linux-kernel - Re: [PATCH 3/3] perf probe: Check -v and -q options in the right place

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Date:   Tue, 20 Dec 2022 13:12:27 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Yang Jihong <yangjihong1@...wei.com>, peterz@...radead.org,
        mingo@...hat.com, acme@...nel.org, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        namhyung@...nel.org, irogers@...gle.com, carsten.haitzler@....com,
        leo.yan@...aro.org, ravi.bangoria@....com, martin.lau@...nel.org,
        ak@...ux.intel.com, masami.hiramatsu.pt@...achi.com,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] perf probe: Check -v and -q options in the right
 place

On 20/12/22 05:57, Yang Jihong wrote:
> Check the -q and -v options first to return earlier on error.
> 
> Before:
>   # perf probe -q -v test
>   probe-definition(0): test
>   symbol:test file:(null) line:0 offset:0 return:0 lazy:(null)
>   0 arguments
>     Error: -v and -q are exclusive.
> 
> After:
>   # perf probe -q -v test
>     Error: -v and -q are exclusive.
> 
> Fixes: 5e17b28f1e24 ("perf probe: Add --quiet option to suppress output result message")
> Signed-off-by: Yang Jihong <yangjihong1@...wei.com>

Reviewed-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  tools/perf/builtin-probe.c | 17 +++++++++--------
>  1 file changed, 9 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
> index 2ae50fc9e597..ed73d0b89ca2 100644
> --- a/tools/perf/builtin-probe.c
> +++ b/tools/perf/builtin-probe.c
> @@ -612,6 +612,15 @@ __cmd_probe(int argc, const char **argv)
>  
>  	argc = parse_options(argc, argv, options, probe_usage,
>  			     PARSE_OPT_STOP_AT_NON_OPTION);
> +
> +	if (quiet) {
> +		if (verbose != 0) {
> +			pr_err("  Error: -v and -q are exclusive.\n");
> +			return -EINVAL;
> +		}
> +		verbose = -1;
> +	}
> +
>  	if (argc > 0) {
>  		if (strcmp(argv[0], "-") == 0) {
>  			usage_with_options_msg(probe_usage, options,
> @@ -633,14 +642,6 @@ __cmd_probe(int argc, const char **argv)
>  	if (ret)
>  		return ret;
>  
> -	if (quiet) {
> -		if (verbose != 0) {
> -			pr_err("  Error: -v and -q are exclusive.\n");
> -			return -EINVAL;
> -		}
> -		verbose = -1;
> -	}
> -
>  	if (probe_conf.max_probes == 0)
>  		probe_conf.max_probes = MAX_PROBES;
>