+#ifdef CONFIG_HUGETLB_PAGE
+
+#define HSTATE_NAME_LEN 32
+/* Defines one hugetlb page size */
+struct hstate {
+ int next_nid_to_alloc;
+ int next_nid_to_free;
+ unsigned int order;
+ unsigned long mask;
+ unsigned long max_huge_pages;
+ unsigned long nr_huge_pages;
+ unsigned long free_huge_pages;
+ unsigned long resv_huge_pages;
+ unsigned long surplus_huge_pages;
+ unsigned long nr_overcommit_huge_pages;
+ struct list_head hugepage_freelists[MAX_NUMNODES];
+ unsigned int nr_huge_pages_node[MAX_NUMNODES];
+ unsigned int free_huge_pages_node[MAX_NUMNODES];
+ unsigned int surplus_huge_pages_node[MAX_NUMNODES];
+ char name[HSTATE_NAME_LEN];
+};
+
+struct huge_bootmem_page {
+ struct list_head list;
+ struct hstate *hstate;
+};
+
+/* arch callback */
+int __init alloc_bootmem_huge_page(struct hstate *h);
+
+void __init hugetlb_add_hstate(unsigned order);
+struct hstate *size_to_hstate(unsigned long size);
+
+#ifndef HUGE_MAX_HSTATE
+#define HUGE_MAX_HSTATE 1
+#endif
+
+extern struct hstate hstates[HUGE_MAX_HSTATE];
+extern unsigned int default_hstate_idx;
+
+#define default_hstate (hstates[default_hstate_idx])
+
+static inline struct hstate *hstate_inode(struct inode *i)
+{
+ struct hugetlbfs_sb_info *hsb;
+ hsb = HUGETLBFS_SB(i->i_sb);
+ return hsb->hstate;
+}
+
+static inline struct hstate *hstate_file(struct file *f)
+{
+ return hstate_inode(f->f_dentry->d_inode);
+}
+
+static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
+{
+ return hstate_file(vma->vm_file);
+}
+
+static inline unsigned long huge_page_size(struct hstate *h)
+{
+ return (unsigned long)PAGE_SIZE << h->order;
+}
+
+extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
+
+extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
+
+static inline unsigned long huge_page_mask(struct hstate *h)
+{
+ return h->mask;
+}
+
+static inline unsigned int huge_page_order(struct hstate *h)
+{
+ return h->order;
+}
+
+static inline unsigned huge_page_shift(struct hstate *h)
+{
+ return h->order + PAGE_SHIFT;
+}
+
+static inline unsigned int pages_per_huge_page(struct hstate *h)
+{
+ return 1 << h->order;
+}
+
+static inline unsigned int blocks_per_huge_page(struct hstate *h)
+{
+ return huge_page_size(h) / 512;
+}
+
+#include <asm/hugetlb.h>
+
+static inline struct hstate *page_hstate(struct page *page)
+{
+ return size_to_hstate(PAGE_SIZE << compound_order(page));
+}
+
+#else
+struct hstate {};
+#define alloc_bootmem_huge_page(h) NULL
+#define hstate_file(f) NULL
+#define hstate_vma(v) NULL
+#define hstate_inode(i) NULL
+#define huge_page_size(h) PAGE_SIZE
+#define huge_page_mask(h) PAGE_MASK
+#define vma_kernel_pagesize(v) PAGE_SIZE
+#define vma_mmu_pagesize(v) PAGE_SIZE
+#define huge_page_order(h) 0
+#define huge_page_shift(h) PAGE_SHIFT
+static inline unsigned int pages_per_huge_page(struct hstate *h)
+{
+ return 1;
+}
+#endif
+