Re: [PATCH 0/2] ftrace: make sure preemption disabled on recursion testing

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On Mon, 11 Oct 2021 22:39:16 PDT (-0700), yun.wang@xxxxxxxxxxxxxxxxx wrote:
The testing show that perf_ftrace_function_call() are using
smp_processor_id() with preemption enabled, all the checking
on CPU could be wrong after preemption, PATCH 1/2 will fix
that.

Besides, as Peter point out, the testing of recursion within
the section between ftrace_test_recursion_trylock()/_unlock()
pair also need the preemption disabled as the documentation
explained, PATCH 2/2 will make sure on that.

Michael Wang (2):
  ftrace: disable preemption on the testing of recursion
  ftrace: prevent preemption in perf_ftrace_function_call()

 arch/csky/kernel/probes/ftrace.c     |  2 --
 arch/parisc/kernel/ftrace.c          |  2 --
 arch/powerpc/kernel/kprobes-ftrace.c |  2 --
 arch/riscv/kernel/probes/ftrace.c    |  2 --
 arch/x86/kernel/kprobes/ftrace.c     |  2 --
 include/linux/trace_recursion.h      | 10 +++++++++-
 kernel/livepatch/patch.c             |  6 ------
 kernel/trace/trace_event_perf.c      | 17 +++++++++++++----
 kernel/trace/trace_functions.c       |  5 -----
 9 files changed, 22 insertions(+), 26 deletions(-)

Acked-by: Palmer Dabbelt <palmerdabbelt@xxxxxxxxxx> # RISC-V



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