linux-kernel - Re: [PATCH] x86: Remove 6 bank limitation in 64 bit MCE reporting code

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Message-ID: <4823705E.1040401@zytor.com>
Date:	Thu, 08 May 2008 14:27:58 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Venki Pallipadi <venkatesh.pallipadi@...el.com>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Suresh B Siddha <suresh.b.siddha@...el.com>,
	arjan@...radead.org, Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH] x86: Remove 6 bank limitation in 64 bit MCE reporting
 code

Venki Pallipadi wrote:
> Eliminate the 6 bank restriction in 64 bit mce reporting code. This restriction
> is artificial (due to static creation of sysfs files) and 32 bit code
> does not have any such restriction.
> 
> This change helps in reporting the details of machine checks on a machine check
> exception with errors in bank 6 and above on CPUs that support those banks.
> Without the patch, machine check errors in those banks are not reported.
> 
> We still have 128 (MCE_EXTENDED_BANK) bank restriction instead of max 256
> supported in hardware. That is not changed in the patch below as it will have
> some user level mcelog utility dependency, with bank 128 being used for
> thermal reporting currently.
> 
> The patch below does not create sysfs control (bankNctl) for banks higher
> than 6 as well. That needs some pre-cleanup in /sysfs mce layout, removal of
> per cpu /sysfs entries for bankctl as they are really global system level
> control today. That change will follow. This basic change is critical to
> report the detailed errors on banks higher than 6.
> 
> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>

Any chance you could add unifying the 32 and 64-bit code to your list, 
since you're already working on eliminating differences there?

	-hpa
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