Re: [PATCH 15/24] compat_ioctl: scsi: move ioctl handling into drivers

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Dec 11, 2019 at 09:42:49PM +0100, Arnd Bergmann wrote:
> Each driver calling scsi_ioctl() gets an equivalent compat_ioctl()
> handler that implements the same commands by calling scsi_compat_ioctl().
> 
> The scsi_cmd_ioctl() and scsi_cmd_blk_ioctl() functions are compatible
> at this point, so any driver that calls those can do so for both native
> and compat mode, with the argument passed through compat_ptr().
> 
> With this, we can remove the entries from fs/compat_ioctl.c.  The new
> code is larger, but should be easier to maintain and keep updated with
> newly added commands.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/block/virtio_blk.c |   3 +
>  drivers/scsi/ch.c          |   9 ++-
>  drivers/scsi/sd.c          |  50 ++++++--------
>  drivers/scsi/sg.c          |  44 ++++++++-----
>  drivers/scsi/sr.c          |  57 ++++++++++++++--
>  drivers/scsi/st.c          |  51 ++++++++------
>  fs/compat_ioctl.c          | 132 +------------------------------------
>  7 files changed, 142 insertions(+), 204 deletions(-)
> 
> diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
> index 7ffd719d89de..fbbf18ac1d5d 100644
> --- a/drivers/block/virtio_blk.c
> +++ b/drivers/block/virtio_blk.c
> @@ -405,6 +405,9 @@ static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
>  
>  static const struct block_device_operations virtblk_fops = {
>  	.ioctl  = virtblk_ioctl,
> +#ifdef CONFIG_COMPAT
> +	.compat_ioctl = blkdev_compat_ptr_ioctl,
> +#endif
>  	.owner  = THIS_MODULE,
>  	.getgeo = virtblk_getgeo,
>  };


virtio part:

Acked-by: Michael S. Tsirkin <mst@redhat.com>

> diff --git a/drivers/scsi/ch.c b/drivers/scsi/ch.c
> index 76751d6c7f0d..ed5f4a6ae270 100644
> --- a/drivers/scsi/ch.c
> +++ b/drivers/scsi/ch.c
> @@ -872,6 +872,10 @@ static long ch_ioctl_compat(struct file * file,
>  			    unsigned int cmd, unsigned long arg)
>  {
>  	scsi_changer *ch = file->private_data;
> +	int retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
> +							file->f_flags & O_NDELAY);
> +	if (retval)
> +		return retval;
>  
>  	switch (cmd) {
>  	case CHIOGPARAMS:
> @@ -883,7 +887,7 @@ static long ch_ioctl_compat(struct file * file,
>  	case CHIOINITELEM:
>  	case CHIOSVOLTAG:
>  		/* compatible */
> -		return ch_ioctl(file, cmd, arg);
> +		return ch_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
>  	case CHIOGSTATUS32:
>  	{
>  		struct changer_element_status32 ces32;
> @@ -898,8 +902,7 @@ static long ch_ioctl_compat(struct file * file,
>  		return ch_gstatus(ch, ces32.ces_type, data);
>  	}
>  	default:
> -		// return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
> -		return -ENOIOCTLCMD;
> +		return scsi_compat_ioctl(ch->device, cmd, compat_ptr(arg));
>  
>  	}
>  }
> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> index cea625906440..5afb0046b12a 100644
> --- a/drivers/scsi/sd.c
> +++ b/drivers/scsi/sd.c
> @@ -1465,13 +1465,12 @@ static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
>   *	Note: most ioctls are forward onto the block subsystem or further
>   *	down in the scsi subsystem.
