linux-kernel - Re: kernel/trace/trace_kprobe.c:952: warning: Excess function parameter 'args' description in '__kprobe_event_gen_cmd

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Message-ID: <20231019092207.7d2fa545@gandalf.local.home>
Date:   Thu, 19 Oct 2023 09:22:07 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Tom Zanussi <zanussi@...nel.org>, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: kernel/trace/trace_kprobe.c:952: warning: Excess function
 parameter 'args' description in '__kprobe_event_gen_cmd_start'

On Thu, 19 Oct 2023 04:33:41 +0800
kernel test robot <lkp@...el.com> wrote:

> All warnings (new ones prefixed by >>):
> 
> >> kernel/trace/trace_kprobe.c:952: warning: Excess function parameter 'args' description in '__kprobe_event_gen_cmd_start'
> >> kernel/trace/trace_kprobe.c:1017: warning: Excess function parameter 'args' description in '__kprobe_event_add_fields'  
> 
> 
> vim +952 kernel/trace/trace_kprobe.c
> 
>    929	
>    930	/**
>    931	 * __kprobe_event_gen_cmd_start - Generate a kprobe event command from arg list
>    932	 * @cmd: A pointer to the dynevent_cmd struct representing the new event
>    933	 * @name: The name of the kprobe event
>    934	 * @loc: The location of the kprobe event
>    935	 * @kretprobe: Is this a return probe?
>    936	 * @args: Variable number of arg (pairs), one pair for each field
>    937	 *
>    938	 * NOTE: Users normally won't want to call this function directly, but
>    939	 * rather use the kprobe_event_gen_cmd_start() wrapper, which automatically
>    940	 * adds a NULL to the end of the arg list.  If this function is used
>    941	 * directly, make sure the last arg in the variable arg list is NULL.
>    942	 *
>    943	 * Generate a kprobe event command to be executed by
>    944	 * kprobe_event_gen_cmd_end().  This function can be used to generate the
>    945	 * complete command or only the first part of it; in the latter case,
>    946	 * kprobe_event_add_fields() can be used to add more fields following this.
>    947	 *
>    948	 * Return: 0 if successful, error otherwise.
>    949	 */
>    950	int __kprobe_event_gen_cmd_start(struct dynevent_cmd *cmd, bool kretprobe,
>    951					 const char *name, const char *loc, ...)
>  > 952	{  

So what is the proper kerneldoc way to express variable length arguments?

-- Steve