[Intel-gfx] [PATCH] drm/i915/pmu: Keep a reference to module while active

[Intel-gfx] [PATCH] drm/i915/pmu: Keep a reference to module while active

[Chris Wilson]

While a perf event is open, keep a reference to the module so we don't
remove the driver internals mid-sampling.

Testcase: igt/perf_pmu/module-unload
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: stable@vger.kernel.org
---
 drivers/gpu/drm/i915/i915_pmu.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index 83c6a8ccd2cb..e991a707bdb7 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -442,6 +442,7 @@ static u64 count_interrupts(struct drm_i915_private *i915)
 static void i915_pmu_event_destroy(struct perf_event *event)
 {
 	WARN_ON(event->parent);
+	module_put(THIS_MODULE);
 }
 
 static int
@@ -533,8 +534,10 @@ static int i915_pmu_event_init(struct perf_event *event)
 	if (ret)
 		return ret;
 
-	if (!event->parent)
+	if (!event->parent) {
+		__module_get(THIS_MODULE);
 		event->destroy = i915_pmu_event_destroy;
+	}
 
 	return 0;
 }
-- 
2.20.1

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[Intel-gfx] ✓ Fi.CI.BAT: success for drm/i915/pmu: Keep a reference to module while active

[Patchwork]

== Series Details ==

Series: drm/i915/pmu: Keep a reference to module while active
URL   : https://patchwork.freedesktop.org/series/76779/
State : success

== Summary ==

CI Bug Log - changes from CI_DRM_8402 -> Patchwork_17530
====================================================

Summary
-------

  **SUCCESS**

  No regressions found.

  External URL: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/index.html

Known issues
------------

  Here are the changes found in Patchwork_17530 that come from known issues:

### IGT changes ###

#### Issues hit ####

  * igt@i915_selftest@live@gt_pm:
    - fi-bwr-2160:        [PASS][1] -> [INCOMPLETE][2] ([i915#489])
   [1]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/fi-bwr-2160/igt@i915_selftest@live@gt_pm.html
   [2]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/fi-bwr-2160/igt@i915_selftest@live@gt_pm.html

  
#### Possible fixes ####

  * igt@kms_chamelium@dp-edid-read:
    - fi-cml-u2:          [FAIL][3] ([i915#976]) -> [PASS][4]
   [3]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/fi-cml-u2/igt@kms_chamelium@dp-edid-read.html
   [4]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/fi-cml-u2/igt@kms_chamelium@dp-edid-read.html

  
#### Warnings ####

  * igt@i915_pm_rpm@module-reload:
    - fi-kbl-x1275:       [SKIP][5] ([fdo#109271]) -> [FAIL][6] ([i915#62])
   [5]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/fi-kbl-x1275/igt@i915_pm_rpm@module-reload.html
   [6]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/fi-kbl-x1275/igt@i915_pm_rpm@module-reload.html

  
  [fdo#109271]: https://bugs.freedesktop.org/show_bug.cgi?id=109271
  [i915#489]: https://gitlab.freedesktop.org/drm/intel/issues/489
  [i915#62]: https://gitlab.freedesktop.org/drm/intel/issues/62
  [i915#976]: https://gitlab.freedesktop.org/drm/intel/issues/976


Participating hosts (51 -> 44)
------------------------------

  Missing    (7): fi-ilk-m540 fi-hsw-4200u fi-byt-squawks fi-bsw-cyan fi-ctg-p8600 fi-byt-clapper fi-bdw-samus 


Build changes
-------------

  * CI: CI-20190529 -> None
  * Linux: CI_DRM_8402 -> Patchwork_17530

  CI-20190529: 20190529
  CI_DRM_8402: b34c04ed51aaaab63716e7491db86c83aab4e095 @ git://anongit.freedesktop.org/gfx-ci/linux
  IGT_5618: 9a94fb4b5ebb82185fb52a1709366458597a62ab @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
  Patchwork_17530: 18e8c538bd2efa06a6622a012dd2eb86d823c2a5 @ git://anongit.freedesktop.org/gfx-ci/linux


== Linux commits ==

18e8c538bd2e drm/i915/pmu: Keep a reference to module while active

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/index.html
_______________________________________________
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Intel-gfx@lists.freedesktop.org
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[Intel-gfx] ✗ Fi.CI.IGT: failure for drm/i915/pmu: Keep a reference to module while active

[Patchwork]

== Series Details ==

Series: drm/i915/pmu: Keep a reference to module while active
URL   : https://patchwork.freedesktop.org/series/76779/
State : failure

== Summary ==

CI Bug Log - changes from CI_DRM_8402_full -> Patchwork_17530_full
====================================================

Summary
-------

  **FAILURE**

  Serious unknown changes coming with Patchwork_17530_full absolutely need to be
  verified manually.
  
