linux-kernel - Re: [TRIVIAL PATCH 16/26] x86: Convert print

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Message-ID: <50CA4A3F.5040302@zytor.com>
Date:	Thu, 13 Dec 2012 13:35:59 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>, Joe Perches <joe@...ches.com>,
	"Luck, Tony" <tony.luck@...el.com>,
	Jiri Kosina <trivial@...nel.org>,
	Jeff Dike <jdike@...toit.com>,
	Richard Weinberger <richard@....at>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"user-mode-linux-devel@...ts.sourceforge.net" 
	<user-mode-linux-devel@...ts.sourceforge.net>,
	"user-mode-linux-user@...ts.sourceforge.net" 
	<user-mode-linux-user@...ts.sourceforge.net>
Subject: Re: [TRIVIAL PATCH 16/26] x86: Convert print_symbol to %pSR

On 12/13/2012 11:05 AM, Borislav Petkov wrote:
>
> Ok, I grok it now. So, in most cases, mce.ip comes from pt_regs.ip which
> is unsigned long so we're fine for both 32- and 64-bit. There's only the
> case with precise RIP reporting where we get the rip from an MSR but
> even then, it should be 4 bytes on 32-bit since our addresses there are
> 4 bytes.
>
> So, actually struct mce should've had ->ip defined as an unsigned long
> from the very beginning. But we can't change that now because this
> struct is shared with userspace :(
>

Good thing, then,. otherwise we'd have a compat headache.

	-hpa
-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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