linux-kernel - Re: [patch 4/8] 2.6.22-rc3 perfmon2 : IBS implementation for AMD64

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Message-ID: <alpine.DEB.0.99.0706151149480.10812@chino.kir.corp.google.com>
Date:	Fri, 15 Jun 2007 11:52:21 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Robert Richter <robert.richter@....com>
cc:	Stephane Eranian <eranian@....hp.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: Re: [patch 4/8] 2.6.22-rc3 perfmon2 : IBS implementation for AMD64

On Fri, 15 Jun 2007, Robert Richter wrote:

> Index: linux-2.6.22-rc3/include/asm-i386/msr-index.h
> ===================================================================
> --- linux-2.6.22-rc3.orig/include/asm-i386/msr-index.h
> +++ linux-2.6.22-rc3/include/asm-i386/msr-index.h
> @@ -75,6 +75,18 @@
>  
>  /* K7/K8 MSRs. Not complete. See the architecture manual for a more
>     complete list. */
> +
> +/* K8 MSRs */
> +#define MSR_K8_TOP_MEM1			0xC001001A
> +#define MSR_K8_TOP_MEM2			0xC001001D
> +#define MSR_K8_SYSCFG			0xC0010010
> +#define MSR_K8_HWCR			0xC0010015
> +#define MSR_K8_ENABLE_C1E		0xc0010055

Please don't include mixed cases of hex digits.  This entire file has all 
hex digits in lowercase type, so please conform to that.

> +#define K8_MTRRFIXRANGE_DRAM_ENABLE	0x00040000 /* MtrrFixDramEn bit    */
> +#define K8_MTRRFIXRANGE_DRAM_MODIFY	0x00080000 /* MtrrFixDramModEn bit */
> +#define K8_MTRR_RDMEM_WRMEM_MASK	0x18181818 /* Mask: RdMem|WrMem    */

Masks like K8_MTRR_RDMEM_WRMEM_MASK are prone to bugs when the values they 
are testing change and somebody forgets to update the mask.  Can you make 
K8_MTRR_RDMEM_WRMEM_MASK defined to be the result of another preprocessor 
macro expression?  Or, even better, get rid of it completely and modify 
set_fixed_range()?
-
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