linux-kernel - [PATCH 0/3] [GIT PULL] tracing: Three more updates

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Date:	Sun, 22 May 2016 16:28:46 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	linux-kernel@...r.kernel.org
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 0/3] [GIT PULL] tracing: Three more updates

Linus,

Three more changes.

1) I forgot that I had another selftest to stress test the ftrace
   instance creation. It was actually suppose to go into the 4.6
   merge window, but I never committed it. I almost forgot about it
   again, but noticed it was missing from your tree.

2) Soumya PN sent me a clean up patch to not disable interrupts when
   taking the tasklist_lock for read, as it's unnecessary because
   that lock is never taken for write in irq context.

3) Newer gcc's can cause the jump in the function_graph code to the
   global ftrace_stub label to be a short jump instead of a long one.
   As that jump is dynamically converted to jump to the trace code to
   do function graph tracing, and that conversion expects a long jump
   it can corrupt the ftrace_stub itself (it's directly after that call).
   One way to prevent gcc from using a short jump is to declare the
   ftrace_stub as a weak function, which we do here to keep gcc from
   optimizing too much.

Please pull the latest trace-v4.7-2 tree, which can be found at:

  git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
trace-v4.7-2

Tag SHA1: 01ed489ad3660b3813d93d63b0b9258e08b15f7f
Head SHA1: 8329e818f14926a6040df86b2668568bde342ebf

Soumya PN (1):
      ftrace: Don't disable irqs when taking the tasklist_lock read_lock

Steven Rostedt (1):
      ftrace/x86: Set ftrace_stub to weak to prevent gcc from using short jumps to it

Steven Rostedt (Red Hat) (1):
      ftracetest: Add instance created, delete, read and enable event test

----
 arch/x86/kernel/mcount_64.S                        |   3 +-
 kernel/trace/ftrace.c                              |   5 +-
 .../ftrace/test.d/instances/instance-event.tc      | 143 +++++++++++++++++++++
 3 files changed, 147 insertions(+), 4 deletions(-)
 create mode 100644 tools/testing/selftests/ftrace/test.d/instances/instance-event.tc