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

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Date:   Wed, 8 Jun 2022 08:20:28 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] samples: Use KSYM_NAME_LEN for fprobe and kprobes



On 06/08/2022 12:17 AM, Masami Hiramatsu (Google) wrote:
> On Tue,  7 Jun 2022 17:35:36 +0800
> Tiezhu Yang <yangtiezhu@...ngson.cn> wrote:
>
>> It is better and enough to use KSYM_NAME_LEN for fprobe and kprobes
>> in samples, no need to define and use the other values.
>>
>
> This is good for kprobe and kretprobe examples because it will get
> a single symbol name, but not good for the fprobe. It can take
> several comma separated symbols.
>
> -----
> static int __init fprobe_init(void)
> {
> ...
>         /* Comma separated symbols */
>         symbuf = kstrdup(symbol, GFP_KERNEL);
>         if (!symbuf)
>                 return -ENOMEM;
>         p = symbuf;
>         count = 1;
>         while ((p = strchr(++p, ',')) != NULL)
>                 count++;
>
>         pr_info("%d symbols found\n", count);
> -----
>
> Can you drop the fprobe_example.c part?
>

OK, I will send v2 later, thank you.

Thanks,
Tiezhu