linux-kernel - Re: 2.6.22-rcX Transmeta/APM regression

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Date:	Sat, 30 Jun 2007 11:26:40 +0200
From:	Andi Kleen <ak@...e.de>
To:	linux@...izon.com
Cc:	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	bk@...e.de, hpa@...or.com, michal.k.k.piotrowski@...il.com
Subject: Re: 2.6.22-rcX Transmeta/APM regression

On Saturday 30 June 2007 05:03, linux@...izon.com wrote:

> Anyway, the patch which introduces the problem is the aptly named 3ebad:
> 3ebad59056: [PATCH] x86: Save and restore the fixed-range MTRRs of the BSP
> when suspending
>
> 2.6.22-rc6 plus that one commit reverted successfully does APM suspend
> (and resume) for me.

Mr.Linux, Does that patch fix it? 

-Andi

i386: Check if CPU has MTRRs before trying to save them

Signed-off-by: Andi Kleen <ak@...e.de>

Index: linux/arch/i386/kernel/cpu/mtrr/main.c
===================================================================
--- linux.orig/arch/i386/kernel/cpu/mtrr/main.c
+++ linux/arch/i386/kernel/cpu/mtrr/main.c
@@ -734,8 +734,11 @@ void mtrr_ap_init(void)
  */
 void mtrr_save_state(void)
 {
-	int cpu = get_cpu();
+	int cpu;
 
+	if (!cpu_has_mtrr)
+		return;
+	cpu  = get_cpu();
 	if (cpu == 0)
 		mtrr_save_fixed_ranges(NULL);
 	else


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