>   **/
> -static int sd_ioctl(struct block_device *bdev, fmode_t mode,
> -		    unsigned int cmd, unsigned long arg)
> +static int sd_ioctl_common(struct block_device *bdev, fmode_t mode,
> +			   unsigned int cmd, void __user *p)
>  {
>  	struct gendisk *disk = bdev->bd_disk;
>  	struct scsi_disk *sdkp = scsi_disk(disk);
>  	struct scsi_device *sdp = sdkp->device;
> -	void __user *p = (void __user *)arg;
>  	int error;
>      
>  	SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
> @@ -1507,9 +1506,6 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode,
>  			break;
>  		default:
>  			error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
> -			if (error != -ENOTTY)
> -				break;
> -			error = scsi_ioctl(sdp, cmd, p);
>  			break;
>  	}
>  out:
> @@ -1691,39 +1687,31 @@ static void sd_rescan(struct device *dev)
>  	revalidate_disk(sdkp->disk);
>  }
>  
> +static int sd_ioctl(struct block_device *bdev, fmode_t mode,
> +		    unsigned int cmd, unsigned long arg)
> +{
> +	void __user *p = (void __user *)arg;
> +	int ret;
> +
> +	ret = sd_ioctl_common(bdev, mode, cmd, p);
> +	if (ret != -ENOTTY)
> +		return ret;
> +
> +	return scsi_ioctl(scsi_disk(bdev->bd_disk)->device, cmd, p);
> +}
>  
>  #ifdef CONFIG_COMPAT
> -/* 
> - * This gets directly called from VFS. When the ioctl 
> - * is not recognized we go back to the other translation paths. 
> - */
>  static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
>  			   unsigned int cmd, unsigned long arg)
>  {
> -	struct gendisk *disk = bdev->bd_disk;
> -	struct scsi_disk *sdkp = scsi_disk(disk);
> -	struct scsi_device *sdev = sdkp->device;
>  	void __user *p = compat_ptr(arg);
> -	int error;
> -
> -	error = scsi_verify_blk_ioctl(bdev, cmd);
> -	if (error < 0)
> -		return error;
> +	int ret;
>  
> -	error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
> -			(mode & FMODE_NDELAY) != 0);
> -	if (error)
> -		return error;
> +	ret = sd_ioctl_common(bdev, mode, cmd, p);
> +	if (ret != -ENOTTY)
> +		return ret;
>  
> -	if (is_sed_ioctl(cmd))
> -		return sed_ioctl(sdkp->opal_dev, cmd, p);
> -	       
> -	/* 
> -	 * Let the static ioctl translation table take care of it.
> -	 */
> -	if (!sdev->host->hostt->compat_ioctl)
> -		return -ENOIOCTLCMD; 
> -	return sdev->host->hostt->compat_ioctl(sdev, cmd, p);
> +	return scsi_compat_ioctl(scsi_disk(bdev->bd_disk)->device, cmd, p);
>  }
>  #endif
>  
> diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
> index 985546aac236..08efcee7a34d 100644
> --- a/drivers/scsi/sg.c
> +++ b/drivers/scsi/sg.c
> @@ -910,19 +910,14 @@ static int put_compat_request_table(struct compat_sg_req_info __user *o,
>  #endif
>  
>  static long
> -sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
> +sg_ioctl_common(struct file *filp, Sg_device *sdp, Sg_fd *sfp,
> +		unsigned int cmd_in, void __user *p)
>  {
> -	void __user *p = (void __user *)arg;
>  	int __user *ip = p;
>  	int result, val, read_only;
> -	Sg_device *sdp;
> -	Sg_fd *sfp;
>  	Sg_request *srp;
>  	unsigned long iflags;
>  
> -	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
> -		return -ENXIO;
> -
>  	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
>  				   "sg_ioctl: cmd=0x%x\n", (int) cmd_in));
>  	read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
> @@ -1145,29 +1140,44 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
>  			cmd_in, filp->f_flags & O_NDELAY);
>  	if (result)
>  		return result;
> +
> +	return -ENOIOCTLCMD;
> +}
> +
> +static long
