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Date: Mon, 23 Apr 2012 11:32:22 -0400 From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> To: "Luck, Tony" <tony.luck@...el.com> Cc: Borislav Petkov <bp@...64.org>, "Liu, Jinsong" <jinsong.liu@...el.com>, "x86@...nel.org" <x86@...nel.org>, "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>, "xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>, Thomas Gleixner <tglx@...utronix.de> Subject: Re: [Xen-devel] [PATCH 1/3] Add mcelog support for xen platform On Mon, Apr 23, 2012 at 03:27:32PM +0000, Luck, Tony wrote: > > Because, if you'd hooked into it, just imagine one fine day, when we > > remove mcelog support, what screaming the xen people will be doing when > > mcelog doesn't work anymore. > > Agreed. Even before we get to deleting mcelog, "struct mce" can change (new > fields could be added) ... and you don't want to have your hypervisor to > have to know which version of Linux it is talking to. I am having a hard time seeing how this is different from 'struct mce' changing and the hardware remaining the same? Can't the MCE check drivers deal with that - I mean that is their purpose - to extract some "blob" of data from the hardware, massage it in the software structure, and send its way. If you add some more fields in the software structure - either the hardware can provide it or not. If not, it will have to emulate it. This would be the same case with this driver. This driver is _not_ doing a strict bit-by-bit copy of 'struct mcinfo' to 'struct mce'. It is plucking the right bits and setting them in 'struct mce'. -- 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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