linux-kernel - Re: [kbuild-all] Re: [PATCH v2 9/9] drm/bridge: ti-sn65dsi86: Avoid invalid rates

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Message-ID: <997d40ad-2a86-7a21-b16c-f33f4e2ebca8@intel.com>
Date:   Tue, 7 Jan 2020 08:55:08 +0800
From:   Rong Chen <rong.a.chen@...el.com>
To:     Doug Anderson <dianders@...omium.org>,
        kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Rob Clark <robdclark@...omium.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Jeffrey Hugo <jeffrey.l.hugo@...il.com>,
        David Airlie <airlied@...ux.ie>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Jonas Karlman <jonas@...boo.se>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Sean Paul <seanpaul@...omium.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [kbuild-all] Re: [PATCH v2 9/9] drm/bridge: ti-sn65dsi86: Avoid
 invalid rates



On 1/7/20 6:43 AM, Doug Anderson wrote:
> Dear Robot,
>
> On Sat, Dec 21, 2019 at 5:57 AM kbuild test robot <lkp@...el.com> wrote:
>> Hi Douglas,
>>
>> I love your patch! Perhaps something to improve:
>>
>> [auto build test WARNING on linus/master]
>> [also build test WARNING on v5.5-rc2 next-20191220]
>> [if your patch is applied to the wrong git tree, please drop us a note to help
>> improve the system. BTW, we also suggest to use '--base' option to specify the
>> base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
>>
>> url:    https://github.com/0day-ci/linux/commits/Douglas-Anderson/drm-bridge-ti-sn65dsi86-Improve-support-for-AUO-B116XAK01-other-DP/20191221-083448
>> base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 7e0165b2f1a912a06e381e91f0f4e495f4ac3736
>> config: sh-allmodconfig (attached as .config)
>> compiler: sh4-linux-gcc (GCC) 7.5.0
>> reproduce:
>>          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>          chmod +x ~/bin/make.cross
>>          # save the attached .config to linux build tree
>>          GCC_VERSION=7.5.0 make.cross ARCH=sh
>>
>> If you fix the issue, kindly add following tag
>> Reported-by: kbuild test robot <lkp@...el.com>
>>
>> Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
>> http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings
>>
>> All warnings (new ones prefixed by >>):
>>
>>     drivers/gpu/drm/bridge/ti-sn65dsi86.c: In function 'ti_sn_bridge_enable':
>>>> drivers/gpu/drm/bridge/ti-sn65dsi86.c:543:18: warning: 'rate_valid' may be used uninitialized in this function [-Wmaybe-uninitialized]
>>         if (rate_valid[i])
>>             ~~~~~~~~~~^~~
> I love your report!  Interestingly I had already noticed this problem
> myself and v3 of the patch fixes the issue.  See:
>
> https://lore.kernel.org/r/20191218143416.v3.9.Ib59207b66db377380d13748752d6fce5596462c5@changeid
>
>
> If the maintainer of the robot is reading this, something to improve
> about your robot is that it could have noticed v3 of the patch (which
> was posted several days before your report) and skipped analyzing v2
> of the patch.  I'm currently using Change-Ids embedded in my
> Message-Id to help automation relate one version of my patches to the
> next.  Specifically you compare the Message-Id of v2 and v3 of this
> patch:
>
> 20191217164702.v2.9.Ib59207b66db377380d13748752d6fce5596462c5@...ngeid
> 20191218143416.v3.9.Ib59207b66db377380d13748752d6fce5596462c5@...ngeid
>
> Since the last section before the "@changeid" remained constant it
> could be assumed that this patch replaced the v2.  I know there's not
> too much usage of this technique yet, but if only more tools supported
> it then maybe more people would use it.

Hi Doug,

Thanks for your suggestion, the root cause is that the v3 wasn't handled 
before this report.
We'll definitely give serious thought to your suggestion.

   v2: 
Douglas-Anderson/drm-bridge-ti-sn65dsi86-Improve-support-for-AUO-B116XAK01-other-DP/20191221-083448
   v3: 
Douglas-Anderson/drm-bridge-ti-sn65dsi86-Improve-support-for-AUO-B116XAK01-other-DP/20191222-062646

Best Regards,
Rong Chen

>
>
> -Doug
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