  If you think the reported changes have nothing to do with the changes
  introduced in Patchwork_17530_full, please notify your bug team to allow them
  to document this new failure mode, which will reduce false positives in CI.

  

Possible new issues
-------------------

  Here are the unknown changes that may have been introduced in Patchwork_17530_full:

### IGT changes ###

#### Possible regressions ####

  * igt@gem_ctx_shared@q-smoketest-all:
    - shard-tglb:         [PASS][1] -> [INCOMPLETE][2]
   [1]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-tglb8/igt@gem_ctx_shared@q-smoketest-all.html
   [2]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-tglb2/igt@gem_ctx_shared@q-smoketest-all.html

  
Known issues
------------

  Here are the changes found in Patchwork_17530_full that come from known issues:

### IGT changes ###

#### Issues hit ####

  * igt@gem_exec_suspend@basic-s3:
    - shard-kbl:          [PASS][3] -> [DMESG-WARN][4] ([i915#180])
   [3]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-kbl3/igt@gem_exec_suspend@basic-s3.html
   [4]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-kbl1/igt@gem_exec_suspend@basic-s3.html

  * igt@gen9_exec_parse@allowed-all:
    - shard-kbl:          [PASS][5] -> [DMESG-WARN][6] ([i915#1436] / [i915#716] / [i915#93] / [i915#95])
   [5]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-kbl1/igt@gen9_exec_parse@allowed-all.html
   [6]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-kbl3/igt@gen9_exec_parse@allowed-all.html

  * igt@kms_cursor_crc@pipe-a-cursor-64x64-onscreen:
    - shard-kbl:          [PASS][7] -> [FAIL][8] ([i915#54] / [i915#93] / [i915#95])
   [7]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-kbl4/igt@kms_cursor_crc@pipe-a-cursor-64x64-onscreen.html
   [8]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-kbl4/igt@kms_cursor_crc@pipe-a-cursor-64x64-onscreen.html

  * igt@kms_cursor_crc@pipe-a-cursor-suspend:
    - shard-apl:          [PASS][9] -> [DMESG-WARN][10] ([i915#180] / [i915#95])
   [9]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-apl3/igt@kms_cursor_crc@pipe-a-cursor-suspend.html
   [10]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-apl2/igt@kms_cursor_crc@pipe-a-cursor-suspend.html

  * igt@kms_draw_crc@draw-method-rgb565-render-ytiled:
    - shard-glk:          [PASS][11] -> [FAIL][12] ([i915#52] / [i915#54])
   [11]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-glk2/igt@kms_draw_crc@draw-method-rgb565-render-ytiled.html
   [12]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-glk1/igt@kms_draw_crc@draw-method-rgb565-render-ytiled.html

  * igt@kms_hdr@bpc-switch-suspend:
    - shard-skl:          [PASS][13] -> [FAIL][14] ([i915#1188]) +1 similar issue
   [13]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-skl10/igt@kms_hdr@bpc-switch-suspend.html
   [14]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-skl10/igt@kms_hdr@bpc-switch-suspend.html

  * igt@kms_plane@plane-panning-bottom-right-suspend-pipe-a-planes:
    - shard-apl:          [PASS][15] -> [DMESG-WARN][16] ([i915#180])
   [15]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-apl3/igt@kms_plane@plane-panning-bottom-right-suspend-pipe-a-planes.html
   [16]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-apl6/igt@kms_plane@plane-panning-bottom-right-suspend-pipe-a-planes.html

  * igt@kms_plane_alpha_blend@pipe-c-constant-alpha-min:
    - shard-skl:          [PASS][17] -> [FAIL][18] ([fdo#108145] / [i915#265])
   [17]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-skl6/igt@kms_plane_alpha_blend@pipe-c-constant-alpha-min.html
   [18]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-skl2/igt@kms_plane_alpha_blend@pipe-c-constant-alpha-min.html

  * igt@kms_plane_lowres@pipe-a-tiling-x:
    - shard-glk:          [PASS][19] -> [FAIL][20] ([i915#899])
   [19]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-glk8/igt@kms_plane_lowres@pipe-a-tiling-x.html
   [20]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-glk4/igt@kms_plane_lowres@pipe-a-tiling-x.html

  * igt@kms_psr@psr2_no_drrs:
    - shard-iclb:         [PASS][21] -> [SKIP][22] ([fdo#109441]) +3 similar issues
   [21]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-iclb2/igt@kms_psr@psr2_no_drrs.html
   [22]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-iclb1/igt@kms_psr@psr2_no_drrs.html

