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

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Date:	Thu, 5 Jul 2012 23:20:39 -0700
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, eranian@...gle.com, hpa@...or.com,
	mingo@...nel.org, torvalds@...ux-foundation.org,
	a.p.zijlstra@...llo.nl, fweisbec@...il.com,
	akpm@...ux-foundation.org, tglx@...utronix.de
Subject: [tip:perf/core] perf/x86: Fix USER/KERNEL tagging of samples

Commit-ID:  ce5c1fe9a9e059b5c58f0a7e2a3e687d0efac815
Gitweb:     http://git.kernel.org/tip/ce5c1fe9a9e059b5c58f0a7e2a3e687d0efac815
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Wed, 20 Jun 2012 11:11:38 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 5 Jul 2012 20:59:07 +0200

perf/x86: Fix USER/KERNEL tagging of samples

Several perf interrupt handlers (PEBS,IBS,BTS) re-write regs->ip but
do not update the segment registers. So use an regs->ip based test
instead of an regs->cs/regs->flags based test.

Reported-and-tested-by: Stephane Eranian <eranian@...gle.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Link: http://lkml.kernel.org/n/tip-xxrt0a1zronm1sm36obwc2vy@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/cpu/perf_event.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index c4706cf..6ef9d41 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -1863,7 +1863,7 @@ unsigned long perf_misc_flags(struct pt_regs *regs)
 		else
 			misc |= PERF_RECORD_MISC_GUEST_KERNEL;
 	} else {
-		if (user_mode(regs))
+		if (!kernel_ip(regs->ip))
 			misc |= PERF_RECORD_MISC_USER;
 		else
 			misc |= PERF_RECORD_MISC_KERNEL;
--
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