linux-kernel - Re: [PATCH] perf dlfilter: Drop unused variable

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Date:   Wed, 8 Dec 2021 10:44:01 +0000
From:   German Gomez <german.gomez@....com>
To:     Salvatore Bonaccorso <carnil@...ian.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>
Cc:     linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf dlfilter: Drop unused variable


On 23/11/2021 21:18, Salvatore Bonaccorso wrote:
> Compiling tools/perf/dlfilters/dlfilter-test-api-v0.c result in:
>
> 	checking for stdlib.h... dlfilters/dlfilter-test-api-v0.c: In function ‘filter_event’:
> 	dlfilters/dlfilter-test-api-v0.c:311:29: warning: unused variable ‘d’ [-Wunused-variable]
> 	  311 |         struct filter_data *d = data;
> 	      |

Did you get this warning when issuing "make"? From my side, it generated
this gcc command so I didn't get it (make DEBUG=1):

  gcc -c -Iinclude  -o dlfilters/dlfilter-test-api-v0.o -fpic dlfilters/dlfilter-test-api-v0.c

Reviewed-by: German Gomez <german.gomez@....com>

Thanks,
German

>
> So remove the  variable now.
>
> Signed-off-by: Salvatore Bonaccorso <carnil@...ian.org>
> ---
>  tools/perf/dlfilters/dlfilter-test-api-v0.c | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/tools/perf/dlfilters/dlfilter-test-api-v0.c b/tools/perf/dlfilters/dlfilter-test-api-v0.c
> index 7565a1852c74..b17eb52a0694 100644
> --- a/tools/perf/dlfilters/dlfilter-test-api-v0.c
> +++ b/tools/perf/dlfilters/dlfilter-test-api-v0.c
> @@ -308,8 +308,6 @@ int filter_event_early(void *data, const struct perf_dlfilter_sample *sample, vo
>  
>  int filter_event(void *data, const struct perf_dlfilter_sample *sample, void *ctx)
>  {
> -	struct filter_data *d = data;
> -
>  	pr_debug("%s API\n", __func__);
>  
>  	return do_checks(data, sample, ctx, false);