> +sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
> +{
> +	void __user *p = (void __user *)arg;
> +	Sg_device *sdp;
> +	Sg_fd *sfp;
> +	int ret;
> +
> +	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
> +		return -ENXIO;
> +
> +	ret = sg_ioctl_common(filp, sdp, sfp, cmd_in, p);
> +	if (ret != -ENOIOCTLCMD)
> +		return ret;
> +
>  	return scsi_ioctl(sdp->device, cmd_in, p);
>  }
>  
>  #ifdef CONFIG_COMPAT
>  static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
>  {
> +	void __user *p = compat_ptr(arg);
>  	Sg_device *sdp;
>  	Sg_fd *sfp;
> -	struct scsi_device *sdev;
> +	int ret;
>  
>  	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
>  		return -ENXIO;
>  
> -	sdev = sdp->device;
> -	if (sdev->host->hostt->compat_ioctl) { 
> -		int ret;
> -
> -		ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
> -
> +	ret = sg_ioctl_common(filp, sdp, sfp, cmd_in, p);
> +	if (ret != -ENOIOCTLCMD)
>  		return ret;
> -	}
> -	
> -	return -ENOIOCTLCMD;
> +
> +	return scsi_compat_ioctl(sdp->device, cmd_in, p);
>  }
>  #endif
>  
> diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
> index 4664fdf75c0f..6033a886c42c 100644
> --- a/drivers/scsi/sr.c
> +++ b/drivers/scsi/sr.c
> @@ -38,6 +38,7 @@
>  #include <linux/kernel.h>
>  #include <linux/mm.h>
>  #include <linux/bio.h>
> +#include <linux/compat.h>
>  #include <linux/string.h>
>  #include <linux/errno.h>
>  #include <linux/cdrom.h>
> @@ -598,6 +599,55 @@ static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
>  	return ret;
>  }
>  
> +#ifdef CONFIG_COMPAT
> +static int sr_block_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
> +			  unsigned long arg)
> +{
> +	struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
> +	struct scsi_device *sdev = cd->device;
> +	void __user *argp = compat_ptr(arg);
> +	int ret;
> +
> +	mutex_lock(&sr_mutex);
> +
> +	ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
> +			(mode & FMODE_NDELAY) != 0);
> +	if (ret)
> +		goto out;
> +
> +	scsi_autopm_get_device(sdev);
> +
> +	/*
> +	 * Send SCSI addressing ioctls directly to mid level, send other
> +	 * ioctls to cdrom/block level.
> +	 */
> +	switch (cmd) {
> +	case SCSI_IOCTL_GET_IDLUN:
> +	case SCSI_IOCTL_GET_BUS_NUMBER:
> +		ret = scsi_compat_ioctl(sdev, cmd, argp);
> +		goto put;
> +	}
> +
> +	/*
> +	 * CDROM ioctls are handled in the block layer, but
> +	 * do the scsi blk ioctls here.
> +	 */
> +	ret = scsi_cmd_blk_ioctl(bdev, mode, cmd, argp);
> +	if (ret != -ENOTTY)
> +		return ret;
> +
> +	ret = scsi_compat_ioctl(sdev, cmd, argp);
> +
> +put:
> +	scsi_autopm_put_device(sdev);
> +
> +out:
> +	mutex_unlock(&sr_mutex);
> +	return ret;
> +
> +}
> +#endif
> +
>  static unsigned int sr_block_check_events(struct gendisk *disk,
>  					  unsigned int clearing)
>  {
> @@ -641,12 +691,11 @@ static const struct block_device_operations sr_bdops =
>  	.open		= sr_block_open,
>  	.release	= sr_block_release,
>  	.ioctl		= sr_block_ioctl,
> +#ifdef CONFIG_COMPAT
> +	.ioctl		= sr_block_compat_ioctl,
> +#endif
>  	.check_events	= sr_block_check_events,
>  	.revalidate_disk = sr_block_revalidate_disk,
> -	/* 
> -	 * No compat_ioctl for now because sr_block_ioctl never
> -	 * seems to pass arbitrary ioctls down to host drivers.
> -	 */
>  };
>  
>  static int sr_open(struct cdrom_device_info *cdi, int purpose)
> diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
> index 9e3fff2de83e..393f3019ccac 100644
> --- a/drivers/scsi/st.c
> +++ b/drivers/scsi/st.c
