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

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Message-ID: <20080508221659.GA2759@linux-os.sc.intel.com>
Date:	Thu, 8 May 2008 15:16:59 -0700
From:	Venki Pallipadi <venkatesh.pallipadi@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Venki Pallipadi <venkatesh.pallipadi@...el.com>,
	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

On Thu, May 08, 2008 at 02:27:58PM -0700, H. Peter Anvin wrote:
> 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?
> 

It was tried earlier
http://www.ussg.iu.edu/hypermail/linux/kernel/0505.2/0982.html
but never made it.

Yes. Will add that to the todo list.

Thanks,
Venki
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