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 #ifndef _LINUX_NODE_H_
  15 #define _LINUX_NODE_H_
  16
  17 #include <linux/sysdev.h>
  18 #include <linux/cpumask.h>
  19 #include <linux/workqueue.h>
  20
  21 struct node {
  22         struct sys_device       sysdev;
  23
  24 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
  25         struct work_struct      node_work;
  26 #endif
  27 };
  28
  29 struct memory_block;
  30 extern struct node node_devices[];
  31 typedef  void (*node_registration_func_t)(struct node *);
  32
  33 extern int register_node(struct node *, int, struct node *);
  34 extern void unregister_node(struct node *node);
  35 #ifdef CONFIG_NUMA
  36 extern int register_one_node(int nid);
  37 extern void unregister_one_node(int nid);
  38 extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
  39 extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
  40 extern int register_mem_sect_under_node(struct memory_block *mem_blk,
  41                                                 int nid);
  42 extern int unregister_mem_sect_under_nodes(struct memory_block *mem_blk);
  43
  44 #ifdef CONFIG_HUGETLBFS
  45 extern void register_hugetlbfs_with_node(node_registration_func_t doregister,
  46                                          node_registration_func_t unregister);
  47 #endif
  48 #else
  49 static inline int register_one_node(int nid)
  50 {
  51         return 0;
  52 }
  53 static inline int unregister_one_node(int nid)
  54 {
  55         return 0;
  56 }
  57 static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
  58 {
  59         return 0;
  60 }
  61 static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
  62 {
  63         return 0;
  64 }
  65 static inline int register_mem_sect_under_node(struct memory_block *mem_blk,
  66                                                         int nid)
  67 {
  68         return 0;
  69 }
  70 static inline int unregister_mem_sect_under_nodes(struct memory_block *mem_blk)
  71 {
  72         return 0;
  73 }
  74
  75 static inline void register_hugetlbfs_with_node(node_registration_func_t reg,
  76                                                 node_registration_func_t unreg)
  77 {
  78 }
  79 #endif
  80
  81 #define to_node(sys_device) container_of(sys_device, struct node, sysdev)
  82
  83 #endif /* _LINUX_NODE_H_ */