1 files changed, 11 insertions, 2 deletions

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 3c62ed408492..e12cdc6d79ee 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -13,6 +13,7 @@
 #include <linux/gfp.h>
 #include <linux/bitops.h>
 #include <linux/hardirq.h> /* for in_interrupt() */
+#include <linux/hugetlb_inline.h>
 
 /*
  * Bits in mapping->flags.  The lower __GFP_BITS_SHIFT bits are the page
@@ -281,10 +282,16 @@ static inline loff_t page_offset(struct page *page)
         return ((loff_t)page->index) << PAGE_CACHE_SHIFT;
 }
 
+extern pgoff_t linear_hugepage_index(struct vm_area_struct *vma,
+                                     unsigned long address);
+
 static inline pgoff_t linear_page_index(struct vm_area_struct *vma,
                                         unsigned long address)
 {
-        pgoff_t pgoff = (address - vma->vm_start) >> PAGE_SHIFT;
+        pgoff_t pgoff;
+        if (unlikely(is_vm_hugetlb_page(vma)))
+                return linear_hugepage_index(vma, address);
+        pgoff = (address - vma->vm_start) >> PAGE_SHIFT;
         pgoff += vma->vm_pgoff;
         return pgoff >> (PAGE_CACHE_SHIFT - PAGE_SHIFT);
 }
@@ -423,8 +430,10 @@ static inline int fault_in_pages_readable(const char __user *uaddr, int size)
                 const char __user *end = uaddr + size - 1;
 
                 if (((unsigned long)uaddr & PAGE_MASK) !=
-                                ((unsigned long)end & PAGE_MASK))
+                                ((unsigned long)end & PAGE_MASK)) {
                         ret = __get_user(c, end);
+                        (void)c;
+                }
         }
         return ret;
 }