linux-kernel - Re: [PATCH -next v2 2/2] blk-throttle: fix io hung due to configuration updates

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Message-ID: <84fe296e-6e56-3ca9-73a8-357beb675c6e@huawei.com>
Date:   Thu, 19 May 2022 10:11:06 +0800
From:   "yukuai (C)" <yukuai3@...wei.com>
To:     kernel test robot <lkp@...el.com>, <tj@...nel.org>,
        <axboe@...nel.dk>, <ming.lei@...hat.com>
CC:     <kbuild-all@...ts.01.org>, <cgroups@...r.kernel.org>,
        <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <yi.zhang@...wei.com>
Subject: Re: [PATCH -next v2 2/2] blk-throttle: fix io hung due to
 configuration updates



在 2022/05/18 23:52, kernel test robot 写道:
> Hi Yu,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on next-20220517]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Yu-Kuai/bugfix-for-blk-throttle/20220518-151713
> base:    47c1c54d1bcd0a69a56b49473bc20f17b70e5242
> config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20220518/202205182347.tMOOqyfL-lkp@intel.com/config)
> compiler: m68k-linux-gcc (GCC) 11.3.0
> reproduce (this is a W=1 build):
>          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>          chmod +x ~/bin/make.cross
>          # https://github.com/intel-lab-lkp/linux/commit/f8345dbaf4ed491742aab29834aff66b4930c087
>          git remote add linux-review https://github.com/intel-lab-lkp/linux
>          git fetch --no-tags linux-review Yu-Kuai/bugfix-for-blk-throttle/20220518-151713
>          git checkout f8345dbaf4ed491742aab29834aff66b4930c087
>          # save the config file
>          mkdir build_dir && cp config build_dir/.config
>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>):
> 
>     m68k-linux-ld: block/blk-throttle.o: in function `tg_conf_updated':
>>> blk-throttle.c:(.text+0x25bc): undefined reference to `__udivdi3'
>>> m68k-linux-ld: blk-throttle.c:(.text+0x2626): undefined reference to `__udivdi3'
Hi,

I'm confused here, the only place that I can relate to this:

	return dispatched * new_limit / old_limit;

However, I don't understand yet why this is problematic...
>     `.exit.text' referenced in section `.data' of sound/soc/codecs/tlv320adc3xxx.o: defined in discarded section `.exit.text' of sound/soc/codecs/tlv320adc3xxx.o
>