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 #include <linux/workqueue.h>
  25
  26 struct node {
  27         struct sys_device       sysdev;
  28
  29 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
  30         struct work_struct      node_work;
  31 #endif
  32 };
  33
  34 struct memory_block;
  35 extern struct node node_devices[];
  36 typedef  void (*node_registration_func_t)(struct node *);
  37
  38 extern int register_node(struct node *, int, struct node *);
  39 extern void unregister_node(struct node *node);
  40 #ifdef CONFIG_NUMA
  41 extern int register_one_node(int nid);
  42 extern void unregister_one_node(int nid);
  43 extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
  44 extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
  45 extern int register_mem_sect_under_node(struct memory_block *mem_blk,
  46                                                 int nid);
  47 extern int unregister_mem_sect_under_nodes(struct memory_block *mem_blk);
  48
  49 #ifdef CONFIG_HUGETLBFS
  50 extern void register_hugetlbfs_with_node(node_registration_func_t doregister,
  51                                          node_registration_func_t unregister);
  52 #endif
  53 #else
  54 static inline int register_one_node(int nid)
  55 {
  56         return 0;
  57 }
  58 static inline int unregister_one_node(int nid)
  59 {
  60         return 0;
  61 }
  62 static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
  63 {
  64         return 0;
  65 }
  66 static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
  67 {
  68         return 0;
  69 }
  70 static inline int register_mem_sect_under_node(struct memory_block *mem_blk,
  71                                                         int nid)
  72 {
  73         return 0;
  74 }
  75 static inline int unregister_mem_sect_under_nodes(struct memory_block *mem_blk)
  76 {
  77         return 0;
  78 }
  79
  80 static inline void register_hugetlbfs_with_node(node_registration_func_t reg,
  81                                                 node_registration_func_t unreg)
  82 {
  83 }
  84 #endif
  85
  86 #define to_node(sys_device) container_of(sys_device, struct node, sysdev)
  87
  88 #endif /* _LINUX_NODE_H_ */