2 files changed, 5 insertions, 1 deletions
diff --git a/ChangeLog b/ChangeLog
index a323481e54..f27606dc6e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat Jan  9 05:45:40 2016  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c: PAGE_BITMAP_PLANES (the number of bitmap) is 4, not 3.
+
 Sat Jan  9 05:42:57 2016  Koichi Sasada  <ko1@atdot.net>
 
 	* gc.c: rename constant names HEAP_* to PAGE_*.
diff --git a/gc.c b/gc.c
index f9e131bfcb..48d9acb9c7 100644
--- a/gc.c
+++ b/gc.c
@@ -638,7 +638,7 @@ enum {
     PAGE_OBJ_LIMIT = (unsigned int)((PAGE_SIZE - sizeof(struct heap_page_header))/sizeof(struct RVALUE)),
     PAGE_BITMAP_LIMIT = CEILDIV(CEILDIV(PAGE_SIZE, sizeof(struct RVALUE)), BITS_BITLENGTH),
     PAGE_BITMAP_SIZE = (BITS_SIZE * PAGE_BITMAP_LIMIT),
-    PAGE_BITMAP_PLANES = USE_RGENGC ? 3 : 1 /* RGENGC: mark bits, rememberset bits and oldgen bits */
+    PAGE_BITMAP_PLANES = USE_RGENGC ? 4 : 1 /* RGENGC: mark, unprotected, uncollectible, marking */
 };
 
 struct heap_page {