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

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Message-ID: <20070630185706.3979.qmail@science.horizon.com>
Date:	30 Jun 2007 14:57:06 -0400
From:	linux@...izon.com
To:	ak@...e.de, akpm@...ux-foundation.org, linux@...izon.com
Cc:	bk@...e.de, hpa@...or.com, linux-kernel@...r.kernel.org,
	linux-pm@...ts.linux-foundation.org,
	michal.k.k.piotrowski@...il.com
Subject: Re: 2.6.22-rcX Transmeta/APM regression

Responding to various proposed fixes:

> 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

This does not change the symptoms in any way.

> --- a/arch/i386/kernel/cpu/mtrr/generic.c~i386-mtrr-crash-fix
> +++ a/arch/i386/kernel/cpu/mtrr/generic.c
> @@ -65,7 +65,8 @@ get_fixed_ranges(mtrr_type * frs)
>  
>  void mtrr_save_fixed_ranges(void *info)
>  {
> -	get_fixed_ranges(mtrr_state.fixed_ranges);
> +	if (cpu_has_mtrr)
> +		get_fixed_ranges(mtrr_state.fixed_ranges);
>  }
>  
>  static void print_fixed(unsigned base, unsigned step, const mtrr_type*types)

This works great, thanks!  Please consider the regression diagnosed and fixed.
-
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