From c80f5b9bf7c67e1338d04bc0cf21fe285c3a80df Mon Sep 17 00:00:00 2001
From: Carl Shapiro <cshapiro@google.com>
Date: Thu, 4 Apr 2013 14:18:52 -0700
Subject: runtime: use a distinct pattern to mark free blocks in need of
 zeroing

R=golang-dev, dvyukov, khr, cshapiro
CC=golang-dev
https://golang.org/cl/8392043
---
 src/pkg/runtime/malloc.goc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'src/pkg/runtime/malloc.goc')

diff --git a/src/pkg/runtime/malloc.goc b/src/pkg/runtime/malloc.goc
index a30129ffc1..f1d25a793f 100644
--- a/src/pkg/runtime/malloc.goc
+++ b/src/pkg/runtime/malloc.goc
@@ -160,7 +160,7 @@ runtime·free(void *v)
 	if(sizeclass == 0) {
 		// Large object.
 		size = s->npages<<PageShift;
-		*(uintptr*)(s->start<<PageShift) = 1;	// mark as "needs to be zeroed"
+		*(uintptr*)(s->start<<PageShift) = (uintptr)0xfeedfeedfeedfeedll;	// mark as "needs to be zeroed"
 		// Must mark v freed before calling unmarkspan and MHeap_Free:
 		// they might coalesce v into other spans and change the bitmap further.
 		runtime·markfreed(v, size);
@@ -170,7 +170,7 @@ runtime·free(void *v)
 		// Small object.
 		size = runtime·class_to_size[sizeclass];
 		if(size > sizeof(uintptr))
-			((uintptr*)v)[1] = 1;	// mark as "needs to be zeroed"
+			((uintptr*)v)[1] = (uintptr)0xfeedfeedfeedfeedll;	// mark as "needs to be zeroed"
 		// Must mark v freed before calling MCache_Free:
 		// it might coalesce v and other blocks into a bigger span
 		// and change the bitmap further.
-- 
cgit v1.3-5-g9baa