> @@ -3501,7 +3501,7 @@ static int partition_tape(struct scsi_tape *STp, int size)
>  
>  
>  /* The ioctl command */
> -static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
> +static long st_ioctl_common(struct file *file, unsigned int cmd_in, void __user *p)
>  {
>  	int i, cmd_nr, cmd_type, bt;
>  	int retval = 0;
> @@ -3509,7 +3509,6 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
>  	struct scsi_tape *STp = file->private_data;
>  	struct st_modedef *STm;
>  	struct st_partstat *STps;
> -	void __user *p = (void __user *)arg;
>  
>  	if (mutex_lock_interruptible(&STp->lock))
>  		return -ERESTARTSYS;
> @@ -3824,9 +3823,19 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
>  	}
>  	mutex_unlock(&STp->lock);
>  	switch (cmd_in) {
> +		case SCSI_IOCTL_STOP_UNIT:
> +			/* unload */
> +			retval = scsi_ioctl(STp->device, cmd_in, p);
> +			if (!retval) {
> +				STp->rew_at_close = 0;
> +				STp->ready = ST_NO_TAPE;
> +			}
> +			return retval;
> +
>  		case SCSI_IOCTL_GET_IDLUN:
>  		case SCSI_IOCTL_GET_BUS_NUMBER:
>  			break;
> +
>  		default:
>  			if ((cmd_in == SG_IO ||
>  			     cmd_in == SCSI_IOCTL_SEND_COMMAND ||
> @@ -3840,42 +3849,46 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
>  				return i;
>  			break;
>  	}
> -	retval = scsi_ioctl(STp->device, cmd_in, p);
> -	if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
> -		STp->rew_at_close = 0;
> -		STp->ready = ST_NO_TAPE;
> -	}
> -	return retval;
> +	return -ENOTTY;
>  
>   out:
>  	mutex_unlock(&STp->lock);
>  	return retval;
>  }
>  
> +static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
> +{
> +	void __user *p = (void __user *)arg;
> +	struct scsi_tape *STp = file->private_data;
> +	int ret;
> +
> +	ret = st_ioctl_common(file, cmd_in, p);
> +	if (ret != -ENOTTY)
> +		return ret;
> +
> +	return scsi_ioctl(STp->device, cmd_in, p);
> +}
> +
>  #ifdef CONFIG_COMPAT
>  static long st_compat_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
>  {
>  	void __user *p = compat_ptr(arg);
>  	struct scsi_tape *STp = file->private_data;
> -	struct scsi_device *sdev = STp->device;
> -	int ret = -ENOIOCTLCMD;
> +	int ret;
>  
>  	/* argument conversion is handled using put_user_mtpos/put_user_mtget */
>  	switch (cmd_in) {
> -	case MTIOCTOP:
> -		return st_ioctl(file, MTIOCTOP, (unsigned long)p);
>  	case MTIOCPOS32:
> -		return st_ioctl(file, MTIOCPOS, (unsigned long)p);
> +		return st_ioctl_common(file, MTIOCPOS, p);
>  	case MTIOCGET32:
> -		return st_ioctl(file, MTIOCGET, (unsigned long)p);
> +		return st_ioctl_common(file, MTIOCGET, p);
>  	}
>  
> -	if (sdev->host->hostt->compat_ioctl) { 
> +	ret = st_ioctl_common(file, cmd_in, p);
> +	if (ret != -ENOTTY)
> +		return ret;
>  
> -		ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
> -
> -	}
> -	return ret;
> +	return scsi_compat_ioctl(STp->device, cmd_in, p);
>  }
>  #endif
>  
> diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
> index 358ea2ecf36b..ab4471f469e6 100644
> --- a/fs/compat_ioctl.c
> +++ b/fs/compat_ioctl.c
> @@ -36,109 +36,11 @@
>  
>  #include "internal.h"
>  
> -#ifdef CONFIG_BLOCK
> -#include <linux/cdrom.h>
> -#include <linux/fd.h>
> -#include <scsi/scsi.h>
> -#include <scsi/scsi_ioctl.h>
> -#include <scsi/sg.h>
> -#endif
> -
>  #include <linux/uaccess.h>
>  #include <linux/watchdog.h>
>  
>  #include <linux/hiddev.h>
>  
> -
> -#include <linux/sort.h>
> -
> -/*
> - * simple reversible transform to make our table more evenly
> - * distributed after sorting.
