linux-kernel - Re: [PATCH] scsi/ata: Use unsigned int for cmd's type in ioctls in scsi_host

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Date:   Sat, 20 Oct 2018 12:52:53 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     kbuild-all@...org, Jens Axboe <axboe@...nel.dk>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Adaptec OEM Raid Solutions <aacraid@...rosemi.com>,
        "Manoj N. Kumar" <manoj@...ux.vnet.ibm.com>,
        "Matthew R. Ochs" <mrochs@...ux.vnet.ibm.com>,
        Uma Krishnan <ukrishn@...ux.vnet.ibm.com>,
        Bradley Grove <linuxdrivers@...otech.com>,
        Don Brace <don.brace@...rosemi.com>,
        Brian King <brking@...ibm.com>,
        Bart Van Assche <bvanassche@....org>,
        linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org, esc.storagedev@...rosemi.com,
        Nathan Chancellor <natechancellor@...il.com>
Subject: Re: [PATCH] scsi/ata: Use unsigned int for cmd's type in ioctls in
 scsi_host_template

Hi Nathan,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on scsi/for-next]
[also build test ERROR on v4.19-rc8 next-20181019]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Nathan-Chancellor/scsi-ata-Use-unsigned-int-for-cmd-s-type-in-ioctls-in-scsi_host_template/20181020-120416
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi.git for-next
config: powerpc-allmodconfig (attached as .config)
compiler: powerpc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
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=7.2.0 make.cross ARCH=powerpc 

All errors (new ones prefixed by >>):

>> drivers/scsi//cxlflash/main.c:3170:11: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]
     .ioctl = cxlflash_ioctl,
              ^~~~~~~~~~~~~~
   drivers/scsi//cxlflash/main.c:3170:11: note: (near initialization for 'driver_template.ioctl')
   cc1: some warnings being treated as errors
--
>> drivers/scsi//cxlflash/superpipe.c:2099:5: error: conflicting types for 'cxlflash_ioctl'
    int cxlflash_ioctl(struct scsi_device *sdev, unsigned int cmd, void __user *arg)
        ^~~~~~~~~~~~~~
   In file included from drivers/scsi//cxlflash/superpipe.c:29:0:
   drivers/scsi//cxlflash/common.h:337:5: note: previous declaration of 'cxlflash_ioctl' was here
    int cxlflash_ioctl(struct scsi_device *sdev, int cmd, void __user *arg);
        ^~~~~~~~~~~~~~

vim +/cxlflash_ioctl +2099 drivers/scsi//cxlflash/superpipe.c

  2082	
  2083	/**
  2084	 * cxlflash_ioctl() - IOCTL handler for driver
  2085	 * @sdev:	SCSI device associated with LUN.
  2086	 * @cmd:	IOCTL command.
  2087	 * @arg:	Userspace ioctl data structure.
  2088	 *
  2089	 * A read/write semaphore is used to implement a 'drain' of currently
  2090	 * running ioctls. The read semaphore is taken at the beginning of each
  2091	 * ioctl thread and released upon concluding execution. Additionally the
  2092	 * semaphore should be released and then reacquired in any ioctl execution
  2093	 * path which will wait for an event to occur that is outside the scope of
  2094	 * the ioctl (i.e. an adapter reset). To drain the ioctls currently running,
  2095	 * a thread simply needs to acquire the write semaphore.
  2096	 *
  2097	 * Return: 0 on success, -errno on failure
  2098	 */
> 2099	int cxlflash_ioctl(struct scsi_device *sdev, unsigned int cmd, void __user *arg)

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