Subject: [PATCH 0/3][RFC] powerpc/ftrace: Removal of stop machine (and other goodies)

From: Steven Rostedt <[email-masked]>
Date: Thu, 26 Apr 2012 14:31:16 -0400

Benjamin,

You once told me on IRC that powerpc has no problem with modifying
code on one CPU that may be executing on another CPU. With the tests I
made on my PPC64 (2 CPUs) box, it seems to be the case.

The first patch removes stop_machine from powerpc. The other patches
add some error handling if ftrace detects an update didn't occur
with 'patch_instruction'.

This is just an RFC, but if it's fine, feel free to pull them into
your tree.

-- Steve

Steven Rostedt (3):
      ftrace/ppc: Have PPC skip updating with stop_machine()
      powerpc: Have patch_instruction detect faults
      ftrace/ppc: Use patch_instruction instead of probe_kernel_write()

----
 arch/powerpc/include/asm/code-patching.h |    4 +-
 arch/powerpc/kernel/ftrace.c             |   69 ++++++++++++++++++++++++------
 arch/powerpc/lib/code-patching.c         |   14 ++++--
 3 files changed, 68 insertions(+), 19 deletions(-)