linux-kernel - Re: [RFC PATCH -next v2 3/4] arm64/ftrace: support dynamically allocated trampolines

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Message-ID: <20220512095010.7b34fc78@gandalf.local.home>
Date:   Thu, 12 May 2022 09:50:10 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Wang ShaoBo <bobo.shaobowang@...wei.com>,
        cj.chengjian@...wei.com, huawei.libin@...wei.com,
        xiexiuqi@...wei.com, liwei391@...wei.com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        catalin.marinas@....com, will@...nel.org, zengshun.wu@...look.com,
        Jiri Olsa <jolsa@...nel.org>
Subject: Re: [RFC PATCH -next v2 3/4] arm64/ftrace: support dynamically
 allocated trampolines

On Thu, 12 May 2022 21:02:31 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> BTW, "what register is saved" can be determined statically, thus I think
> we just need the offset for checking (for fprobe usecase, since it will
> set the ftrace_ops flag by itself.)

I'm not against that API, but I guess it would be useful to see how it
would be used.

-- Steve