1 files changed, 64 insertions, 63 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 856f0ee7e84a..7b703b6d4358 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -16,6 +16,7 @@
 #include <linux/mutex.h>
 #include <linux/debug_locks.h>
 #include <linux/backing-dev.h>
+#include <linux/mm_types.h>
 
 struct mempolicy;
 struct anon_vma;
@@ -198,6 +199,7 @@ struct vm_operations_struct {
         void (*open)(struct vm_area_struct * area);
         void (*close)(struct vm_area_struct * area);
         struct page * (*nopage)(struct vm_area_struct * area, unsigned long address, int *type);
+        unsigned long (*nopfn)(struct vm_area_struct * area, unsigned long address);
         int (*populate)(struct vm_area_struct * area, unsigned long address, unsigned long len, pgprot_t prot, unsigned long pgoff, int nonblock);
 
         /* notification that a previously read-only page is about to become
@@ -215,62 +217,6 @@ struct vm_operations_struct {
 struct mmu_gather;
 struct inode;
 
-/*
- * Each physical page in the system has a struct page associated with
- * it to keep track of whatever it is we are using the page for at the
- * moment. Note that we have no way to track which tasks are using
- * a page, though if it is a pagecache page, rmap structures can tell us
- * who is mapping it.
- */
-struct page {
-        unsigned long flags;            /* Atomic flags, some possibly
-                                         * updated asynchronously */
-        atomic_t _count;                /* Usage count, see below. */
-        atomic_t _mapcount;             /* Count of ptes mapped in mms,
-                                         * to show when page is mapped
-                                         * & limit reverse map searches.
-                                         */
-        union {
-            struct {
-                unsigned long private;          /* Mapping-private opaque data:
-                                                 * usually used for buffer_heads
-                                                 * if PagePrivate set; used for
-                                                 * swp_entry_t if PageSwapCache;
-                                                 * indicates order in the buddy
-                                                 * system if PG_buddy is set.
-                                                 */
-                struct address_space *mapping;  /* If low bit clear, points to
-                                                 * inode address_space, or NULL.
-                                                 * If page mapped as anonymous
-                                                 * memory, low bit is set, and
-                                                 * it points to anon_vma object:
-                                                 * see PAGE_MAPPING_ANON below.
-                                                 */
-            };
-#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
-            spinlock_t ptl;
-#endif
-        };
-        pgoff_t index;                  /* Our offset within mapping. */
-        struct list_head lru;           /* Pageout list, eg. active_list
-                                         * protected by zone->lru_lock !
-                                         */
-        /*
-         * On machines where all RAM is mapped into kernel address space,
-         * we can simply calculate the virtual address. On machines with
-         * highmem some memory is mapped into kernel virtual memory
-         * dynamically, so we need a place to store that address.
-         * Note that this field could be 16 bits on x86 ... ;)
-         *
-         * Architectures with slow multiplication can define
-         * WANT_PAGE_VIRTUAL in asm/page.h
-         */
-#if defined(WANT_PAGE_VIRTUAL)
-        void *virtual;                  /* Kernel virtual address (NULL if
-                                           not kmapped, ie. highmem) */
-#endif /* WANT_PAGE_VIRTUAL */
-};
-
 #define page_private(page)              ((page)->private)
 #define set_page_private(page, v)       ((page)->private = (v))
 
@@ -501,7 +447,11 @@ static inline struct zone *page_zone(struct page *page)
 
 static inline unsigned long zone_to_nid(struct zone *zone)
 {
-        return zone->zone_pgdat->node_id;
+#ifdef CONFIG_NUMA
+        return zone->node;
+#else
+        return 0;
+#endif
 }
 
 static inline unsigned long page_to_nid(struct page *page)
@@ -546,11 +496,6 @@ static inline void set_page_links(struct page *page, enum zone_type zone,
  */
 #include <linux/vmstat.h>
 
