From: Andrew Morton <akpm@linux-foundation.org>

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>
---

 include/linux/mm.h |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff -puN include/linux/mm.h~page_mapping-add-ifdef-around-reference-to-swapper_space include/linux/mm.h
--- a/include/linux/mm.h~page_mapping-add-ifdef-around-reference-to-swapper_space
+++ a/include/linux/mm.h
@@ -605,9 +605,12 @@ static inline struct address_space *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;
 }
_