lib/hash.c

   1 /* General purpose hashing library
   2  *
   3  * That's a start of a kernel hashing library, which can be extended
   4  * with further algorithms in future. arch_fast_hash{2,}() will
   5  * eventually resolve to an architecture optimized implementation.
   6  *
   7  * Copyright 2013 Francesco Fusco <ffusco@redhat.com>
   8  * Copyright 2013 Daniel Borkmann <dborkman@redhat.com>
   9  * Copyright 2013 Thomas Graf <tgraf@redhat.com>
  10  * Licensed under the GNU General Public License, version 2.0 (GPLv2)
  11  */
  12
  13 #include <linux/jhash.h>
  14 #include <linux/hash.h>
  15 #include <linux/cache.h>
  16
  17 static struct fast_hash_ops arch_hash_ops __read_mostly = {
  18         .hash  = jhash,
  19         .hash2 = jhash2,
  20 };
  21
  22 u32 arch_fast_hash(const void *data, u32 len, u32 seed)
  23 {
  24         return arch_hash_ops.hash(data, len, seed);
  25 }
  26 EXPORT_SYMBOL_GPL(arch_fast_hash);
  27
  28 u32 arch_fast_hash2(const u32 *data, u32 len, u32 seed)
  29 {
  30         return arch_hash_ops.hash2(data, len, seed);
  31 }
  32 EXPORT_SYMBOL_GPL(arch_fast_hash2);
  33
  34 static int __init hashlib_init(void)
  35 {
  36         setup_arch_fast_hash(&arch_hash_ops);
  37         return 0;
  38 }
  39 early_initcall(hashlib_init);