[PATCH] compound pages optimisation

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/page-flags.h

@@ -291,7 +291,11 @@ extern unsigned long __read_page_state(unsigned offset);
 #define ClearPageReclaim(page)	clear_bit(PG_reclaim, &(page)->flags)
 #define TestClearPageReclaim(page) test_and_clear_bit(PG_reclaim, &(page)->flags)
 
+#ifdef CONFIG_HUGETLB_PAGE
 #define PageCompound(page)	test_bit(PG_compound, &(page)->flags)
+#else
+#define PageCompound(page)	0
+#endif
 #define SetPageCompound(page)	set_bit(PG_compound, &(page)->flags)
 #define ClearPageCompound(page)	clear_bit(PG_compound, &(page)->flags)