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SubjectRe: [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@linux.alibaba.com 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@google.com> # RISC-V

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