From: Greg Kroah-Hartman <gregkh@suse.de>
Subject: Linux 2.6.27.5

Upstream 2.6.27.5 release from kernel.org

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

Automatically created from "patches.kernel.org/patch-2.6.27.4-5" by xen-port-patches.py

Index: head-2008-11-25/arch/x86/kernel/process_64-xen.c
===================================================================
--- head-2008-11-25.orig/arch/x86/kernel/process_64-xen.c	2008-11-25 13:34:32.000000000 +0100
+++ head-2008-11-25/arch/x86/kernel/process_64-xen.c	2008-11-10 12:12:28.000000000 +0100
@@ -786,12 +786,12 @@ unsigned long get_wchan(struct task_stru
 	if (!p || p == current || p->state==TASK_RUNNING)
 		return 0; 
 	stack = (unsigned long)task_stack_page(p);
-	if (p->thread.sp < stack || p->thread.sp > stack+THREAD_SIZE)
+	if (p->thread.sp < stack || p->thread.sp >= stack+THREAD_SIZE)
 		return 0;
 	fp = *(u64 *)(p->thread.sp);
 	do { 
 		if (fp < (unsigned long)stack ||
-		    fp > (unsigned long)stack+THREAD_SIZE)
+		    fp >= (unsigned long)stack+THREAD_SIZE)
 			return 0; 
 		ip = *(u64 *)(fp+8);
 		if (!in_sched_functions(ip))
Index: head-2008-11-25/arch/x86/mm/pat-xen.c
===================================================================
--- head-2008-11-25.orig/arch/x86/mm/pat-xen.c	2008-11-27 09:35:47.000000000 +0100
+++ head-2008-11-25/arch/x86/mm/pat-xen.c	2008-11-27 09:36:36.000000000 +0100
@@ -415,12 +415,16 @@ static inline int range_is_allowed(unsig
 	return 1;
 }
 #else
+/* This check is needed to avoid cache aliasing when PAT is enabled */
 static inline int range_is_allowed(unsigned long mfn, unsigned long size)
 {
 	u64 from = ((u64)mfn) << PAGE_SHIFT;
 	u64 to = from + size;
 	u64 cursor = from;
 
+	if (!pat_enabled)
+		return 1;
+
 	while (cursor < to) {
 		if (!devmem_is_allowed(mfn)) {
 			printk(KERN_INFO