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SubjectRe: [PATCH 3/3] arm64/kprobe: Optimize the performance of patching single-step slot
On Tue, Sep 27, 2022 at 10:24:35AM +0800, Liao Chang wrote:
> Single-step slot would not be used until kprobe is enabled, that means
> no race condition occurs on it under SMP, hence it is safe to pacth ss
> slot without stopping machine.
>
> Since I and D caches are coherent within single-step slot from
> aarch64_insn_patch_text_nosync(), hence no need to do it again via
> flush_icache_range().
>
> Acked-by: Will Deacon <will@kernel.org>
> Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
> Signed-off-by: Liao Chang <liaochang1@huawei.com>
> ---
> arch/arm64/kernel/probes/kprobes.c | 27 +++++++++++++++++++++------
> 1 file changed, 21 insertions(+), 6 deletions(-)

What's your expectation with this series, should the arch maintainers
just pick the individual patches?

--
Catalin

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