linux-kernel - Re: [PATCH v2 4/5] LoongArch: ftrace: Add direct call trampoline samples support

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Message-ID: <20230523103438.7be15275@rorschach.local.home>
Date:   Tue, 23 May 2023 10:34:38 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Youling Tang <tangyouling@...ngson.cn>
Cc:     Huacai Chen <chenhuacai@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        WANG Xuerui <kernel@...0n.name>, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, loongarch@...ts.linux.dev,
        loongson-kernel@...ts.loongnix.cn,
        Qing Zhang <zhangqing@...ngson.cn>
Subject: Re: [PATCH v2 4/5] LoongArch: ftrace: Add direct call trampoline
 samples support

On Thu, 27 Apr 2023 10:12:31 +0800
Youling Tang <tangyouling@...ngson.cn> wrote:

> The ftrace samples need per-architecture trampoline implementations
> to save and restore argument registers around the calls to
> my_direct_func* and to restore polluted registers (eg: ra).
> 
> Signed-off-by: Qing Zhang <zhangqing@...ngson.cn>
> Signed-off-by: Youling Tang <tangyouling@...ngson.cn>
> ---
>  arch/loongarch/Kconfig                      |  2 +
>  samples/ftrace/ftrace-direct-modify.c       | 34 +++++++++++++++++
>  samples/ftrace/ftrace-direct-multi-modify.c | 41 +++++++++++++++++++++
>  samples/ftrace/ftrace-direct-multi.c        | 25 +++++++++++++
>  samples/ftrace/ftrace-direct-too.c          | 27 ++++++++++++++
>  samples/ftrace/ftrace-direct.c              | 23 ++++++++++++
>  6 files changed, 152 insertions(+)

Acked-by: Steven Rostedt (Google) <rostedt@...dmis.org>

-- Steve