linux-kernel - Re: [tip:perf/core] perf/x86: Fix USER/KERNEL tagging of samples

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Date:	Fri, 6 Jul 2012 11:16:57 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	mingo@...nel.org, hpa@...or.com, eranian@...gle.com,
	linux-kernel@...r.kernel.org, fweisbec@...il.com,
	akpm@...ux-foundation.org, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/core] perf/x86: Fix USER/KERNEL tagging of samples

On Fri, Jul 6, 2012 at 11:12 AM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
>
> PEBS, BTS, LBR don't have CS. PEBS does have eflags.
>
> If we cannot do this I'm not sure what we can do :/

Well, you're passed in a "pt_regs". Which *does* have CS, and has it right.

If some code then changes the values in the pt_regs, it is *that* code
that needs to think twice about what it does. Where is that code?

                 Linus
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