5 files changed, 73 insertions, 55 deletions

diff --git a/fs/proc/page.c b/fs/proc/page.c
index e9983837d08d..38dd88b7ce84 100644
--- a/fs/proc/page.c
+++ b/fs/proc/page.c
@@ -6,6 +6,7 @@
 #include <linux/mmzone.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
+#include <linux/hugetlb.h>
 #include <asm/uaccess.h>
 #include "internal.h"
 
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 03be7f29ca01..a05a5ef33391 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -11,6 +11,8 @@
 
 struct ctl_table;
 
+int PageHuge(struct page *page);
+
 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
 {
         return vma->vm_flags & VM_HUGETLB;
@@ -61,6 +63,11 @@ void hugetlb_change_protection(struct vm_area_struct *vma,
 
 #else /* !CONFIG_HUGETLB_PAGE */
 
+static inline int PageHuge(struct page *page)
+{
+        return 0;
+}
+
 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
 {
         return 0;
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 7b9b6015b2ec..a56e6f3ce979 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -578,41 +578,6 @@ static void free_huge_page(struct page *page)
                 hugetlb_put_quota(mapping, 1);
 }
 
-/*
- * Increment or decrement surplus_huge_pages.  Keep node-specific counters
- * balanced by operating on them in a round-robin fashion.
- * Returns 1 if an adjustment was made.
- */
-static int adjust_pool_surplus(struct hstate *h, int delta)
-{
-        static int prev_nid;
-        int nid = prev_nid;
-        int ret = 0;
-
-        VM_BUG_ON(delta != -1 && delta != 1);
-        do {
-                nid = next_node(nid, node_online_map);
-                if (nid == MAX_NUMNODES)
-                        nid = first_node(node_online_map);
-
-                /* To shrink on this node, there must be a surplus page */
-                if (delta < 0 && !h->surplus_huge_pages_node[nid])
-                        continue;
-                /* Surplus cannot exceed the total number of pages */
-                if (delta > 0 && h->surplus_huge_pages_node[nid] >=
-                                                h->nr_huge_pages_node[nid])
-                        continue;
-
-                h->surplus_huge_pages += delta;
-                h->surplus_huge_pages_node[nid] += delta;
-                ret = 1;
-                break;
-        } while (nid != prev_nid);
-
-        prev_nid = nid;
-        return ret;
-}
-
 static void prep_new_huge_page(struct hstate *h, struct page *page, int nid)
 {
         set_compound_page_dtor(page, free_huge_page);
@@ -623,6 +588,34 @@ static void prep_new_huge_page(struct hstate *h, struct page *page, int nid)
         put_page(page); /* free it into the hugepage allocator */
 }
 
+static void prep_compound_gigantic_page(struct page *page, unsigned long order)
+{
+        int i;
+        int nr_pages = 1 << order;
+        struct page *p = page + 1;
+
+        /* we rely on prep_new_huge_page to set the destructor */
+        set_compound_order(page, order);
+        __SetPageHead(page);
+        for (i = 1; i < nr_pages; i++, p = mem_map_next(p, page, i)) {
+                __SetPageTail(p);
+                p->first_page = page;
+        }
+}
+
+int PageHuge(struct page *page)
+{
+        compound_page_dtor *dtor;
+
+        if (!PageCompound(page))
+                return 0;
+
+        page = compound_head(page);
+        dtor = get_compound_page_dtor(page);
+
+        return dtor == free_huge_page;
+}
+
 static struct page *alloc_fresh_huge_page_node(struct hstate *h, int nid)
 {
         struct page *page;
@@ -1140,6 +1133,41 @@ static inline void try_to_free_low(struct hstate *h, unsigned long count)
 }
 #endif
 
+/*
+ * Increment or decrement surplus_huge_pages.  Keep node-specific counters
+ * balanced by operating on them in a round-robin fashion.
+ * Returns 1 if an adjustment was made.
+ */
+static int adjust_pool_surplus(struct hstate *h, int delta)
+{
+        static int prev_nid;
+        int nid = prev_nid;
+        int ret = 0;
+
+        VM_BUG_ON(delta != -1 && delta != 1);
+        do {
+                nid = next_node(nid, node_online_map);
+                if (nid == MAX_NUMNODES)
+                        nid = first_node(node_online_map);
+
+                /* To shrink on this node, there must be a surplus page */
+                if (delta < 0 && !h->surplus_huge_pages_node[nid])
+                        continue;
+                /* Surplus cannot exceed the total number of pages */
+                if (delta > 0 && h->surplus_huge_pages_node[nid] >=
+                                                h->nr_huge_pages_node[nid])
+                        continue;
+
+                h->surplus_huge_pages += delta;
+                h->surplus_huge_pages_node[nid] += delta;
+                ret = 1;
+                break;
+        } while (nid != prev_nid);
+
+        prev_nid = nid;
+        return ret;
+}
+
 #define persistent_huge_pages(h) (h->nr_huge_pages - h->surplus_huge_pages)
 static unsigned long set_max_huge_pages(struct hstate *h, unsigned long count)
 {
diff --git a/mm/internal.h b/mm/internal.h
index 4b1672a8cf76..b4ac332e8072 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -16,9 +16,6 @@
 void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
                 unsigned long floor, unsigned long ceiling);
 
-extern void prep_compound_page(struct page *page, unsigned long order);
-extern void prep_compound_gigantic_page(struct page *page, unsigned long order);
-
 static inline void set_page_count(struct page *page, int v)
 {
         atomic_set(&page->_count, v);
@@ -51,6 +48,8 @@ extern void putback_lru_page(struct page *page);
  */
 extern unsigned long highest_memmap_pfn;
 extern void __free_pages_bootmem(struct page *page, unsigned int order);
+extern void prep_compound_page(struct page *page, unsigned long order);
+
 
 /*
  * function for dealing with page's order in buddy system.
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8ca06d87dc1f..131655cdb6b2 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -300,23 +300,6 @@ void prep_compound_page(struct page *page, unsigned long order)
         }
 }
 
-#ifdef CONFIG_HUGETLBFS
-void prep_compound_gigantic_page(struct page *page, unsigned long order)
-{
-        int i;
-        int nr_pages = 1 << order;
-        struct page *p = page + 1;
-
-        set_compound_page_dtor(page, free_compound_page);
-        set_compound_order(page, order);
-        __SetPageHead(page);
-        for (i = 1; i < nr_pages; i++, p = mem_map_next(p, page, i)) {
-                __SetPageTail(p);
-                p->first_page = page;
-        }
-}
-#endif
-
 static int destroy_compound_page(struct page *page, unsigned long order)
 {
         int i;