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- /*
- * include/linux/memory.h - generic memory definition
- *
- * This is mainly for topological representation. We define the
- * basic "struct memory_block" here, which can be embedded in per-arch
- * definitions or NUMA information.
- *
- * Basic handling of the devices is done in drivers/base/memory.c
- * and system devices are handled in drivers/base/sys.c.
- *
- * Memory block are exported via sysfs in the class/memory/devices/
- * directory.
- *
- */
- #ifndef _LINUX_MEMORY_H_
- #define _LINUX_MEMORY_H_
- #include <linux/sysdev.h>
- #include <linux/node.h>
- #include <linux/compiler.h>
- #include <asm/semaphore.h>
- struct memory_block {
- unsigned long phys_index;
- unsigned long state;
- /*
- * This serializes all state change requests. It isn't
- * held during creation because the control files are
- * created long after the critical areas during
- * initialization.
- */
- struct semaphore state_sem;
- int phys_device; /* to which fru does this belong? */
- void *hw; /* optional pointer to fw/hw data */
- int (*phys_callback)(struct memory_block *);
- struct sys_device sysdev;
- };
- /* These states are exposed to userspace as text strings in sysfs */
- #define MEM_ONLINE (1<<0) /* exposed to userspace */
- #define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */
- #define MEM_OFFLINE (1<<2) /* exposed to userspace */
- /*
- * All of these states are currently kernel-internal for notifying
- * kernel components and architectures.
- *
- * For MEM_MAPPING_INVALID, all notifier chains with priority >0
- * are called before pfn_to_page() becomes invalid. The priority=0
- * entry is reserved for the function that actually makes
- * pfn_to_page() stop working. Any notifiers that want to be called
- * after that should have priority <0.
- */
- #define MEM_MAPPING_INVALID (1<<3)
- struct notifier_block;
- struct mem_section;
- #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
- static inline int memory_dev_init(void)
- {
- return 0;
- }
- static inline int register_memory_notifier(struct notifier_block *nb)
- {
- return 0;
- }
- static inline void unregister_memory_notifier(struct notifier_block *nb)
- {
- }
- #else
- extern int register_new_memory(struct mem_section *);
- extern int unregister_memory_section(struct mem_section *);
- extern int memory_dev_init(void);
- extern int remove_memory_block(unsigned long, struct mem_section *, int);
- #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
- #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
- #define hotplug_memory_notifier(fn, pri) { \
- static struct notifier_block fn##_mem_nb = \
- { .notifier_call = fn, .priority = pri }; \
- register_memory_notifier(&fn##_mem_nb); \
- }
- #endif /* _LINUX_MEMORY_H_ */
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