linux-kernel - Re: [Bug 11388] New: 2.6.27-rc3 warns about MTRR range; only 3 of 16gb of memory is usable

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Message-ID: <20080822035144.GC30284@elte.hu>
Date:	Fri, 22 Aug 2008 05:51:44 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	bugme-daemon@...zilla.kernel.org, linux-kernel@...r.kernel.org,
	j_kernel@...litt.com
Subject: Re: [Bug 11388] New: 2.6.27-rc3 warns about MTRR range; only 3 of
	16gb of memory is usable


* Yinghai Lu <yhlu.kernel@...il.com> wrote:

> On Thu, Aug 21, 2008 at 4:56 AM, Ingo Molnar <mingo@...e.hu> wrote:
> >
> > * Ingo Molnar <mingo@...e.hu> wrote:
> >
> >>
> >> * Yinghai Lu <yhlu.kernel@...il.com> wrote:
> >>
> >> > [PATCH] x86_64: printout msr
> >>
> >> looks rather useful - added it to tip/x86/debug.
> >
> > fails to build with the attached config:
> >
> > arch/x86/kernel/cpu/common_64.c: In function 'print_cpu_msr':
> > arch/x86/kernel/cpu/common_64.c:456: error: implicit declaration of function 'rdmsrl_amd_safe'
> > arch/x86/kernel/cpu/common_64.c: In function 'print_cpu_info':
> > arch/x86/kernel/cpu/common_64.c:486: error: 'struct cpuinfo_x86' has no member named 'cpu_index'
> >
> > i realize that this wasnt sent for inclusion, but i think it would make
> > sense to tidy it up and integrate it.
> 
> that was one tool to verify if BIOS does right thing about some special bits.
> 
> it seems it doesn't compile when xen etc is enable in config.

yeah - but would be nice to fix it, as it's a useful diagnostic patch. 
If people have similar problems in the future they can boot their distro 
kernels with show_mtrr=x to get a MTRR dump.

	Ingo
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