linux-kernel - Re: [PATCH v2] kretprobe: avoid re-registration of the same kretprobe earlier

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Date:   Fri, 29 Jan 2021 11:28:49 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
Cc:     Wang ShaoBo <bobo.shaobowang@...wei.com>, cj.chengjian@...wei.com,
        huawei.libin@...wei.com, xiexiuqi@...wei.com,
        naveen.n.rao@...ux.ibm.com, anil.s.keshavamurthy@...el.com,
        davem@...emloft.net, linux-kernel@...r.kernel.org,
        ananth@...ux.ibm.com
Subject: Re: [PATCH v2] kretprobe: avoid re-registration of the same
 kretprobe earlier

On Fri, 29 Jan 2021 15:23:47 +0530
"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com> wrote:

> diff --git a/kernel/kprobes.c b/kernel/kprobes.c
> index f7fb5d135930fa..63a36f33565354 100644
> --- a/kernel/kprobes.c
> +++ b/kernel/kprobes.c
> @@ -1530,6 +1530,7 @@ static inline int check_kprobe_rereg(struct kprobe *p)
>                 ret = -EINVAL;
>         mutex_unlock(&kprobe_mutex);
> 
> +       WARN_ON(ret);
>         return ret;
>  }

Please use WARN_ON_ONCE(ret);

Thanks,

-- Steve