linux-kernel - Re: [PATCH] tracing/kprobes: Fix the description of variable length arguments

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Message-Id: <20231027221833.5f2c6d46dfd51110aafe6f58@kernel.org>
Date:   Fri, 27 Oct 2023 22:18:33 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     Mukesh Ojha <quic_mojha@...cinc.com>
Cc:     Yujie Liu <yujie.liu@...el.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Tom Zanussi <zanussi@...nel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-trace-kernel@...r.kernel.org>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] tracing/kprobes: Fix the description of variable length
 arguments

On Fri, 27 Oct 2023 14:10:44 +0530
Mukesh Ojha <quic_mojha@...cinc.com> wrote:

> 
> 
> On 10/27/2023 9:43 AM, Yujie Liu wrote:
> > Fix the following kernel-doc warnings:
> > 
> > kernel/trace/trace_kprobe.c:1029: warning: Excess function parameter 'args' description in '__kprobe_event_gen_cmd_start'
> > kernel/trace/trace_kprobe.c:1097: warning: Excess function parameter 'args' description in '__kprobe_event_add_fields'
> > 
> > Refer to the usage of variable length arguments elsewhere in the kernel
> > code, "@..." is the proper way to express it in the description.
> > 
> > Fixes: 2a588dd1d5d6 ("tracing: Add kprobe event command generation functions")
> > Reported-by: kernel test robot <lkp@...el.com>
> > Closes: https://lore.kernel.org/oe-kbuild-all/202310190437.paI6LYJF-lkp@intel.com/
> > Signed-off-by: Yujie Liu <yujie.liu@...el.com>
> 
> Not related to this patch, but I see order of the argument as well is 
> not proper in the document of the __kprobe_event_gen_cmd_start(),
> if you can fix that too.
> 
> LGTM, Thanks for this.
> Reviewed-by: Mukesh Ojha <quic_mojha@...cinc.com>

Thanks! let me pick this!

> 
> -Mukesh
> 
> > ---
> >   kernel/trace/trace_kprobe.c | 4 ++--
> >   1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> > index a8fef6ab0872..95c5b0668cb7 100644
> > --- a/kernel/trace/trace_kprobe.c
> > +++ b/kernel/trace/trace_kprobe.c
> > @@ -1007,7 +1007,7 @@ EXPORT_SYMBOL_GPL(kprobe_event_cmd_init);
> >    * @name: The name of the kprobe event
> >    * @loc: The location of the kprobe event
> >    * @kretprobe: Is this a return probe?
> > - * @args: Variable number of arg (pairs), one pair for each field
> > + * @...: Variable number of arg (pairs), one pair for each field
> >    *
> >    * NOTE: Users normally won't want to call this function directly, but
> >    * rather use the kprobe_event_gen_cmd_start() wrapper, which automatically
> > @@ -1080,7 +1080,7 @@ EXPORT_SYMBOL_GPL(__kprobe_event_gen_cmd_start);
> >   /**
> >    * __kprobe_event_add_fields - Add probe fields to a kprobe command from arg list
> >    * @cmd: A pointer to the dynevent_cmd struct representing the new event
> > - * @args: Variable number of arg (pairs), one pair for each field
> > + * @...: Variable number of arg (pairs), one pair for each field
> >    *
> >    * NOTE: Users normally won't want to call this function directly, but
> >    * rather use the kprobe_event_add_fields() wrapper, which


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