/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Complete helper definitions from Linux v6.18 include/linux/xarray.h.
 * Copyright (c) 2017 Microsoft Corporation
 * Author: Matthew Wilcox <willy@infradead.org>
 */

static inline bool xa_is_err(const void *entry)
{
	return unlikely(xa_is_internal(entry) &&
			entry >= xa_mk_internal(-MAX_ERRNO));
}

static inline int xa_err(void *entry)
{
	/* xa_to_internal() would not do sign extension. */
	if (xa_is_err(entry))
		return (long)entry >> 2;
	return 0;
}

static inline void *xa_mk_node(const struct xa_node *node)
{
	return (void *)((unsigned long)node | 2);
}

static inline struct xa_node *xa_to_node(const void *entry)
{
	return (struct xa_node *)((unsigned long)entry - 2);
}

static inline bool xa_is_node(const void *entry)
{
	return xa_is_internal(entry) && (unsigned long)entry > 4096;
}