linux-kernel - Re: : [PATCH] ftrace/x86: Add FTRACE_MCOUNT_MAX

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Date:   Sat, 7 May 2022 09:53:04 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>, x86@...nel.org
Subject: Re: : [PATCH] ftrace/x86: Add FTRACE_MCOUNT_MAX_OFFSET to avoid
 adding weak functions

On Fri, 6 May 2022 21:38:29 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> You forgot about IBT again? __fentry__ no longer lives at +0 on x86
> anymore.

I didn't forget. It was that the kernel I wrote this for didn't have it ;-)

I wasn't sure if it was accepted into mainline yet.

-- Steve