linux-kernel - Re: [PATCH 1/3] x86, intel: Output microcode revision v7

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Date:	Fri, 14 Oct 2011 09:21:51 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 1/3] x86, intel: Output microcode revision v7


* Andi Kleen <andi@...stfloor.org> wrote:

> From: Andi Kleen <ak@...ux.intel.com>
> 
> I got a request to make it easier to determine the microcode update level
> on Intel CPUs. This patch adds a new "microcode" field to /proc/cpuinfo.
> 
> The microcode level is also outputed on fatal machine checks together
> with the other CPUID model information.
> 
> I removed the respective code from the microcode update driver, it
> just reads the field from cpu_data. Also when the microcode is updated
> it fills in the new values too.
> 
> I had to add a memory barrier to native_cpuid to prevent it being
> optimized away when the result is not used.
> 
> This turns out to clean up further code which already got this
> information manually. This is done in followon patches.
> 
> v2:  Lots of updates based on feedback.
> v3:  Rename cpu_update to microcode. Misc changes from feedback.
> v4:  minor updates. rebased.
> v5:  move MSR read to early_intel_init()
> v6:  Use sync_core() instead of CPUID 1. Drop a white space change.
> v7:  Add Acked-bys.
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> Acked-by: H. Peter Anvin <hpa@...or.com>
> ---
>  arch/x86/include/asm/processor.h  |    4 +++-
>  arch/x86/kernel/cpu/intel.c       |    9 +++++++++
>  arch/x86/kernel/cpu/mcheck/mce.c  |    9 +++++++--
>  arch/x86/kernel/cpu/proc.c        |    2 ++
>  arch/x86/kernel/microcode_intel.c |   14 +++++---------
>  5 files changed, 26 insertions(+), 12 deletions(-)

Applied to tip:x86/microcode,

Thanks,

	Ingo
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