linux-kernel - Re: fs/io_uring.c:10086:24: warning: Value stored to 'sqe' during its initialization is never read [clang-analyzer-deadcode.DeadStores]

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Message-ID: <4582de8b-962c-1173-88bb-a18b3753876c@kernel.dk>
Date:   Fri, 5 Nov 2021 09:32:47 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     kernel test robot <yujie.liu@...el.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: fs/io_uring.c:10086:24: warning: Value stored to 'sqe' during its
 initialization is never read [clang-analyzer-deadcode.DeadStores]

On 11/5/21 12:42 AM, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   d4439a1189f93d0ac1eaf0197db8e6b3e197d5c7
> commit: f75d118349be055d47407b4ba4ceb98e6437e472 io_uring: harder fdinfo sq/cq ring iterating
> date:   7 days ago
> config: arm-randconfig-c002-20211031 (attached as .config)
> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 82ed106567063ea269c6d5669278b733e173a42f)
> 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
>          # install arm cross compiling tool for clang build
>          # apt-get install binutils-arm-linux-gnueabi
>          # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f75d118349be055d47407b4ba4ceb98e6437e472
>          git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>          git fetch --no-tags linus master
>          git checkout f75d118349be055d47407b4ba4ceb98e6437e472
>          # save the attached .config to linux build tree
>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm clang-analyzer
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> 
> clang-analyzer warnings: (new ones prefixed by >>)
> 
>  >> fs/io_uring.c:10086:24: warning: Value stored to 'sqe' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
>                     struct io_uring_sqe *sqe = &ctx->sq_sqes[sq_idx];
>                                          ^~~   ~~~~~~~~~~~~~~~~~~~~~

Thanks, now fixed:

https://git.kernel.dk/cgit/linux-block/commit/?h=io_uring-5.16&id=a19577808fd33d9e64e015808fbca2769a96721b

-- 
Jens Axboe