linux-kernel - Re: [PATCH v2] samples: Use KSYM_NAME

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Message-Id: <20220622110659.74a269678bc7c37e15cdebaf@kernel.org>
Date:   Wed, 22 Jun 2022 11:06:59 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] samples: Use KSYM_NAME_LEN for kprobes

Hi,

On Wed,  8 Jun 2022 09:23:22 +0800
Tiezhu Yang <yangtiezhu@...ngson.cn> wrote:

> It is better and enough to use KSYM_NAME_LEN for kprobes
> in samples, no need to define and use the other values.

This looks good to me.

Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Thank you!

> 
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
> ---
>  samples/kprobes/kprobe_example.c    | 5 ++---
>  samples/kprobes/kretprobe_example.c | 5 ++---
>  2 files changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/samples/kprobes/kprobe_example.c b/samples/kprobes/kprobe_example.c
> index f991a66..fd346f5 100644
> --- a/samples/kprobes/kprobe_example.c
> +++ b/samples/kprobes/kprobe_example.c
> @@ -16,9 +16,8 @@
>  #include <linux/module.h>
>  #include <linux/kprobes.h>
>  
> -#define MAX_SYMBOL_LEN	64
> -static char symbol[MAX_SYMBOL_LEN] = "kernel_clone";
> -module_param_string(symbol, symbol, sizeof(symbol), 0644);
> +static char symbol[KSYM_NAME_LEN] = "kernel_clone";
> +module_param_string(symbol, symbol, KSYM_NAME_LEN, 0644);
>  
>  /* For each probe you need to allocate a kprobe structure */
>  static struct kprobe kp = {
> diff --git a/samples/kprobes/kretprobe_example.c b/samples/kprobes/kretprobe_example.c
> index 228321e..cbf1654 100644
> --- a/samples/kprobes/kretprobe_example.c
> +++ b/samples/kprobes/kretprobe_example.c
> @@ -23,11 +23,10 @@
>  #include <linux/module.h>
>  #include <linux/kprobes.h>
>  #include <linux/ktime.h>
> -#include <linux/limits.h>
>  #include <linux/sched.h>
>  
> -static char func_name[NAME_MAX] = "kernel_clone";
> -module_param_string(func, func_name, NAME_MAX, S_IRUGO);
> +static char func_name[KSYM_NAME_LEN] = "kernel_clone";
> +module_param_string(func, func_name, KSYM_NAME_LEN, 0644);
>  MODULE_PARM_DESC(func, "Function to kretprobe; this module will report the"
>  			" function's execution time");
>  
> -- 
> 2.1.0
> 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>