request.c     Joonas Lahtinen 2019-05-07  825  
a2bc4695b drivers/gpu/drm/i915/i915_gem_request.c Chris Wilson    2016-09-09  826  static int
e766fde65 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-01 @827  i915_request_await_start(struct i915_request *rq, struct i915_request *signal)
e766fde65 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-01  828  {
e766fde65 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-01  829  	if (list_is_first(&signal->ring_link, &signal->ring->request_list))
e766fde65 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-01  830  		return 0;
e766fde65 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-01  831  
e766fde65 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-01  832  	signal = list_prev_entry(signal, ring_link);
e766fde65 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-01  833  	if (i915_timeline_sync_is_later(rq->timeline, &signal->fence))
e766fde65 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-01  834  		return 0;
e766fde65 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-01  835  
e766fde65 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-01  836  	return i915_sw_fence_await_dma_fence(&rq->submit,
e766fde65 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-01  837  					     &signal->fence, 0,
e766fde65 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-01  838  					     I915_FENCE_GFP);
e766fde65 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-01  839  }
e766fde65 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-01  840  
2564fe708 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-04  841  static intel_engine_mask_t
2564fe708 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-04 @842  already_busywaiting(struct i915_request *rq)
2564fe708 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-04  843  {
2564fe708 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-04  844  	/*
2564fe708 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-04  845  	 * Polling a semaphore causes bus traffic, delaying other users of
2564fe708 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-04  846  	 * both the GPU and CPU. We want to limit the impact on others,
2564fe708 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-04  847  	 * while taking advantage of early submission to reduce GPU
2564fe708 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-04  848  	 * latency. Therefore we restrict ourselves to not using more
2564fe708 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-04  849  	 * than one semaphore from each source, and not using a semaphore
2564fe708 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-04  850  	 * if we have detected the engine is saturated (i.e. would not be
2564fe708 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-04  851  	 * submitted early and cause bus traffic reading an already passed
2564fe708 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-04  852  	 * semaphore).
2564fe708 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-04  853  	 *
2564fe708 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-04  854  	 * See the are-we-too-late? check in __i915_request_submit().
2564fe708 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-04  855  	 */
2564fe708 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-04  856  	return rq->sched.semaphores | rq->hw_context->saturated;
2564fe708 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-04  857  }
2564fe708 drivers/gpu/drm/i915/i915_request.c     Chris Wilson    2019-05-04  858  

:::::: The code at line 842 was first introduced by commit
:::::: 2564fe708b580c1ef12b2b527ab6e8afe11ad444 drm/i915: Disable semaphore busywaits on saturated systems

:::::: TO: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
:::::: CC: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>

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

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