netdev - Re: [PATCH v3] ftrace: Add FTRACE_MCOUNT_MAX_OFFSET to avoid adding weak functions

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Date:   Thu, 26 May 2022 10:44:30 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     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>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org
Subject: Re: [PATCH v3] ftrace: Add FTRACE_MCOUNT_MAX_OFFSET to avoid adding
 weak functions

On Thu, 26 May 2022 10:38:10 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> +++ b/arch/x86/include/asm/ftrace.h
> @@ -9,6 +9,11 @@
>  # define MCOUNT_ADDR		((unsigned long)(__fentry__))
>  #define MCOUNT_INSN_SIZE	5 /* sizeof mcount call */
>  
> +/* Ignore unused weak functions which will have non zero offsets */
> +#ifdef CONFIG_HAVE_FENTRY
> +# define FTRACE_MCOUNT_MAX_OFFSET	0
> +#endif
> +

I screwed up this patch. Please ignore.

And Peter just informed me that IBT is in 5.18 already, and not 5.19. So,
I'll add his suggestion in v4.

-- Steve