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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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