linux-kernel - Re: [PATCH v3 06/22] perf test: Use pointer for maps

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Date:   Mon, 14 Feb 2022 16:50:40 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     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@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Darren Hart <dvhart@...radead.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        André Almeida <andrealmeid@...labora.com>,
        James Clark <james.clark@....com>,
        John Garry <john.garry@...wei.com>,
        Riccardo Mancini <rickyman7@...il.com>,
        Yury Norov <yury.norov@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Leo Yan <leo.yan@...aro.org>, Andi Kleen <ak@...ux.intel.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Shunsuke Nakamura <nakamura.shun@...itsu.com>,
        Song Liu <song@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Miaoqian Lin <linmq006@...il.com>,
        Stephen Brennan <stephen.s.brennan@...cle.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        German Gomez <german.gomez@....com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Hao Luo <haoluo@...gle.com>, eranian@...gle.com
Subject: Re: [PATCH v3 06/22] perf test: Use pointer for maps

Em Mon, Feb 14, 2022 at 04:48:35PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Fri, Feb 11, 2022 at 02:33:59AM -0800, Ian Rogers escreveu:
> > struct maps is reference counted, using a pointer is more idiomatic.
> > 
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > ---
> >  tools/perf/tests/maps.c | 20 ++++++++++----------
> >  1 file changed, 10 insertions(+), 10 deletions(-)
> > 
> > diff --git a/tools/perf/tests/maps.c b/tools/perf/tests/maps.c
> > index e308a3296cef..6f53f17f788e 100644
> > --- a/tools/perf/tests/maps.c
> > +++ b/tools/perf/tests/maps.c
> > @@ -35,7 +35,7 @@ static int check_maps(struct map_def *merged, unsigned int size, struct maps *ma
> >  
> >  static int test__maps__merge_in(struct test_suite *t __maybe_unused, int subtest __maybe_unused)
> >  {
> > -	struct maps maps;
> > +	struct maps *maps;
> >  	unsigned int i;
> >  	struct map_def bpf_progs[] = {
> >  		{ "bpf_prog_1", 200, 300 },
> > @@ -64,7 +64,7 @@ static int test__maps__merge_in(struct test_suite *t __maybe_unused, int subtest
> >  	struct map *map_kcore1, *map_kcore2, *map_kcore3;
> >  	int ret;
> >  
> > -	maps__init(&maps, NULL);
> > +	maps = maps__new(NULL);
> 
> Now that is dynamicly allocated we need to check for the constructor
> result, I'm fixing this up.

I.e. added this:

diff --git a/tools/perf/tests/maps.c b/tools/perf/tests/maps.c
index 6f53f17f788e7dd7..a69988a89d265211 100644
--- a/tools/perf/tests/maps.c
+++ b/tools/perf/tests/maps.c
@@ -35,7 +35,6 @@ static int check_maps(struct map_def *merged, unsigned int size, struct maps *ma
 
 static int test__maps__merge_in(struct test_suite *t __maybe_unused, int subtest __maybe_unused)
 {
-	struct maps *maps;
 	unsigned int i;
 	struct map_def bpf_progs[] = {
 		{ "bpf_prog_1", 200, 300 },
@@ -63,8 +62,9 @@ static int test__maps__merge_in(struct test_suite *t __maybe_unused, int subtest
 	};
 	struct map *map_kcore1, *map_kcore2, *map_kcore3;
 	int ret;
+	struct maps *maps = maps__new(NULL);
 
-	maps = maps__new(NULL);
+	TEST_ASSERT_VAL("failed to create maps", maps);
 
 	for (i = 0; i < ARRAY_SIZE(bpf_progs); i++) {
 		struct map *map;