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From: kernel test robot <[email protected]>
To: Kanchan Joshi <[email protected]>, [email protected], [email protected]
Cc: [email protected], [email protected],
	[email protected], [email protected],
	[email protected], [email protected],
	[email protected], [email protected],
	Kanchan Joshi <[email protected]>,
	Anuj Gupta <[email protected]>
Subject: Re: [PATCH 4/4] nvme: wire up async polling for io passthrough commands
Date: Sat, 6 Aug 2022 08:06:02 +0800	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

Hi Kanchan,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on axboe-block/for-next]
[also build test WARNING on linus/master next-20220805]
[cannot apply to hch-configfs/for-next v5.19]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Kanchan-Joshi/fs-add-file_operations-uring_cmd_iopoll/20220806-004320
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
config: i386-randconfig-a002 (https://download.01.org/0day-ci/archive/20220806/[email protected]/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 26dd42705c2af0b8f6e5d6cdb32c9bd5ed9524eb)
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/0964795577fbf09d8b315269504b5e87b5ac492b
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Kanchan-Joshi/fs-add-file_operations-uring_cmd_iopoll/20220806-004320
        git checkout 0964795577fbf09d8b315269504b5e87b5ac492b
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/nvme/host/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <[email protected]>

All warnings (new ones prefixed by >>):

>> drivers/nvme/host/ioctl.c:638:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
           if (test_bit(QUEUE_FLAG_POLL, &q->queue_flags) && bio && bio->bi_bdev)
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/nvme/host/ioctl.c:641:9: note: uninitialized use occurs here
           return ret;
                  ^~~
   drivers/nvme/host/ioctl.c:638:2: note: remove the 'if' if its condition is always true
           if (test_bit(QUEUE_FLAG_POLL, &q->queue_flags) && bio && bio->bi_bdev)
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/nvme/host/ioctl.c:638:6: warning: variable 'ret' is used uninitialized whenever '&&' condition is false [-Wsometimes-uninitialized]
           if (test_bit(QUEUE_FLAG_POLL, &q->queue_flags) && bio && bio->bi_bdev)
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/nvme/host/ioctl.c:641:9: note: uninitialized use occurs here
           return ret;
                  ^~~
   drivers/nvme/host/ioctl.c:638:6: note: remove the '&&' if its condition is always true
           if (test_bit(QUEUE_FLAG_POLL, &q->queue_flags) && bio && bio->bi_bdev)
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/nvme/host/ioctl.c:638:6: warning: variable 'ret' is used uninitialized whenever '&&' condition is false [-Wsometimes-uninitialized]
           if (test_bit(QUEUE_FLAG_POLL, &q->queue_flags) && bio && bio->bi_bdev)
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/nvme/host/ioctl.c:641:9: note: uninitialized use occurs here
           return ret;
                  ^~~
   drivers/nvme/host/ioctl.c:638:6: note: remove the '&&' if its condition is always true
           if (test_bit(QUEUE_FLAG_POLL, &q->queue_flags) && bio && bio->bi_bdev)
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/nvme/host/ioctl.c:629:9: note: initialize the variable 'ret' to silence this warning
           int ret;
                  ^
                   = 0
   3 warnings generated.


vim +638 drivers/nvme/host/ioctl.c

   625	
   626	int nvme_ns_chr_uring_cmd_iopoll(struct io_uring_cmd *ioucmd)
   627	{
   628		struct bio *bio;
   629		int ret;
   630		struct nvme_ns *ns;
   631		struct request_queue *q;
   632	
   633		rcu_read_lock();
   634		bio = READ_ONCE(ioucmd->cookie);
   635		ns = container_of(file_inode(ioucmd->file)->i_cdev,
   636				struct nvme_ns, cdev);
   637		q = ns->queue;
 > 638		if (test_bit(QUEUE_FLAG_POLL, &q->queue_flags) && bio && bio->bi_bdev)
   639			ret = bio_poll(bio, 0, 0);
   640		rcu_read_unlock();
   641		return ret;
   642	}
   643	#ifdef CONFIG_NVME_MULTIPATH
   644	static int nvme_ns_head_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd,
   645			void __user *argp, struct nvme_ns_head *head, int srcu_idx)
   646		__releases(&head->srcu)
   647	{
   648		struct nvme_ctrl *ctrl = ns->ctrl;
   649		int ret;
   650	
   651		nvme_get_ctrl(ns->ctrl);
   652		srcu_read_unlock(&head->srcu, srcu_idx);
   653		ret = nvme_ctrl_ioctl(ns->ctrl, cmd, argp);
   654	
   655		nvme_put_ctrl(ctrl);
   656		return ret;
   657	}
   658	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

  parent reply	other threads:[~2022-08-06  0:06 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20220805155300epcas5p1b98722e20990d0095238964e2be9db34@epcas5p1.samsung.com>
2022-08-05 15:42 ` [PATCH 0/4] iopoll support for io_uring/nvme passthrough Kanchan Joshi
     [not found]   ` <CGME20220805155304epcas5p1bb687a8f9b25317af39def01696626e8@epcas5p1.samsung.com>
2022-08-05 15:42     ` [PATCH 1/4] fs: add file_operations->uring_cmd_iopoll Kanchan Joshi
     [not found]   ` <CGME20220805155307epcas5p4bab3f05dc13d8fc2f03c7a26e9bd8c7c@epcas5p4.samsung.com>
2022-08-05 15:42     ` [PATCH 2/4] io_uring: add iopoll infrastructure for io_uring_cmd Kanchan Joshi
     [not found]   ` <CGME20220805155310epcas5p2bd7ec5b9bee73893958f4bc84038eca0@epcas5p2.samsung.com>
2022-08-05 15:42     ` [PATCH 3/4] block: export blk_rq_is_poll Kanchan Joshi
     [not found]   ` <CGME20220805155313epcas5p2d35d22831bd07ef33fbdc28bd99ae1d0@epcas5p2.samsung.com>
2022-08-05 15:42     ` [PATCH 4/4] nvme: wire up async polling for io passthrough commands Kanchan Joshi
2022-08-05 17:03       ` Jens Axboe
2022-08-05 17:07         ` Kanchan Joshi
2022-08-05 21:22       ` kernel test robot
2022-08-06  0:06       ` kernel test robot [this message]
2022-08-06  1:38       ` kernel test robot
2022-08-07 12:25       ` kernel test robot
2022-08-05 17:04   ` [PATCH 0/4] iopoll support for io_uring/nvme passthrough Jens Axboe
2022-08-05 17:13     ` Kanchan Joshi
2022-08-05 17:27       ` Jens Axboe
2022-08-05 17:18     ` Jens Axboe
2022-08-05 18:11       ` Keith Busch
2022-08-05 18:15         ` Jens Axboe
2022-08-07 17:58           ` Kanchan Joshi
2022-08-07 18:46             ` Jens Axboe
2022-08-05 18:21       ` Jens Axboe

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