linux-kernel - [PATCH 0/5 v2] [RFC] ftrace: Fix bug with function tracing and lockdep

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Date:	Fri, 01 Jun 2012 10:57:02 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	linux-kernel@...r.kernel.org
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"H. Peter Anvin" <hpa@...or.com>, Dave Jones <davej@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 0/5 v2] [RFC] ftrace: Fix bug with function tracing and lockdep


This is an updated version with input from H. Peter Anvin and Peter Zijlstra.
It may still not be up to par to actually pull. I would like to hear
more comments from people.

Yes, the NMI/INT3/Lockdep is complex. But I believe this is the nature
of the beast. If someone can come up with a simpler solution, I'm all ears.
Right now, the upstream tree has a bug when enabling function tracer
when lockdep is enabled that may crash the system.

Thoughts on this?

-- Steve

These are in the latest tip/perf/urgent-2 tree, which can be found at:

  git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
tip/perf/urgent-2

Head SHA1: 5963e317b1e9d2a4511503916d8fd664bb8fa8fb


Steven Rostedt (5):
      ftrace: Synchronize variable setting with breakpoints
      ftrace: Use breakpoint method to update ftrace caller
      x86: Reset the debug_stack update counter
      x86: Allow nesting of the debug stack IDT setting
      ftrace/x86: Do not change stacks in DEBUG when calling lockdep

----
 arch/x86/include/asm/ftrace.h |    2 +-
 arch/x86/kernel/cpu/common.c  |    8 +++-
 arch/x86/kernel/entry_64.S    |   44 ++++++++++++++++--
 arch/x86/kernel/ftrace.c      |  102 ++++++++++++++++++++++++++++++++++++++---
 arch/x86/kernel/nmi.c         |    6 ++-
 arch/x86/kernel/traps.c       |    8 +++-
 6 files changed, 154 insertions(+), 16 deletions(-)

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