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-rw-r--r--include/linux/mm_types.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index bb91658c603f..f8d1492a114f 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -143,8 +143,19 @@ struct page {
unsigned long compound_head; /* If bit zero is set */
/* First tail page only */
+#ifdef CONFIG_64BIT
+ /*
+ * On 64 bit system we have enough space in struct page
+ * to encode compound_dtor and compound_order with
+ * unsigned int. It can help compiler generate better or
+ * smaller code on some archtectures.
+ */
+ unsigned int compound_dtor;
+ unsigned int compound_order;
+#else
unsigned short int compound_dtor;
unsigned short int compound_order;
+#endif
};
#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && USE_SPLIT_PMD_PTLOCKS