[deliverable/lttng-modules.git] / include / lttng / utils.h

/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1) */
#ifndef _LTTNG_UTILS_H
#define _LTTNG_UTILS_H

/*
 * Copyright (C) 2020 Francis Deslauriers <francis.deslauriers@efficios.com>
 */

#include <linux/jhash.h>
#include <linux/string.h>
#include <linux/types.h>

static inline
struct hlist_head *utils_borrow_hash_table_bucket(
		struct hlist_head *hash_table,
		unsigned int hash_table_size,
		const char *event_name)
{
	size_t name_len;
	uint32_t hash;

	name_len = strlen(event_name);

	hash = jhash(event_name, name_len, 0);
	return &hash_table[hash & (hash_table_size - 1)];
}
#endif /* _LTTNG_UTILS_H */
Commit	Line	Data
4442bc1b JR	1	/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1) */
	2	#ifndef _LTTNG_UTILS_H
	3	#define _LTTNG_UTILS_H
	4
	5	/*
	6	* Copyright (C) 2020 Francis Deslauriers <francis.deslauriers@efficios.com>
	7	*/
	8
	9	#include <linux/jhash.h>
	10	#include <linux/string.h>
	11	#include <linux/types.h>
	12
	13	static inline
	14	struct hlist_head *utils_borrow_hash_table_bucket(
	15	struct hlist_head *hash_table,
	16	unsigned int hash_table_size,
	17	const char *event_name)
	18	{
	19	size_t name_len;
	20	uint32_t hash;
	21
	22	name_len = strlen(event_name);
	23
	24	hash = jhash(event_name, name_len, 0);
	25	return &hash_table[hash & (hash_table_size - 1)];
	26	}
	27	#endif /* _LTTNG_UTILS_H */