-#ifndef CONFIG_DISCONTIGMEM
-/* The array of struct pages - for discontigmem use pgdat->lmem_map */
-extern struct page *mem_map;
-#endif
-
 static __always_inline void *lowmem_page_address(struct page *page)
 {
         return __va(page_to_pfn(page) << PAGE_SHIFT);
@@ -650,6 +595,12 @@ static inline int page_mapped(struct page *page)
 #define NOPAGE_OOM      ((struct page *) (-1))
 
 /*
+ * Error return values for the *_nopfn functions
+ */
+#define NOPFN_SIGBUS    ((unsigned long) -1)
+#define NOPFN_OOM       ((unsigned long) -2)
+
+/*
  * Different kinds of faults, as returned by handle_mm_fault().
  * Used to decide whether a process gets delivered SIGBUS or
  * just gets major/minor fault counters bumped up.
@@ -937,6 +888,56 @@ extern void free_area_init(unsigned long * zones_size);
 extern void free_area_init_node(int nid, pg_data_t *pgdat,
         unsigned long * zones_size, unsigned long zone_start_pfn, 
         unsigned long *zholes_size);
+#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
+/*
+ * With CONFIG_ARCH_POPULATES_NODE_MAP set, an architecture may initialise its
+ * zones, allocate the backing mem_map and account for memory holes in a more
+ * architecture independent manner. This is a substitute for creating the
+ * zone_sizes[] and zholes_size[] arrays and passing them to
+ * free_area_init_node()
+ *
+ * An architecture is expected to register range of page frames backed by
+ * physical memory with add_active_range() before calling
+ * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
+ * usage, an architecture is expected to do something like
+ *
+ * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
+ *                                                       max_highmem_pfn};
+ * for_each_valid_physical_page_range()
+ *      add_active_range(node_id, start_pfn, end_pfn)
+ * free_area_init_nodes(max_zone_pfns);
+ *
+ * If the architecture guarantees that there are no holes in the ranges
+ * registered with add_active_range(), free_bootmem_active_regions()
+ * will call free_bootmem_node() for each registered physical page range.
+ * Similarly sparse_memory_present_with_active_regions() calls
+ * memory_present() for each range when SPARSEMEM is enabled.
+ *
+ * See mm/page_alloc.c for more information on each function exposed by
+ * CONFIG_ARCH_POPULATES_NODE_MAP
+ */
+extern void free_area_init_nodes(unsigned long *max_zone_pfn);
+extern void add_active_range(unsigned int nid, unsigned long start_pfn,
+                                        unsigned long end_pfn);
+extern void shrink_active_range(unsigned int nid, unsigned long old_end_pfn,
+                                                unsigned long new_end_pfn);
+extern void push_node_boundaries(unsigned int nid, unsigned long start_pfn,
+                                        unsigned long end_pfn);
+extern void remove_all_active_ranges(void);
+extern unsigned long absent_pages_in_range(unsigned long start_pfn,
+                                                unsigned long end_pfn);
+extern void get_pfn_range_for_nid(unsigned int nid,
+                        unsigned long *start_pfn, unsigned long *end_pfn);
+extern unsigned long find_min_pfn_with_active_regions(void);
+extern unsigned long find_max_pfn_with_active_regions(void);
+extern void free_bootmem_with_active_regions(int nid,
+                                                unsigned long max_low_pfn);
+extern void sparse_memory_present_with_active_regions(int nid);
+#ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
+extern int early_pfn_to_nid(unsigned long pfn);
+#endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
+#endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
+extern void set_dma_reserve(unsigned long new_dma_reserve);
 extern void memmap_init_zone(unsigned long, int, unsigned long, unsigned long);
 extern void setup_per_zone_pages_min(void);
 extern void mem_init(void);
@@ -1130,7 +1131,7 @@ void drop_slab(void);
 extern int randomize_va_space;
 #endif
 
-const char *arch_vma_name(struct vm_area_struct *vma);
+__attribute__((weak)) const char *arch_vma_name(struct vm_area_struct *vma);
 
 #endif /* __KERNEL__ */
 #endif /* _LINUX_MM_H */