linux-kernel - Re: [PATCH v2 1/5] perf-probe: Add warning message if there is unexpected event name

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Date:   Thu, 7 Dec 2017 12:53:43 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     bhargavb <bhargavaramudu@...il.com>, linux-kernel@...r.kernel.org,
        Paul Clarke <pc@...ibm.com>,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>,
        linux-rt-users@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v2 1/5] perf-probe: Add warning message if there is
 unexpected event name

Em Thu, Dec 07, 2017 at 04:19:45PM +0900, Masami Hiramatsu escreveu:
> This improve the error message so that user can know
> event-name error before writing new events to
> kprobe-events interface.
> 
> E.g.
>    ======
>    #./perf probe -x /lib64/libc-2.25.so malloc_get_state*
>    Internal error: "malloc_get_state@...BC_2" is wrong event name.

I'm changing this to:

Internal error: "malloc_get_state@...BC_2" is an invalid event name for the /sys/kernel/debug/tracing/kprobe_events interface.

Ok?

- Arnaldo

>      Error: Failed to add events.
>    ======
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> ---
>  tools/perf/util/probe-event.c |    8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index b7aaf9b2294d..c0067950e56f 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -2625,6 +2625,14 @@ static int get_new_event_name(char *buf, size_t len, const char *base,
>  
>  out:
>  	free(nbase);
> +
> +	/* Final validation */
> +	if (ret >= 0 && !is_c_func_name(buf)) {
> +		pr_warning("Internal error: \"%s\" is wrong event name.\n",
> +			   buf);
> +		ret = -EINVAL;
> +	}
> +
>  	return ret;
>  }
>