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Date:   Fri, 15 May 2020 12:41:49 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Ian Rogers <irogers@...gle.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>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Andi Kleen <ak@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Kim Phillips <kim.phillips@....com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Leo Yan <leo.yan@...aro.org>,
        open list <linux-kernel@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v2 4/7] tools lib/api: Copy libbpf hashmap to tools/perf/util

On Fri, May 15, 2020 at 9:50 AM Ian Rogers <irogers@...gle.com> wrote:
>
> Allow use of hashmap in perf. Modify perf's check-headers.sh script to
> check that the files are kept in sync, in the same way kernel headers are
> checked. This will warn if they are out of sync at the start of a perf
> build.
>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---

Given you want to make sure they stay 1 to 1, would just creating a
symlink work instead of copying the code?

Either way, I think hashmap is stable and not going to change
frequently, so whichever way is fine with me.

Acked-by: Andrii Nakryiko <andriin@...com>

>  tools/perf/check-headers.sh |   4 +
>  tools/perf/util/Build       |   4 +
>  tools/perf/util/hashmap.c   | 238 ++++++++++++++++++++++++++++++++++++
>  tools/perf/util/hashmap.h   | 177 +++++++++++++++++++++++++++
>  4 files changed, 423 insertions(+)
>  create mode 100644 tools/perf/util/hashmap.c
>  create mode 100644 tools/perf/util/hashmap.h
>

[...]

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