include/asm-generic/topology.h

   1 /*
   2  * linux/include/asm-generic/topology.h
   3  *
   4  * Written by: Matthew Dobson, IBM Corporation
   5  *
   6  * Copyright (C) 2002, IBM Corp.
   7  *
   8  * All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  18  * NON INFRINGEMENT.  See the GNU General Public License for more
  19  * details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  *
  25  * Send feedback to <colpatch@us.ibm.com>
  26  */
  27 #ifndef _ASM_GENERIC_TOPOLOGY_H
  28 #define _ASM_GENERIC_TOPOLOGY_H
  29
  30 #ifndef CONFIG_NUMA
  31
  32 /* Other architectures wishing to use this simple topology API should fill
  33    in the below functions as appropriate in their own <asm/topology.h> file. */
  34 #ifndef cpu_to_node
  35 #define cpu_to_node(cpu)        ((void)(cpu),0)
  36 #endif
  37 #ifndef parent_node
  38 #define parent_node(node)       ((void)(node),0)
  39 #endif
  40 #ifndef node_to_cpumask
  41 #define node_to_cpumask(node)   ((void)node, cpu_online_map)
  42 #endif
  43 #ifndef node_to_first_cpu
  44 #define node_to_first_cpu(node) ((void)(node),0)
  45 #endif
  46 #ifndef pcibus_to_node
  47 #define pcibus_to_node(bus)     ((void)(bus), -1)
  48 #endif
  49
  50 #ifndef pcibus_to_cpumask
  51 #define pcibus_to_cpumask(bus)  (pcibus_to_node(bus) == -1 ? \
  52                                         CPU_MASK_ALL : \
  53                                         node_to_cpumask(pcibus_to_node(bus)) \
  54                                 )
  55 #endif
  56
  57 #endif  /* CONFIG_NUMA */
  58
  59 /* returns pointer to cpumask for specified node */
  60 #ifndef node_to_cpumask_ptr
  61
  62 #define node_to_cpumask_ptr(v, node)                                    \
  63                 cpumask_t _##v = node_to_cpumask(node);                 \
  64                 const cpumask_t *v = &_##v
  65
  66 #define node_to_cpumask_ptr_next(v, node)                               \
  67                           _##v = node_to_cpumask(node)
  68 #endif
  69
  70 #endif /* _ASM_GENERIC_TOPOLOGY_H */