1 files changed, 20 insertions, 0 deletions

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 8c43cc469d78..b65166de1d9d 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -6,6 +6,8 @@
 #include <linux/fs.h>
 #include <linux/hugetlb_inline.h>
 #include <linux/cgroup.h>
+#include <linux/list.h>
+#include <linux/kref.h>
 
 struct ctl_table;
 struct user_struct;
@@ -23,6 +25,14 @@ struct hugepage_subpool {
         long max_hpages, used_hpages;
 };
 
+struct resv_map {
+        struct kref refs;
+        spinlock_t lock;
+        struct list_head regions;
+};
+extern struct resv_map *resv_map_alloc(void);
+void resv_map_release(struct kref *ref);
+
 extern spinlock_t hugetlb_lock;
 extern int hugetlb_max_hstate __read_mostly;
 #define for_each_hstate(h) \
@@ -402,6 +412,16 @@ static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
         return &mm->page_table_lock;
 }
 
+static inline bool hugepages_supported(void)
+{
+        /*
+         * Some platform decide whether they support huge pages at boot
+         * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
+         * there is no such support
+         */
+        return HPAGE_SHIFT != 0;
+}
+
 #else   /* CONFIG_HUGETLB_PAGE */
 struct hstate {};
 #define alloc_huge_page_node(h, nid) NULL