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    Subject[PATCH 02/21] perf evlist: Remove stale mmap read for backward
    Date
    From: Kan Liang <kan.liang@intel.com>

    perf_evlist__mmap_read_catchup() and perf_evlist__mmap_read_backward()
    are only for overwrite mode.

    But they read the evlist->mmap buffer which is for non-overwrite mode.

    It did not bring any serious problem yet, because there is no one use
    it.

    Remove the unused interfaces.

    Signed-off-by: Kan Liang <kan.liang@intel.com>
    Acked-by: Jiri Olsa <jolsa@kernel.org>
    Acked-by: Wang Nan <wangnan0@huawei.com>
    Cc: Andi Kleen <ak@linux.intel.com>
    Cc: Jin Yao <yao.jin@linux.intel.com>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Link: http://lkml.kernel.org/r/1516310792-208685-2-git-send-email-kan.liang@intel.com
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    ---
    tools/perf/util/evlist.c | 17 -----------------
    tools/perf/util/evlist.h | 4 ----
    2 files changed, 21 deletions(-)

    diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
    index ac35cd214feb..e5fc14e53c05 100644
    --- a/tools/perf/util/evlist.c
    +++ b/tools/perf/util/evlist.c
    @@ -715,28 +715,11 @@ union perf_event *perf_evlist__mmap_read_forward(struct perf_evlist *evlist, int
    return perf_mmap__read_forward(md);
    }

    -union perf_event *perf_evlist__mmap_read_backward(struct perf_evlist *evlist, int idx)
    -{
    - struct perf_mmap *md = &evlist->mmap[idx];
    -
    - /*
    - * No need to check messup for backward ring buffer:
    - * We can always read arbitrary long data from a backward
    - * ring buffer unless we forget to pause it before reading.
    - */
    - return perf_mmap__read_backward(md);
    -}
    -
    union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
    {
    return perf_evlist__mmap_read_forward(evlist, idx);
    }

    -void perf_evlist__mmap_read_catchup(struct perf_evlist *evlist, int idx)
    -{
    - perf_mmap__read_catchup(&evlist->mmap[idx]);
    -}
    -
    void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx)
    {
    perf_mmap__consume(&evlist->mmap[idx], false);
    diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
    index 75f8e0ad5d76..336b838e6957 100644
    --- a/tools/perf/util/evlist.h
    +++ b/tools/perf/util/evlist.h
    @@ -133,10 +133,6 @@ union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx);

    union perf_event *perf_evlist__mmap_read_forward(struct perf_evlist *evlist,
    int idx);
    -union perf_event *perf_evlist__mmap_read_backward(struct perf_evlist *evlist,
    - int idx);
    -void perf_evlist__mmap_read_catchup(struct perf_evlist *evlist, int idx);
    -
    void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx);

    int perf_evlist__open(struct perf_evlist *evlist);
    --
    2.14.3
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