> - */
> -#define XFORM(i) (((i) ^ ((i) << 27) ^ ((i) << 17)) & 0xffffffff)
> -
> -#define COMPATIBLE_IOCTL(cmd) XFORM((u32)cmd),
> -static unsigned int ioctl_pointer[] = {
> -#ifdef CONFIG_BLOCK
> -/* Big S */
> -COMPATIBLE_IOCTL(SCSI_IOCTL_GET_IDLUN)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_DOORLOCK)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_DOORUNLOCK)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_TEST_UNIT_READY)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_GET_BUS_NUMBER)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_SEND_COMMAND)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_PROBE_HOST)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_GET_PCI)
> -#endif
> -#ifdef CONFIG_BLOCK
> -/* SG stuff */
> -COMPATIBLE_IOCTL(SG_IO)
> -COMPATIBLE_IOCTL(SG_GET_REQUEST_TABLE)
> -COMPATIBLE_IOCTL(SG_SET_TIMEOUT)
> -COMPATIBLE_IOCTL(SG_GET_TIMEOUT)
> -COMPATIBLE_IOCTL(SG_EMULATED_HOST)
> -COMPATIBLE_IOCTL(SG_GET_TRANSFORM)
> -COMPATIBLE_IOCTL(SG_SET_RESERVED_SIZE)
> -COMPATIBLE_IOCTL(SG_GET_RESERVED_SIZE)
> -COMPATIBLE_IOCTL(SG_GET_SCSI_ID)
> -COMPATIBLE_IOCTL(SG_SET_FORCE_LOW_DMA)
> -COMPATIBLE_IOCTL(SG_GET_LOW_DMA)
> -COMPATIBLE_IOCTL(SG_SET_FORCE_PACK_ID)
> -COMPATIBLE_IOCTL(SG_GET_PACK_ID)
> -COMPATIBLE_IOCTL(SG_GET_NUM_WAITING)
> -COMPATIBLE_IOCTL(SG_SET_DEBUG)
> -COMPATIBLE_IOCTL(SG_GET_SG_TABLESIZE)
> -COMPATIBLE_IOCTL(SG_GET_COMMAND_Q)
> -COMPATIBLE_IOCTL(SG_SET_COMMAND_Q)
> -COMPATIBLE_IOCTL(SG_GET_VERSION_NUM)
> -COMPATIBLE_IOCTL(SG_NEXT_CMD_LEN)
> -COMPATIBLE_IOCTL(SG_SCSI_RESET)
> -COMPATIBLE_IOCTL(SG_GET_REQUEST_TABLE)
> -COMPATIBLE_IOCTL(SG_SET_KEEP_ORPHAN)
> -COMPATIBLE_IOCTL(SG_GET_KEEP_ORPHAN)
> -#endif
> -};
> -
> -/*
> - * Convert common ioctl arguments based on their command number
> - *
> - * Please do not add any code in here. Instead, implement
> - * a compat_ioctl operation in the place that handleѕ the
> - * ioctl for the native case.
> - */
> -static long do_ioctl_trans(unsigned int cmd,
> -		 unsigned long arg, struct file *file)
> -{
> -	return -ENOIOCTLCMD;
> -}
> -
> -static int compat_ioctl_check_table(unsigned int xcmd)
> -{
> -#ifdef CONFIG_BLOCK
> -	int i;
> -	const int max = ARRAY_SIZE(ioctl_pointer) - 1;
> -
> -	BUILD_BUG_ON(max >= (1 << 16));
> -
> -	/* guess initial offset into table, assuming a
> -	   normalized distribution */
> -	i = ((xcmd >> 16) * max) >> 16;
> -
> -	/* do linear search up first, until greater or equal */
> -	while (ioctl_pointer[i] < xcmd && i < max)
> -		i++;
> -
> -	/* then do linear search down */
> -	while (ioctl_pointer[i] > xcmd && i > 0)
> -		i--;
> -
> -	return ioctl_pointer[i] == xcmd;
> -#else
> -	return 0;
> -#endif
> -}
> -
>  COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd,
>  		       compat_ulong_t, arg32)
>  {
> @@ -216,19 +118,9 @@ COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd,
>  				goto out_fput;
>  		}
>  
> -		if (!f.file->f_op->unlocked_ioctl)
> -			goto do_ioctl;
> -		break;
> -	}
> -
> -	if (compat_ioctl_check_table(XFORM(cmd)))
> -		goto found_handler;
> -
> -	error = do_ioctl_trans(cmd, arg, f.file);
> -	if (error == -ENOIOCTLCMD)
>  		error = -ENOTTY;
> -
> -	goto out_fput;
> +		goto out_fput;
> +	}
>  
>   found_handler:
>  	arg = (unsigned long)compat_ptr(arg);
> @@ -239,23 +131,3 @@ COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd,
>   out:
>  	return error;
>  }
> -
> -static int __init init_sys32_ioctl_cmp(const void *p, const void *q)
> -{
> -	unsigned int a, b;
> -	a = *(unsigned int *)p;
> -	b = *(unsigned int *)q;
> -	if (a > b)
> -		return 1;
> -	if (a < b)
> -		return -1;
> -	return 0;
> -}
> -
> -static int __init init_sys32_ioctl(void)
> -{
> -	sort(ioctl_pointer, ARRAY_SIZE(ioctl_pointer), sizeof(*ioctl_pointer),
> -		init_sys32_ioctl_cmp, NULL);
> -	return 0;
> -}
> -__initcall(init_sys32_ioctl);
> -- 
> 2.20.0