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Subject: Re: [PATCH] drm/i915/gt: remove redundant assignment to variable x
To:     Dan Carpenter <dan.carpenter@oracle.com>, kbuild@lists.01.org
Cc:     lkp@intel.com, kbuild-all@lists.01.org,
        Jani Nikula <jani.nikula@linux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@intel.com>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Chris Wilson <chris@chris-wilson.co.uk>,
        intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
        kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20200414092359.GC1163@kadam>
From:   Colin Ian King <colin.king@canonical.com>
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Message-ID: <43eb0cbb-9bf0-c99a-470d-8121c3108a5e@canonical.com>
Date:   Tue, 14 Apr 2020 11:07:18 +0100
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In-Reply-To: <20200414092359.GC1163@kadam>
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Sender: linux-kernel-owner@vger.kernel.org
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Hi Dan,

I'd post a revert, but I don't seem to see an upstream commit for this
this to revert against. What's the revert policy in these cases? Or can
the patch be just ignored by the maintainers so it's not applied?

Colin


On 14/04/2020 10:23, Dan Carpenter wrote:
> Hi Colin,
> 
> url:    https://github.com/0day-ci/linux/commits/Colin-King/drm-i915-gt-remove-redundant-assignment-to-variable-x/20200411-032731
> base:   git://anongit.freedesktop.org/drm-intel for-linux-next
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kbuild test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> 
> smatch warnings:
> drivers/gpu/drm/i915/gt/intel_engine_cs.c:1210 print_request() error: uninitialized symbol 'x'.
> 
> # https://github.com/0day-ci/linux/commit/6ee08d455bba0066e8f5f276dcd43d9e3e594dc5
> git remote add linux-review https://github.com/0day-ci/linux
> git remote update linux-review
> git checkout 6ee08d455bba0066e8f5f276dcd43d9e3e594dc5
> vim +/x +1210 drivers/gpu/drm/i915/gt/intel_engine_cs.c
> 
> f636edb214a5ff drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2017-10-09  1202  static void print_request(struct drm_printer *m,
> e61e0f51ba7974 drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2018-02-21  1203  			  struct i915_request *rq,
> f636edb214a5ff drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2017-10-09  1204  			  const char *prefix)
> f636edb214a5ff drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2017-10-09  1205  {
> ab2681512b4c10 drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2018-03-14  1206  	const char *name = rq->fence.ops->get_timeline_name(&rq->fence);
> 96d4f03c20d04c drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2018-05-17  1207  	char buf[80] = "";
> 6ee08d455bba00 drivers/gpu/drm/i915/gt/intel_engine_cs.c Colin Ian King 2020-04-10  1208  	int x;
>                                                                                                 ^^^^^
> 
> 247870ac8ea729 drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2018-04-24  1209  
> 247870ac8ea729 drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2018-04-24 @1210  	x = print_sched_attr(rq->i915, &rq->sched.attr, buf, x, sizeof(buf));
>                                                                                                                                                      ^
> Uninitialized variable
> 
> ab2681512b4c10 drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2018-03-14  1211  
> b300fde8965fdd drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2019-02-26  1212  	drm_printf(m, "%s %llx:%llx%s%s %s @ %dms: %s\n",
> b7268c5eed0ab4 drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2018-04-18  1213  		   prefix,
> b300fde8965fdd drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2019-02-26  1214  		   rq->fence.context, rq->fence.seqno,
> 8547444137ec61 drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2019-01-29  1215  		   i915_request_completed(rq) ? "!" :
> 8547444137ec61 drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2019-01-29  1216  		   i915_request_started(rq) ? "*" :
> 8547444137ec61 drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2019-01-29  1217  		   "",
> 8c334f24e3b448 drivers/gpu/drm/i915/gt/intel_engine_cs.c Chris Wilson   2019-05-01  1218  		   test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
> 8c334f24e3b448 drivers/gpu/drm/i915/gt/intel_engine_cs.c Chris Wilson   2019-05-01  1219  			    &rq->fence.flags) ? "+" :
> 52c0fdb25c7c91 drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2019-01-29  1220  		   test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT,
> 8c334f24e3b448 drivers/gpu/drm/i915/gt/intel_engine_cs.c Chris Wilson   2019-05-01  1221  			    &rq->fence.flags) ? "-" :
> 8c334f24e3b448 drivers/gpu/drm/i915/gt/intel_engine_cs.c Chris Wilson   2019-05-01  1222  		   "",
> 247870ac8ea729 drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2018-04-24  1223  		   buf,
> f636edb214a5ff drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2017-10-09  1224  		   jiffies_to_msecs(jiffies - rq->emitted_jiffies),
> ab2681512b4c10 drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2018-03-14  1225  		   name);
> f636edb214a5ff drivers/gpu/drm/i915/intel_engine_cs.c    Chris Wilson   2017-10-09  1226  }
> 
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
>