From 295a4d8e6433e8a8b6df25375fb780b0f75ff4e6 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Sat, 22 Dec 2012 15:06:28 -0500
Subject: runtime: ignore failure from madvise

When we release memory to the OS, if the OS doesn't want us
to release it (for example, because the program executed
mlockall(MCL_FUTURE)), madvise will fail. Ignore the failure
instead of crashing.

Fixes #3435.

R=ken2
CC=golang-dev
https://golang.org/cl/6998052
---
 src/pkg/runtime/sys_linux_amd64.s | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

(limited to 'src/pkg/runtime/sys_linux_amd64.s')

diff --git a/src/pkg/runtime/sys_linux_amd64.s b/src/pkg/runtime/sys_linux_amd64.s
index 3f7a207f37..e459437582 100644
--- a/src/pkg/runtime/sys_linux_amd64.s
+++ b/src/pkg/runtime/sys_linux_amd64.s
@@ -250,9 +250,7 @@ TEXT runtime·madvise(SB),7,$0
 	MOVQ	24(SP), DX
 	MOVQ	$28, AX	// madvise
 	SYSCALL
-	CMPQ	AX, $0xfffffffffffff001
-	JLS	2(PC)
-	MOVL	$0xf1, 0xf1  // crash
+	// ignore failure - maybe pages are locked
 	RET
 
 // int64 futex(int32 *uaddr, int32 op, int32 val,
-- 
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