linux-kernel - [axboe-block:nvme-passthru-wip 16/19] drivers/nvme/host/ioctl.c:82:25: warning: variable 'ucd' set but not used

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Message-ID: <202110080401.Q0GElaZ1-lkp@intel.com>
Date:   Fri, 8 Oct 2021 04:37:05 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [axboe-block:nvme-passthru-wip 16/19]
 drivers/nvme/host/ioctl.c:82:25: warning: variable 'ucd' set but not used

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git nvme-passthru-wip
head:   9c18980ac90053bcdb21594eae48935d89bf389c
commit: 40669a7355a5518181c2f7c4113d9f8fb808c658 [16/19] nvme: don't store intermediate result/status in command
config: hexagon-randconfig-r045-20211007 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 58b68e70ebf6308f982426a2618782f473218eed)
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://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/commit/?id=40669a7355a5518181c2f7c4113d9f8fb808c658
        git remote add axboe-block https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git
        git fetch --no-tags axboe-block nvme-passthru-wip
        git checkout 40669a7355a5518181c2f7c4113d9f8fb808c658
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=hexagon 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/nvme/host/ioctl.c:82:25: warning: variable 'ucd' set but not used [-Wunused-but-set-variable]
           struct uring_cmd_data *ucd;
                                  ^
   drivers/nvme/host/ioctl.c:155:5: warning: no previous prototype for function 'nvme_rq_map_user_fixedb' [-Wmissing-prototypes]
   int nvme_rq_map_user_fixedb(struct request_queue *q, struct request *rq,
       ^
   drivers/nvme/host/ioctl.c:155:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int nvme_rq_map_user_fixedb(struct request_queue *q, struct request *rq,
   ^
   static 
   drivers/nvme/host/ioctl.c:244:3: error: implicit declaration of function '__blk_execute_rq_nowait' [-Werror,-Wimplicit-function-declaration]
                   __blk_execute_rq_nowait(ns ? ns->disk : NULL, req, false, false,
                   ^
   drivers/nvme/host/ioctl.c:244:3: note: did you mean 'blk_execute_rq_nowait'?
   include/linux/blkdev.h:894:13: note: 'blk_execute_rq_nowait' declared here
   extern void blk_execute_rq_nowait(struct gendisk *,
               ^
   2 warnings and 1 error generated.


vim +/ucd +82 drivers/nvme/host/ioctl.c

5cc445dd8df6e06f Kanchan Joshi 2021-08-05  78  
5cc445dd8df6e06f Kanchan Joshi 2021-08-05  79  static void nvme_end_async_pt(struct request *req, blk_status_t err)
5cc445dd8df6e06f Kanchan Joshi 2021-08-05  80  {
5cc445dd8df6e06f Kanchan Joshi 2021-08-05  81  	struct io_uring_cmd *ioucmd;
5cc445dd8df6e06f Kanchan Joshi 2021-08-05 @82  	struct uring_cmd_data *ucd;
5cc445dd8df6e06f Kanchan Joshi 2021-08-05  83  
5cc445dd8df6e06f Kanchan Joshi 2021-08-05  84  	ioucmd = req->end_io_data;
5cc445dd8df6e06f Kanchan Joshi 2021-08-05  85  	ucd = (struct uring_cmd_data *) nvme_ioucmd_data_addr(ioucmd);
5cc445dd8df6e06f Kanchan Joshi 2021-08-05  86  
5cc445dd8df6e06f Kanchan Joshi 2021-08-05  87  	/* this takes care of setting up task-work */
5cc445dd8df6e06f Kanchan Joshi 2021-08-05  88  	io_uring_cmd_complete_in_task(ioucmd, nvme_pt_task_cb);
5cc445dd8df6e06f Kanchan Joshi 2021-08-05  89  }
5cc445dd8df6e06f Kanchan Joshi 2021-08-05  90  

:::::: The code at line 82 was first introduced by commit
:::::: 5cc445dd8df6e06f3482711aa590170450364393 nvme: wire-up support for async-passthru on char-device.

:::::: TO: Kanchan Joshi <joshi.k@...sung.com>
:::::: CC: Jens Axboe <axboe@...nel.dk>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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