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(-)
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