linux-kernel - Re: [FYI PATCH 1/1] perf tools: Update copy of libbpf's hashmap.c

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Date:   Tue, 29 Mar 2022 09:25:27 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Mauricio Vásquez <mauricio@...volk.io>,
        Andrii Nakryiko <andrii@...nel.org>,
        Ian Rogers <irogers@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [FYI PATCH 1/1] perf tools: Update copy of libbpf's hashmap.c

On Tue, Mar 29, 2022 at 7:46 AM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
>
> Just FYI, I'm carrying this patch in the perf tools tree.
>

Cool. I have some tentative plans to do some more changes to hashmap
for improved API usability and performance, so you might need to pull
a few more patches in the near future.

> - Arnaldo
>
> ---
>
> To pick the changes in:
>
>   fba60b171a032283 ("libbpf: Use IS_ERR_OR_NULL() in hashmap__free()")
>
> That don't entail any changes in tools/perf.
>
> This addresses this perf build warning:
>
>   Warning: Kernel ABI header at 'tools/perf/util/hashmap.h' differs from latest version at 'tools/lib/bpf/hashmap.h'
>   diff -u tools/perf/util/hashmap.h tools/lib/bpf/hashmap.h
>
> Not a kernel ABI, its just that this uses the mechanism in place for
> checking kernel ABI files drift.
>
> Cc: Andrii Nakryiko <andrii@...nel.org>
> Cc: Ian Rogers <irogers@...gle.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Mauricio Vásquez <mauricio@...volk.io>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
>  tools/perf/util/hashmap.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/hashmap.c b/tools/perf/util/hashmap.c
> index 3c20b126d60d869a..aeb09c2887162d16 100644
> --- a/tools/perf/util/hashmap.c
> +++ b/tools/perf/util/hashmap.c
> @@ -75,7 +75,7 @@ void hashmap__clear(struct hashmap *map)
>
>  void hashmap__free(struct hashmap *map)
>  {
> -       if (!map)
> +       if (IS_ERR_OR_NULL(map))
>                 return;
>
>         hashmap__clear(map);
> @@ -238,4 +238,3 @@ bool hashmap__delete(struct hashmap *map, const void *key,
>
>         return true;
>  }
> -
> --
> 2.35.1
>