linux-kernel - Re: [RFC PATCH 1/2] x86: Fix rbp saving in pt

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Message-ID: <20110107163347.GB3066@nowhere>
Date:	Fri, 7 Jan 2011 17:33:50 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Jan Beulich <JBeulich@...ell.com>
Cc:	"H. Peter Anvin" <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	Stephane Eranian <eranian@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Soeren Sandmann Pedersen <sandmann@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 1/2] x86: Fix rbp saving in pt_regs on irq entry

On Fri, Jan 07, 2011 at 04:13:58PM +0000, Jan Beulich wrote:
> >>> On 07.01.11 at 17:05, Frederic Weisbecker <fweisbec@...il.com> wrote:
> > Once I'll have perf callchain based on CFI ready, we'll perhaps find some 
> > issues
> > there. Although I guess there are already tools that can make use of that.
> 
> Is this to read that you're planning to do a re-spin of the CFI
> unwinding code (which I'm not allowed to submit another time,
> but which we've been using for years in SuSE distros) then?

Actually I couldn't test kernel CFI annotations with perf as we
keep the kernel unwinding under frame pointer style.

The CFI unwinding we'll do is only for userspace.
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