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

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Date:   Thu, 9 Dec 2021 21:15:04 +0100
From:   Salvatore Bonaccorso <carnil@...ian.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        German Gomez <german.gomez@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        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,

On Thu, Dec 09, 2021 at 04:20:22PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Wed, Dec 08, 2021 at 12:11:59PM +0100, Salvatore Bonaccorso escreveu:
> > 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;
> >       |
> > 
> 
> So I'm applying this, its an obvious cleanup, but please CC the author
> next time, I'm doing it in this reply, Adrian, ok?

Yes right, I apologies for that, something went wrong when I generated
the list of people to contact using 

./scripts/get_maintainer.pl ./tools/perf/dlfilters/dlfilter-test-api-v0.c

and write up the persons to contact.

Thank you!

Regards,
Salvatore