  
#### Possible fixes ####

  * igt@kms_cursor_legacy@pipe-d-torture-move:
    - shard-tglb:         [DMESG-WARN][23] ([i915#128]) -> [PASS][24]
   [23]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-tglb7/igt@kms_cursor_legacy@pipe-d-torture-move.html
   [24]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-tglb7/igt@kms_cursor_legacy@pipe-d-torture-move.html

  * igt@kms_draw_crc@draw-method-rgb565-pwrite-xtiled:
    - shard-glk:          [FAIL][25] ([i915#52] / [i915#54]) -> [PASS][26]
   [25]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-glk5/igt@kms_draw_crc@draw-method-rgb565-pwrite-xtiled.html
   [26]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-glk4/igt@kms_draw_crc@draw-method-rgb565-pwrite-xtiled.html

  * {igt@kms_flip@plain-flip-fb-recreate@c-edp1}:
    - shard-skl:          [FAIL][27] ([i915#34]) -> [PASS][28]
   [27]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-skl10/igt@kms_flip@plain-flip-fb-recreate@c-edp1.html
   [28]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-skl10/igt@kms_flip@plain-flip-fb-recreate@c-edp1.html

  * igt@kms_frontbuffer_tracking@psr-1p-primscrn-cur-indfb-draw-blt:
    - shard-skl:          [FAIL][29] ([i915#49]) -> [PASS][30]
   [29]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-skl6/igt@kms_frontbuffer_tracking@psr-1p-primscrn-cur-indfb-draw-blt.html
   [30]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-skl2/igt@kms_frontbuffer_tracking@psr-1p-primscrn-cur-indfb-draw-blt.html

  * igt@kms_hdr@bpc-switch-dpms:
    - shard-skl:          [FAIL][31] ([i915#1188]) -> [PASS][32]
   [31]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-skl5/igt@kms_hdr@bpc-switch-dpms.html
   [32]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-skl8/igt@kms_hdr@bpc-switch-dpms.html

  * igt@kms_pipe_crc_basic@suspend-read-crc-pipe-a:
    - shard-kbl:          [DMESG-WARN][33] ([i915#180]) -> [PASS][34] +3 similar issues
   [33]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-kbl1/igt@kms_pipe_crc_basic@suspend-read-crc-pipe-a.html
   [34]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-kbl1/igt@kms_pipe_crc_basic@suspend-read-crc-pipe-a.html

  * igt@kms_plane@plane-panning-bottom-right-suspend-pipe-b-planes:
    - shard-apl:          [DMESG-WARN][35] ([i915#180]) -> [PASS][36] +6 similar issues
   [35]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-apl1/igt@kms_plane@plane-panning-bottom-right-suspend-pipe-b-planes.html
   [36]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-apl3/igt@kms_plane@plane-panning-bottom-right-suspend-pipe-b-planes.html

  * igt@kms_plane_alpha_blend@pipe-c-coverage-7efc:
    - shard-skl:          [FAIL][37] ([fdo#108145] / [i915#265]) -> [PASS][38] +1 similar issue
   [37]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-skl8/igt@kms_plane_alpha_blend@pipe-c-coverage-7efc.html
   [38]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-skl5/igt@kms_plane_alpha_blend@pipe-c-coverage-7efc.html

  * igt@kms_psr@psr2_cursor_mmap_cpu:
    - shard-iclb:         [SKIP][39] ([fdo#109441]) -> [PASS][40] +2 similar issues
   [39]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-iclb1/igt@kms_psr@psr2_cursor_mmap_cpu.html
   [40]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-iclb2/igt@kms_psr@psr2_cursor_mmap_cpu.html

  * {igt@perf@blocking-parameterized}:
    - shard-hsw:          [FAIL][41] ([i915#1542]) -> [PASS][42]
   [41]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-hsw6/igt@perf@blocking-parameterized.html
   [42]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-hsw4/igt@perf@blocking-parameterized.html
    - shard-tglb:         [FAIL][43] ([i915#1542]) -> [PASS][44]
   [43]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-tglb5/igt@perf@blocking-parameterized.html
   [44]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-tglb3/igt@perf@blocking-parameterized.html

  
#### Warnings ####

  * igt@i915_pm_dc@dc3co-vpb-simulation:
    - shard-iclb:         [SKIP][45] ([i915#588]) -> [SKIP][46] ([i915#658])
   [45]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-iclb2/igt@i915_pm_dc@dc3co-vpb-simulation.html
   [46]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-iclb6/igt@i915_pm_dc@dc3co-vpb-simulation.html

  * igt@i915_pm_rpm@pm-caching:
    - shard-snb:          [SKIP][47] ([fdo#109271]) -> [INCOMPLETE][48] ([i915#82])
   [47]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-snb2/igt@i915_pm_rpm@pm-caching.html
   [48]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-snb4/igt@i915_pm_rpm@pm-caching.html

  * igt@kms_plane_alpha_blend@pipe-b-alpha-basic:
    - shard-apl:          [FAIL][49] ([fdo#108145] / [i915#265]) -> [FAIL][50] ([fdo#108145] / [i915#265] / [i915#95])
   [49]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8402/shard-apl2/igt@kms_plane_alpha_blend@pipe-b-alpha-basic.html
   [50]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/shard-apl4/igt@kms_plane_alpha_blend@pipe-b-alpha-basic.html

  
  {name}: This element is suppressed. This means it is ignored when computing
          the status of the difference (SUCCESS, WARNING, or FAILURE).

