linux-kernel - Re: [PATCH 01/21] x86: add methods for writing of an MSR on several CPUs

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Message-ID: <49F890D0.7000109@zytor.com>
Date:	Wed, 29 Apr 2009 10:39:28 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <borislav.petkov@....com>
CC:	akpm@...ux-foundation.org, greg@...ah.com, mingo@...e.hu,
	tglx@...utronix.de, dougthompson@...ssion.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/21] x86: add methods for writing of an MSR on several
 CPUs

Borislav Petkov wrote:
> +}
> +
> +/* rdmsr on a bunch of cpus
> + *
> + * @mask:	which cpus
> + * @msr_no:	which MSR
> + * @l:		array of the lower 32-bit MSR values
> + * @h:		array of the higher 32-bit MSR values
> + *

Urk!

Please, for the love of God, no!

Make it an array of u64s or (equivalently!) an array of (l,h)
structures, not separate arrays for the halves of the register.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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