include/lttng/utils.h

   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 */