include/linux/node.h

   1 /*
   2  * include/linux/node.h - generic node definition
   3  *
   4  * This is mainly for topological representation. We define the
   5  * basic 'struct node' here, which can be embedded in per-arch
   6  * definitions of processors.
   7  *
   8  * Basic handling of the devices is done in drivers/base/node.c
   9  * and system devices are handled in drivers/base/sys.c.
  10  *
  11  * Nodes are exported via driverfs in the class/node/devices/
  12  * directory.
  13  *
  14  * Per-node interfaces can be implemented using a struct device_interface.
  15  * See the following for how to do this:
  16  * - drivers/base/intf.c
  17  * - Documentation/driver-model/interface.txt
  18  */
  19 #ifndef _LINUX_NODE_H_
  20 #define _LINUX_NODE_H_
  21
  22 #include <linux/sysdev.h>
  23 #include <linux/cpumask.h>
  24
  25 struct node {
  26         struct sys_device       sysdev;
  27 };
  28
  29 extern struct node node_devices[];
  30
  31 extern int register_node(struct node *, int, struct node *);
  32 extern void unregister_node(struct node *node);
  33 extern int register_one_node(int nid);
  34 extern void unregister_one_node(int nid);
  35 #ifdef CONFIG_NUMA
  36 extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
  37 extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
  38 #else
  39 static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
  40 {
  41         return 0;
  42 }
  43 static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
  44 {
  45         return 0;
  46 }
  47 #endif
  48
  49 #define to_node(sys_device) container_of(sys_device, struct node, sysdev)
  50
  51 #endif /* _LINUX_NODE_H_ */