On Tue, Jul 21, 2020 at 06:28:15PM +0200, Christoph Hellwig wrote:

Add a simple helper to symlink with a kernel space file name and switch
the early init code over to it.  Remove the now unused ksys_symlink.

+int __init init_symlink(const char *oldname, const char *newname)
+{
+	struct filename *from = getname_kernel(oldname);

What the hell for?  You are only using from ->name later.

+	struct dentry *dentry;
+	struct path path;
+	int error;
+
+	if (IS_ERR(from))
+		return PTR_ERR(from);
+	dentry = kern_path_create(AT_FDCWD, newname, &path, 0);
+	error = PTR_ERR(dentry);
+	if (IS_ERR(dentry))
+		goto out_putname;
+	error = security_path_symlink(&path, dentry, from->name);
+	if (!error)
+		error = vfs_symlink(path.dentry->d_inode, dentry, from->name);
+	done_path_create(&path, dentry);
+out_putname:
+	putname(from);
+	return error;
+}

And again, the same comment regarding the location of file.