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

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Date:   Wed, 8 Dec 2021 12:11:59 +0100
From:   Salvatore Bonaccorso <carnil@...ian.org>
To:     German Gomez <german.gomez@....com>
Cc:     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>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf dlfilter: Drop unused variable

Hi German,

On Wed, Dec 08, 2021 at 10:44:01AM +0000, German Gomez wrote:
> 
> 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>

Only when passing -Wall (this is the case when building the kernel packages in
Debian with additional flags, so this is why this was spotted):

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

Regards,
Salvatore