linux-kernel - [PATCH 0/4] tracing: Have tracepoint reg functions allowed to fail

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Message-Id: <20161129145657.483474913@goodmis.org>
Date:   Tue, 29 Nov 2016 09:56:57 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH 0/4] tracing: Have tracepoint reg functions allowed to fail

I added a 'trace_event=*:*' to my command line and it crashed the system.
The reason was because it enabled the tracepoint benchmark which has
a reg function that creates a thread. But the kernel command line
tracepoint enabling is done before the scheduler is set up, and thus
the creation of a thread killed the kernel.

But then I noticed that there's no way for the reg to tell the calling
function that it failed to set up. I changed that so that it can fail
and notify the users that the tracepoint did not get enabled due to
a failure.

  git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
ftrace/core

Head SHA1: 9d08cef4a375e171008ed3a041e930aae20cc940


Steven Rostedt (Red Hat) (4):
      tracing: Have the reg function allow to fail
      tracing: Do not start benchmark on boot up
      tracing: Have system enable return error if one of the events fail
      tracing: Allow benchmark to be enabled at early_initcall()

----
 arch/powerpc/include/asm/trace.h                  |  4 ++--
 arch/powerpc/platforms/powernv/opal-tracepoints.c |  6 ++++--
 arch/powerpc/platforms/pseries/lpar.c             |  6 ++++--
 arch/x86/include/asm/trace/exceptions.h           |  2 +-
 arch/x86/include/asm/trace/irq_vectors.h          |  2 +-
 arch/x86/kernel/tracepoint.c                      |  3 ++-
 drivers/i2c/i2c-core.c                            |  3 ++-
 include/linux/tracepoint-defs.h                   |  2 +-
 include/linux/tracepoint.h                        |  2 +-
 include/trace/events/i2c.h                        |  2 +-
 kernel/trace/trace_benchmark.c                    | 26 +++++++++++++++++++++--
 kernel/trace/trace_benchmark.h                    |  2 +-
 kernel/trace/trace_events.c                       | 13 ++++++++++--
 kernel/tracepoint.c                               | 12 ++++++++---
 samples/trace_events/trace-events-sample.c        |  3 ++-
 samples/trace_events/trace-events-sample.h        |  2 +-
 16 files changed, 67 insertions(+), 23 deletions(-)