From 6013c2ec4d0bf36ef346626e3242bbde0e774a89 Mon Sep 17 00:00:00 2001
From: Stefan Lankes <lankes@lfbs.rwth-aachen.de>
Date: Mon, 16 Jul 2012 23:05:46 +0200
Subject: [PATCH] add memory barriers to seralize load and store operations

=> required to clone a task
---
 arch/x86/kernel/gdt.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kernel/gdt.c b/arch/x86/kernel/gdt.c
index 5861a978..384d9cb8 100644
--- a/arch/x86/kernel/gdt.c
+++ b/arch/x86/kernel/gdt.c
@@ -67,7 +67,9 @@ int arch_fork(task_t* task)
 	id = task->id;
 
 	// copy kernel stack of the current task
+	mb();
 	memcpy(kstacks[id], kstacks[curr_task->id], KERNEL_STACK_SIZE);
+	mb();
 
 #ifdef CONFIG_X86_32
 	asm volatile ("mov %%esp, %0" : "=r"(esp));