futex: Take hugepages into account when generating futex_key

[pandora-kernel.git] / include / linux / hugetlb.h

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index a2227f7..32697c1 100644 (file)
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -327,6 +327,17 @@ static inline unsigned hstate_index_to_shift(unsigned index)
        return hstates[index].order + PAGE_SHIFT;
 }
 
+pgoff_t __basepage_index(struct page *page);
+
+/* Return page->index in PAGE_SIZE units */
+static inline pgoff_t basepage_index(struct page *page)
+{
+       if (!PageCompound(page))
+               return page->index;
+
+       return __basepage_index(page);
+}
+
 #else
 struct hstate {};
 #define alloc_huge_page_node(h, nid) NULL
@@ -345,6 +356,11 @@ static inline unsigned int pages_per_huge_page(struct hstate *h)
        return 1;
 }
 #define hstate_index_to_shift(index) 0
+
+static inline pgoff_t basepage_index(struct page *page)
+{
+       return page->index;
+}
 #endif
 
 #endif /* _LINUX_HUGETLB_H */