constify ksys_mount() string arguments

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

drivers/base/devtmpfs.c

@@ -357,8 +357,7 @@ int devtmpfs_mount(const char *mntdir)
 	if (!thread)
 		return 0;
 
-	err = ksys_mount("devtmpfs", (char *)mntdir, "devtmpfs", MS_SILENT,
-			 NULL);
+	err = ksys_mount("devtmpfs", mntdir, "devtmpfs", MS_SILENT, NULL);
 	if (err)
 		printk(KERN_INFO "devtmpfs: error mounting %i\n", err);
 	else

fs/namespace.c

@@ -3295,8 +3295,8 @@ struct dentry *mount_subtree(struct vfsmount *m, const char *name)
 }
 EXPORT_SYMBOL(mount_subtree);
 
-int ksys_mount(char __user *dev_name, char __user *dir_name, char __user *type,
-	       unsigned long flags, void __user *data)
+int ksys_mount(const char __user *dev_name, const char __user *dir_name,
+	       const char __user *type, unsigned long flags, void __user *data)
 {
 	int ret;
 	char *kernel_type;

include/linux/syscalls.h

@@ -1228,8 +1228,8 @@ asmlinkage long sys_ni_syscall(void);
  * the ksys_xyzyyz() functions prototyped below.
  */
 
-int ksys_mount(char __user *dev_name, char __user *dir_name, char __user *type,
-	       unsigned long flags, void __user *data);
+int ksys_mount(const char __user *dev_name, const char __user *dir_name,
+	       const char __user *type, unsigned long flags, void __user *data);
 int ksys_umount(char __user *name, int flags);
 int ksys_dup(unsigned int fildes);
 int ksys_chroot(const char __user *filename);