Messages in this thread | | | From | KP Singh <> | Date | Mon, 23 May 2022 03:39:57 +0200 | Subject | Re: [PATCH bpf-next v5 1/6] arm64: ftrace: Add ftrace direct call support |
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On Wed, May 18, 2022 at 3:53 PM Xu Kuohai <xukuohai@huawei.com> wrote: > > Add ftrace direct support for arm64. > > 1. When there is custom trampoline only, replace the fentry nop to a > jump instruction that jumps directly to the custom trampoline. > > 2. When ftrace trampoline and custom trampoline coexist, jump from > fentry to ftrace trampoline first, then jump to custom trampoline > when ftrace trampoline exits. The current unused register > pt_regs->orig_x0 is used as an intermediary for jumping from ftrace > trampoline to custom trampoline. > > Signed-off-by: Xu Kuohai <xukuohai@huawei.com> > Acked-by: Song Liu <songliubraving@fb.com>
Acked-by: KP Singh <kpsingh@kernel.org>
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