linux-kernel - Re: [PATCH v2 04/26] perf maps: Make delete static, always use put

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Date:   Fri, 9 Jun 2023 11:17:42 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     John Garry <john.g.garry@...cle.com>,
        Will Deacon <will@...nel.org>,
        James Clark <james.clark@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        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>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        German Gomez <german.gomez@....com>,
        Ali Saidi <alisaidi@...zon.com>,
        Jing Zhang <renyu.zj@...ux.alibaba.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        ye xingchen <ye.xingchen@....com.cn>,
        Liam Howlett <liam.howlett@...cle.com>,
        Dmitrii Dolgov <9erthalion6@...il.com>,
        Yang Jihong <yangjihong1@...wei.com>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Changbin Du <changbin.du@...wei.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>,
        "Steinar H. Gunderson" <sesse@...gle.com>,
        Yuan Can <yuancan@...wei.com>,
        Brian Robbins <brianrob@...ux.microsoft.com>,
        liuwenyu <liuwenyu7@...wei.com>,
        Ivan Babrou <ivan@...udflare.com>,
        Fangrui Song <maskray@...gle.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org, coresight@...ts.linaro.org
Subject: Re: [PATCH v2 04/26] perf maps: Make delete static, always use put

Em Thu, Jun 08, 2023 at 04:28:01PM -0700, Ian Rogers escreveu:
> Address/leak sanitizer with reference count checking can identify the
> location of leaks, so use put rather than delete to avoid free-ing
> memory when the reference count is >1. Add maps__zput to ensure the
> variable is cleared.

Applied.

- Arnaldo
 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/tests/maps.c   | 2 +-
>  tools/perf/util/machine.c | 2 +-
>  tools/perf/util/maps.c    | 2 +-
>  tools/perf/util/maps.h    | 9 ++++++++-
>  4 files changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/perf/tests/maps.c b/tools/perf/tests/maps.c
> index 8c0eb5cf8bb5..5bb1123a91a7 100644
> --- a/tools/perf/tests/maps.c
> +++ b/tools/perf/tests/maps.c
> @@ -140,7 +140,7 @@ static int test__maps__merge_in(struct test_suite *t __maybe_unused, int subtest
>  	ret = check_maps(merged3, ARRAY_SIZE(merged3), maps);
>  	TEST_ASSERT_VAL("merge check failed", !ret);
>  
> -	maps__delete(maps);
> +	maps__zput(maps);
>  	return TEST_OK;
>  }
>  
> diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
> index 5d34d60a0045..8972c852d3bd 100644
> --- a/tools/perf/util/machine.c
> +++ b/tools/perf/util/machine.c
> @@ -248,7 +248,7 @@ void machine__exit(struct machine *machine)
>  		return;
>  
>  	machine__destroy_kernel_maps(machine);
> -	maps__delete(machine->kmaps);
> +	maps__zput(machine->kmaps);
>  	dsos__exit(&machine->dsos);
>  	machine__exit_vdso(machine);
>  	zfree(&machine->root_dir);
> diff --git a/tools/perf/util/maps.c b/tools/perf/util/maps.c
> index 5ae6379a1b42..5206a6433117 100644
> --- a/tools/perf/util/maps.c
> +++ b/tools/perf/util/maps.c
> @@ -171,7 +171,7 @@ struct maps *maps__new(struct machine *machine)
>  	return result;
>  }
>  
> -void maps__delete(struct maps *maps)
> +static void maps__delete(struct maps *maps)
>  {
>  	maps__exit(maps);
>  	unwind__finish_access(maps);
> diff --git a/tools/perf/util/maps.h b/tools/perf/util/maps.h
> index d2963456cfbe..83144e0645ed 100644
> --- a/tools/perf/util/maps.h
> +++ b/tools/perf/util/maps.h
> @@ -57,13 +57,20 @@ struct kmap {
>  };
>  
>  struct maps *maps__new(struct machine *machine);
> -void maps__delete(struct maps *maps);
>  bool maps__empty(struct maps *maps);
>  int maps__clone(struct thread *thread, struct maps *parent);
>  
>  struct maps *maps__get(struct maps *maps);
>  void maps__put(struct maps *maps);
>  
> +static inline void __maps__zput(struct maps **map)
> +{
> +	maps__put(*map);
> +	*map = NULL;
> +}
> +
> +#define maps__zput(map) __maps__zput(&map)
> +
>  static inline struct rb_root *maps__entries(struct maps *maps)
>  {
>  	return &RC_CHK_ACCESS(maps)->entries;
> -- 
> 2.41.0.162.gfafddb0af9-goog
> 

-- 

- Arnaldo