perf tools: Enable libtraceevent dynamic linking

[linux-2.6-microblaze.git] / mm / swapfile.c

diff --git a/mm/swapfile.c b/mm/swapfile.c
index f039745..084a5b9 100644 (file)
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -219,6 +219,19 @@ offset_to_swap_extent(struct swap_info_struct *sis, unsigned long offset)
        BUG();
 }
 
+sector_t swap_page_sector(struct page *page)
+{
+       struct swap_info_struct *sis = page_swap_info(page);
+       struct swap_extent *se;
+       sector_t sector;
+       pgoff_t offset;
+
+       offset = __page_file_index(page);
+       se = offset_to_swap_extent(sis, offset);
+       sector = se->start_block + (offset - se->start_page);
+       return sector << (PAGE_SHIFT - 9);
+}
+
 /*
  * swap allocation tell device that a cluster of swap can now be discarded,
  * to allow the swap device to optimize its wear-levelling.