lib/nodemask.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/nodemask.h>
   3 #include <linux/module.h>
   4 #include <linux/random.h>
   5
   6 int __next_node_in(int node, const nodemask_t *srcp)
   7 {
   8         int ret = __next_node(node, srcp);
   9
  10         if (ret == MAX_NUMNODES)
  11                 ret = __first_node(srcp);
  12         return ret;
  13 }
  14 EXPORT_SYMBOL(__next_node_in);
  15
  16 #ifdef CONFIG_NUMA
  17 /*
  18  * Return the bit number of a random bit set in the nodemask.
  19  * (returns NUMA_NO_NODE if nodemask is empty)
  20  */
  21 int node_random(const nodemask_t *maskp)
  22 {
  23         int w, bit = NUMA_NO_NODE;
  24
  25         w = nodes_weight(*maskp);
  26         if (w)
  27                 bit = bitmap_ord_to_pos(maskp->bits,
  28                         get_random_int() % w, MAX_NUMNODES);
  29         return bit;
  30 }
  31 #endif