linux-kernel - Re: [PATCH] tracing/eprobe: drop unneeded breaks

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Date:   Sat, 30 Sep 2023 18:19:02 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     Julia Lawall <julia.lawall@...ia.fr>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH] tracing/eprobe: drop unneeded breaks

On Fri, 29 Sep 2023 13:37:08 +0200 (CEST)
Julia Lawall <julia.lawall@...ia.fr> wrote:

> 
> 
> On Fri, 29 Sep 2023, Masami Hiramatsu  wrote:
> 
> > On Thu, 28 Sep 2023 12:43:34 +0200
> > Julia Lawall <Julia.Lawall@...ia.fr> wrote:
> >
> > > Drop break after return.
> > >
> >
> > Good catch! This looks good to me.
> >
> > Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> >
> > And
> >
> > Fixes: 7491e2c44278 ("tracing: Add a probe that attaches to trace events")
> 
> Thanks.  I didn't include that because it's not a bug.  But it does break
> Coccinelle, which is how I noticed it.

OK, I got it. I thought it may cause a compiler warning because the
'break' never be executed. (maybe it is just a flow-control word,
so it may not need to be warned, but a bit storange.)

> 
> julia
> 
> >
> > > Signed-off-by: Julia Lawall <Julia.Lawall@...ia.fr>
> > >
> > > ---
> > >  kernel/trace/trace_eprobe.c |    5 +----
> > >  1 file changed, 1 insertion(+), 4 deletions(-)
> > >
> > > diff --git a/kernel/trace/trace_eprobe.c b/kernel/trace/trace_eprobe.c
> > > index 72714cbf475c..03c851f57969 100644
> > > --- a/kernel/trace/trace_eprobe.c
> > > +++ b/kernel/trace/trace_eprobe.c
> > > @@ -788,12 +788,9 @@ find_and_get_event(const char *system, const char *event_name)
> > >  		name = trace_event_name(tp_event);
> > >  		if (!name || strcmp(event_name, name))
> > >  			continue;
> > > -		if (!trace_event_try_get_ref(tp_event)) {
> > > +		if (!trace_event_try_get_ref(tp_event))
> > >  			return NULL;
> > > -			break;
> > > -		}
> > >  		return tp_event;
> > > -		break;
> > >  	}
> > >  	return NULL;
> > >  }
> > >
> >
> >
> > --
> > Masami Hiramatsu (Google) <mhiramat@...nel.org>
> >


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