  [fdo#108145]: https://bugs.freedesktop.org/show_bug.cgi?id=108145
  [fdo#109271]: https://bugs.freedesktop.org/show_bug.cgi?id=109271
  [fdo#109441]: https://bugs.freedesktop.org/show_bug.cgi?id=109441
  [i915#1188]: https://gitlab.freedesktop.org/drm/intel/issues/1188
  [i915#128]: https://gitlab.freedesktop.org/drm/intel/issues/128
  [i915#1436]: https://gitlab.freedesktop.org/drm/intel/issues/1436
  [i915#1542]: https://gitlab.freedesktop.org/drm/intel/issues/1542
  [i915#180]: https://gitlab.freedesktop.org/drm/intel/issues/180
  [i915#265]: https://gitlab.freedesktop.org/drm/intel/issues/265
  [i915#34]: https://gitlab.freedesktop.org/drm/intel/issues/34
  [i915#49]: https://gitlab.freedesktop.org/drm/intel/issues/49
  [i915#52]: https://gitlab.freedesktop.org/drm/intel/issues/52
  [i915#54]: https://gitlab.freedesktop.org/drm/intel/issues/54
  [i915#588]: https://gitlab.freedesktop.org/drm/intel/issues/588
  [i915#658]: https://gitlab.freedesktop.org/drm/intel/issues/658
  [i915#716]: https://gitlab.freedesktop.org/drm/intel/issues/716
  [i915#79]: https://gitlab.freedesktop.org/drm/intel/issues/79
  [i915#82]: https://gitlab.freedesktop.org/drm/intel/issues/82
  [i915#899]: https://gitlab.freedesktop.org/drm/intel/issues/899
  [i915#93]: https://gitlab.freedesktop.org/drm/intel/issues/93
  [i915#95]: https://gitlab.freedesktop.org/drm/intel/issues/95


Participating hosts (10 -> 10)
------------------------------

  No changes in participating hosts


Build changes
-------------

  * CI: CI-20190529 -> None
  * Linux: CI_DRM_8402 -> Patchwork_17530

  CI-20190529: 20190529
  CI_DRM_8402: b34c04ed51aaaab63716e7491db86c83aab4e095 @ git://anongit.freedesktop.org/gfx-ci/linux
  IGT_5618: 9a94fb4b5ebb82185fb52a1709366458597a62ab @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
  Patchwork_17530: 18e8c538bd2efa06a6622a012dd2eb86d823c2a5 @ git://anongit.freedesktop.org/gfx-ci/linux
  piglit_4509: fdc5a4ca11124ab8413c7988896eec4c97336694 @ git://anongit.freedesktop.org/piglit

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17530/index.html
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [Intel-gfx] [PATCH] drm/i915/pmu: Keep a reference to module while active

[Tvrtko Ursulin]

On 30/04/2020 19:33, Chris Wilson wrote:
> While a perf event is open, keep a reference to the module so we don't
> remove the driver internals mid-sampling.
> 
> Testcase: igt/perf_pmu/module-unload
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> Cc: stable@vger.kernel.org
> ---
>   drivers/gpu/drm/i915/i915_pmu.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
> index 83c6a8ccd2cb..e991a707bdb7 100644
> --- a/drivers/gpu/drm/i915/i915_pmu.c
> +++ b/drivers/gpu/drm/i915/i915_pmu.c
> @@ -442,6 +442,7 @@ static u64 count_interrupts(struct drm_i915_private *i915)
>   static void i915_pmu_event_destroy(struct perf_event *event)
>   {
>   	WARN_ON(event->parent);
> +	module_put(THIS_MODULE);
>   }
>   
>   static int
> @@ -533,8 +534,10 @@ static int i915_pmu_event_init(struct perf_event *event)
>   	if (ret)
>   		return ret;
>   
> -	if (!event->parent)
> +	if (!event->parent) {
> +		__module_get(THIS_MODULE);
>   		event->destroy = i915_pmu_event_destroy;
> +	}
>   
>   	return 0;
>   }
> 

Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Regards,

Tvrtko
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