drop_collected_paths(): constify arguments

... and use that to constify the pointers in callers

Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Author: Al Viro

fs/namespace.c

@@ -2334,9 +2334,9 @@ struct path *collect_paths(const struct path *path,
 	return res;
 }
 
-void drop_collected_paths(struct path *paths, struct path *prealloc)
+void drop_collected_paths(const struct path *paths, struct path *prealloc)
 {
-	for (struct path *p = paths; p->mnt; p++)
+	for (const struct path *p = paths; p->mnt; p++)
 		path_put(p);
 	if (paths != prealloc)
 		kfree(paths);

include/linux/mount.h

@@ -105,7 +105,7 @@ extern int may_umount(struct vfsmount *);
 int do_mount(const char *, const char __user *,
 		     const char *, unsigned long, void *);
 extern struct path *collect_paths(const struct path *, struct path *, unsigned);
-extern void drop_collected_paths(struct path *, struct path *);
+extern void drop_collected_paths(const struct path *, struct path *);
 extern void kern_unmount_array(struct vfsmount *mnt[], unsigned int num);
 
 extern int cifs_root_data(char **dev, char **opts);

kernel/audit_tree.c

@@ -678,7 +678,7 @@ void audit_trim_trees(void)
 		struct audit_tree *tree;
 		struct path path;
 		struct audit_node *node;
-		struct path *paths;
+		const struct path *paths;
 		struct path array[16];
 		int err;
 
@@ -701,7 +701,7 @@ void audit_trim_trees(void)
 			struct audit_chunk *chunk = find_chunk(node);
 			/* this could be NULL if the watch is dying else where... */
 			node->index |= 1U<<31;
-			for (struct path *p = paths; p->dentry; p++) {
+			for (const struct path *p = paths; p->dentry; p++) {
 				struct inode *inode = p->dentry->d_inode;
 				if (inode_to_key(inode) == chunk->key) {
 					node->index &= ~(1U<<31);
@@ -740,9 +740,9 @@ void audit_put_tree(struct audit_tree *tree)
 	put_tree(tree);
 }
 
-static int tag_mounts(struct path *paths, struct audit_tree *tree)
+static int tag_mounts(const struct path *paths, struct audit_tree *tree)
 {
-	for (struct path *p = paths; p->dentry; p++) {
+	for (const struct path *p = paths; p->dentry; p++) {
 		int err = tag_chunk(p->dentry->d_inode, tree);
 		if (err)
 			return err;
@@ -805,7 +805,7 @@ int audit_add_tree_rule(struct audit_krule *rule)
 	struct audit_tree *seed = rule->tree, *tree;
 	struct path path;
 	struct path array[16];
-	struct path *paths;
+	const struct path *paths;
 	int err;
 
 	rule->tree = NULL;
@@ -877,7 +877,7 @@ int audit_tag_tree(char *old, char *new)
 	int failed = 0;
 	struct path path1, path2;
 	struct path array[16];
-	struct path *paths;
+	const struct path *paths;
 	int err;
 
 	err = kern_path(new, 0, &path2);