linux-kernel - Re: [PATCH] trace/kprobe: remove MAX_KPROBE_CMDLINE

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Message-ID: <20200121183438.635b0ff7@gandalf.local.home>
Date:   Tue, 21 Jan 2020 18:34:38 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Alex Shi <alex.shi@...ux.alibaba.com>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] trace/kprobe: remove MAX_KPROBE_CMDLINE_SIZE

Masami,

With your new bootconfig work, will you be utilizing
MAX_KPROBE_CMDLINE_SIZE, or should it be removed?

-- Steve


On Tue, 21 Jan 2020 13:54:35 +0800
Alex Shi <alex.shi@...ux.alibaba.com> wrote:

> This limitation are never lunched from introduce commit 970988e19eb0
> ("tracing/kprobe: Add kprobe_event= boot parameter")
> 
> Could we remove it if no intention to implement it?
> 
> Signed-off-by: Alex Shi <alex.shi@...ux.alibaba.com>
> Cc: Steven Rostedt <rostedt@...dmis.org> 
> Cc: Ingo Molnar <mingo@...hat.com> 
> Cc: linux-kernel@...r.kernel.org 
> ---
>  kernel/trace/trace_kprobe.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> index 7f890262c8a3..eafa90d0f760 100644
> --- a/kernel/trace/trace_kprobe.c
> +++ b/kernel/trace/trace_kprobe.c
> @@ -22,7 +22,6 @@
>  
>  #define KPROBE_EVENT_SYSTEM "kprobes"
>  #define KRETPROBE_MAXACTIVE_MAX 4096
> -#define MAX_KPROBE_CMDLINE_SIZE 1024
>  
>  /* Kprobe early definition from command line */
>  static char kprobe_boot_events_buf[COMMAND_LINE_SIZE] __initdata;