staging/lustre: Add __user attributes to libcfs_ioctl_get/popdata args

Just make clear which pointers are from userspace and which are not in
libcfs_ioctl_getdata/libcfs_ioctl_popdata and their callers.
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/include/linux/libcfs/libcfs_ioctl.h

@@ -207,7 +207,7 @@ static inline int libcfs_ioctl_is_invalid(struct libcfs_ioctl_data *data)
 
 int libcfs_register_ioctl(struct libcfs_ioctl_handler *hand);
 int libcfs_deregister_ioctl(struct libcfs_ioctl_handler *hand);
-int libcfs_ioctl_getdata(char *buf, char *end, void *arg);
-int libcfs_ioctl_popdata(void *arg, void *buf, int size);
+int libcfs_ioctl_getdata(char *buf, char *end, void __user *arg);
+int libcfs_ioctl_popdata(void __user *arg, void *buf, int size);
 
 #endif /* __LIBCFS_IOCTL_H__ */

drivers/staging/lustre/lustre/libcfs/linux/linux-module.c

@@ -40,7 +40,7 @@
 
 #define LNET_MINOR 240
 
-int libcfs_ioctl_getdata(char *buf, char *end, void *arg)
+int libcfs_ioctl_getdata(char *buf, char *end, void __user *arg)
 {
 	struct libcfs_ioctl_hdr   *hdr;
 	struct libcfs_ioctl_data  *data;
@@ -88,9 +88,9 @@ int libcfs_ioctl_getdata(char *buf, char *end, void *arg)
 	return 0;
 }
 
-int libcfs_ioctl_popdata(void *arg, void *data, int size)
+int libcfs_ioctl_popdata(void __user *arg, void *data, int size)
 {
-	if (copy_to_user((char *)arg, data, size))
+	if (copy_to_user(arg, data, size))
 		return -EFAULT;
 	return 0;
 }

drivers/staging/lustre/lustre/libcfs/module.c

@@ -116,7 +116,7 @@ int libcfs_deregister_ioctl(struct libcfs_ioctl_handler *hand)
 EXPORT_SYMBOL(libcfs_deregister_ioctl);
 
 static int libcfs_ioctl_int(struct cfs_psdev_file *pfile, unsigned long cmd,
-			    void *arg, struct libcfs_ioctl_data *data)
+			    void __user *arg, struct libcfs_ioctl_data *data)
 {
 	int err = -EINVAL;
 
@@ -157,7 +157,8 @@ static int libcfs_ioctl_int(struct cfs_psdev_file *pfile, unsigned long cmd,
 	return err;
 }
 
-static int libcfs_ioctl(struct cfs_psdev_file *pfile, unsigned long cmd, void *arg)
+static int libcfs_ioctl(struct cfs_psdev_file *pfile, unsigned long cmd,
+			void __user *arg)
 {
 	char    *buf;
 	struct libcfs_ioctl_data *data;