nommu: struct vm_region's vm_usage count need not be atomic

[safe/jmp/linux-2.6] / include / linux / memory.h

diff --git a/include/linux/memory.h b/include/linux/memory.h
index 86a6c0f..1adfe77 100644 (file)
--- a/include/linux/memory.h
+++ b/include/linux/memory.h
@@ -50,6 +50,19 @@ struct memory_notify {
        int status_change_nid;
 };
 
+/*
+ * During pageblock isolation, count the number of pages within the
+ * range [start_pfn, start_pfn + nr_pages) which are owned by code
+ * in the notifier chain.
+ */
+#define MEM_ISOLATE_COUNT      (1<<0)
+
+struct memory_isolate_notify {
+       unsigned long start_pfn;        /* Start of range to check */
+       unsigned int nr_pages;          /* # pages in range to check */
+       unsigned int pages_found;       /* # pages owned found by callbacks */
+};
+
 struct notifier_block;
 struct mem_section;
 
@@ -76,14 +89,28 @@ static inline int memory_notify(unsigned long val, void *v)
 {
        return 0;
 }
+static inline int register_memory_isolate_notifier(struct notifier_block *nb)
+{
+       return 0;
+}
+static inline void unregister_memory_isolate_notifier(struct notifier_block *nb)
+{
+}
+static inline int memory_isolate_notify(unsigned long val, void *v)
+{
+       return 0;
+}
 #else
 extern int register_memory_notifier(struct notifier_block *nb);
 extern void unregister_memory_notifier(struct notifier_block *nb);
+extern int register_memory_isolate_notifier(struct notifier_block *nb);
+extern void unregister_memory_isolate_notifier(struct notifier_block *nb);
 extern int register_new_memory(int, 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);
 extern int memory_notify(unsigned long val, void *v);
+extern int memory_isolate_notify(unsigned long val, void *v);
 extern struct memory_block *find_memory_block(struct mem_section *);
 #define CONFIG_MEM_BLOCK_SIZE  (PAGES_PER_SECTION<<PAGE_SHIFT)
 enum mem_add_context { BOOT, HOTPLUG };
@@ -100,6 +127,17 @@ enum mem_add_context { BOOT, HOTPLUG };
 #endif
 
 /*
+ * 'struct memory_accessor' is a generic interface to provide
+ * in-kernel access to persistent memory such as i2c or SPI EEPROMs
+ */
+struct memory_accessor {
+       ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset,
+                       size_t count);
+       ssize_t (*write)(struct memory_accessor *, const char *buf,
+                        off_t offset, size_t count);
+};
+
+/*
  * Kernel text modification mutex, used for code patching. Users of this lock
  * can sleep.
  */