linux-kernel - Re: [PATCH 1/3] x86, intel: Output microcode revision v6

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Message-ID: <4E967930.1020409@kernel.org>
Date:	Wed, 12 Oct 2011 22:37:52 -0700
From:	"H. Peter Anvin" <hpa@...nel.org>
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 v6

On 10/12/2011 05:46 PM, Andi Kleen wrote:
> 
> I had to add a memory barrier to native_cpuid to prevent it being
> optimized away when the result is not used.
> 

This is BAD... this means gcc is optimizing away an asm volatile, which
should never happen.  Please report a gcc bug.  What version of gcc is this?

Other than that,

Acked-by: H. Peter Anvin <hpa@...or.com>
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