page_mapping(): add ifdef around reference to swapper_space

This fixes the superh build when the pageflags patches are applied.

But it shouldn't unless it's a gcc bug.

Cc: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 24659ed06ba..4f3c1b2f44d 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -605,9 +605,12 @@ static inline struct address_space *page_mapping(struct page *page)
         struct address_space *mapping = page->mapping;
 
         VM_BUG_ON(PageSlab(page));
+#ifdef CONFIG_SWAP
         if (unlikely(PageSwapCache(page)))
                 mapping = &swapper_space;
-        else if (unlikely((unsigned long)mapping & PAGE_MAPPING_ANON))
+        else
+#endif
+        if (unlikely((unsigned long)mapping & PAGE_MAPPING_ANON))
                 mapping = NULL;
         return mapping;
 }